                  IN THE SUPREME COURT OF TENNESSEE
                             AT NASHVILLE1
                               September 30, 2015 Session

           STATE OF TENNESSEE v. LINZEY DANIELLE SMITH

                     Appeal from the Court of Criminal Appeals
                         Circuit Court for Williamson County
                   No. II-CR077410      James G. Martin, III, Judge


               No. M2013-02818-SC-R11-CD – Filed February 11, 2016


We granted permission to appeal in this case to determine whether the traffic stop of the
Defendant, Linzey Danielle Smith, violated the constitutional rights of the Defendant.
The arresting officer initiated the stop after observing the Defendant once cross and twice
touch the fog line marking the outer right lane boundary on an interstate highway. After
being pulled over, the Defendant was charged with alternative counts of driving under the
influence. The Defendant filed a motion to suppress, contending that the traffic stop was
unconstitutional. After a hearing, the trial court denied the motion to suppress. The
Defendant then pleaded guilty to driving under the influence and reserved a certified
question of law regarding the legality of her traffic stop. The Court of Criminal Appeals
affirmed the judgment. We hold that the traffic stop was supported by reasonable
suspicion and therefore met constitutional requirements. Accordingly, we affirm the
Defendant‟s judgment of conviction.

                          Tenn. R. App. P. 11; Judgment of the
                          Court of Criminal Appeals Affirmed

JEFFREY S. BIVINS, J., delivered the opinion of the Court, in which SHARON G. LEE, C.J.,
and CORNELIA A. CLARK and HOLLY KIRBY, JJ., joined.

Patrick B. Newsom, Nashville, Tennessee, for the appellant, Linzey Danielle Smith.

Herbert H. Slatery III, Attorney General and Reporter; Andrée S. Blumstein, Solicitor
General; Leslie E. Price, Senior Counsel; Kim R. Helper, District Attorney General; and
Carlin Hess, Assistant District Attorney, for the appellee, the State of Tennessee.

1
        We heard oral argument in this case on September 30, 2015, at Cumberland University in
Lebanon, Tennessee, as part of the S.C.A.L.E.S. (Supreme Court Advancing Legal Education for
Students) project.
                                            OPINION

                               Factual and Procedural History

       The Defendant was charged in July 2013 with two alternative counts of driving
under the influence. The Defendant filed a motion to suppress on the basis that her traffic
stop was unconstitutional. At the ensuing hearing, held in October 2013, the following
proof was adduced:

       Trooper Chuck Achinger of the Tennessee Highway Patrol testified that, at
approximately 3:00 a.m. on December 6, 2012, he was travelling north on I-65 in
Williamson County, Tennessee. As he neared the 72 mile marker, he noticed a car in
front of him “drift over towards the shoulder” as it entered a “big swooping curve.” He
then observed the vehicle cross the fog line2 “by less than six inches, probably.” As the
car came out of the curve, “it corrected itself back into its lane, and then it drifted back
over to the right and almost went all the way over the fog line again. It corrected itself.
And then, again, it went back over and just barely touched the fog line again.” Trooper
Achinger clarified that, when the car crossed the fog line, both tires on the right side of
the car crossed the line “[e]ntirely.” Trooper Achinger observed this driving behavior
over the course of four to five tenths of a mile. He acknowledged that the Defendant‟s
driving did not endanger any other vehicles.

       Trooper Achinger continued to follow the car for approximately two more miles
and observed no further driving infractions. Nevertheless, he stopped the vehicle after it
exited the interstate. He testified that he stopped the driver because she failed to maintain
her lane of travel as required by Tennessee Code Annotated section 55-8-123.

       Trooper Achinger testified that he video-recorded the car as he followed it, but the
video did not record the fog line crossing because the camera was “zoomed in” to the
extent that, during the curve, it was “facing off into the distance.” The video recording
was admitted into evidence and accords with Trooper Achinger‟s testimony.

        The trial court accredited Trooper Achinger‟s testimony and determined that he
had probable cause to stop the Defendant based on his observation of the car crossing the
fog line, thereby violating Tennessee Code Annotated section 55-8-123. Accordingly,
the trial court denied the Defendant‟s motion to suppress. The Defendant subsequently
pleaded guilty to one count of driving under the influence and reserved the following
certified question of law:

2
       This Court has used the term “fog line” to describe the line painted on a roadway to define its
edge. See Helton v. Knox Cnty., Tenn., 922 S.W.2d 877, 880 (Tenn. 1996).
                                                  2
              Whether the stop of Defendant‟s vehicle by trooper Charles C.
       Achinger of Tennessee Highway Patrol on December 6th, 2012, violated
       Defendant‟s rights granted pursuant to the Fourth Amendment to the U.S.
       Constitution and Article I, Section[] 7 of the Tennessee Constitution and
       whether any evidence, statements and blood tests obtained as a result of
       said stop should be suppressed as the fruits of an unconstitutional seizure,
       due to the fact that there was no probable cause that a traffic violation ha[d]
       been committed under Tenn. Code Ann. § 55-8-231(1), and there was no
       reasonable suspicion based on the totality of the circumstances, where
       Defendant was observed driving on a winding and sloping portion of a
       roadway for a distance of approximately 2.5 miles.

The Court of Criminal Appeals affirmed the trial court‟s judgment on the merits, with
one judge dissenting. See State v. Smith, No. M2013-02818-CCA-R3-CD, 2015 WL
412972, at *9 (Tenn. Crim. App. Feb. 2, 2015). We subsequently granted the
Defendant‟s application for permission to appeal.

                                   Standard of Review

        We will uphold a trial court‟s findings of fact at a suppression hearing unless the
evidence preponderates to the contrary. State v. Odom, 928 S.W.2d 18, 23 (Tenn. 1996).
“Questions of credibility of the witnesses, the weight and value of the evidence, and
resolution of conflicts in the evidence are matters entrusted to the trial judge as the trier
of fact.” Id. “We afford to the party prevailing in the trial court the strongest legitimate
view of the evidence and all reasonable and legitimate inferences that may be drawn from
that evidence.” State v. Keith, 978 S.W.2d 861, 864 (Tenn. 1998). As to the trial court‟s
application of the law to the facts, however, we apply a de novo standard of review. Id.

                                         Analysis

                                   Warrantless Seizures

       The Fourth Amendment to the United States Constitution provides that “[t]he right
of the people to be secure in their persons . . . against unreasonable searches and seizures,
shall not be violated, and no [w]arrants shall issue, but upon probable cause.” U.S.
Const. amend. IV. “The purpose of the prohibition against unreasonable searches and
seizures under the Fourth Amendment is to „safeguard the privacy and security of
individuals against arbitrary invasions of government officials.‟” State v. Yeargan, 958
S.W.2d 626, 629 (Tenn. 1997) (quoting Camara v. Municipal Court, 387 U.S. 523, 528
(1967)).

                                             3
       Likewise, Article I, Section 7 of the Tennessee Constitution provides that “the
people shall be secure in their persons . . . from unreasonable searches and seizures.”
Tenn. Const. art. I, § 7. This Court has stated that the Tennessee Constitution‟s search
and seizure provision “is identical in intent and purpose with the Fourth Amendment.”
Sneed v. State, 423 S.W.2d 857, 860 (Tenn. 1968); see also, e.g., State v. Scarborough,
201 S.W.3d 607, 622 (Tenn. 2006). Accordingly, “under both the federal and state
constitutions, a warrantless search or seizure is presumed unreasonable, and evidence
discovered as a result thereof is subject to suppression unless the State demonstrates that
the search or seizure was conducted pursuant to one of the narrowly defined exceptions to
the warrant requirement.” Yeargan, 958 S.W.2d at 629 (citing Coolidge v. New
Hampshire, 403 U.S. 443, 454-55 (1971); State v. Bartram, 925 S.W.2d 227, 229-30
(Tenn. 1996)).

       Individuals do not lose their constitutional protections against unreasonable
searches and seizures by getting into an automobile. See Delaware v. Prouse, 440 U.S.
648, 662-63 (1979). Therefore, when a police officer seizes a motorist by turning on his
blue lights in order to pull the motorist over, the stop must pass constitutional muster.
See State v. Pulley, 863 S.W.2d 29, 30 (Tenn. 1993). The reasonableness of such
seizures, and therefore their legality, “depends on a balance between the public interest
and the individual‟s right to personal security free from arbitrary interference by law
officers.” United States v. Brignoni-Ponce, 422 U.S. 873, 878 (1975) (citing Terry v.
Ohio, 392 U.S. 1, 20-21 (1968); Camara, 387 U.S. at 536-37).

                       Probable Cause and Reasonable Suspicion

        A police officer‟s traffic stop of a motorist will pass constitutional muster if the
officer has “probable cause” to believe that the motorist has committed a traffic offense.
See State v. Vineyard, 958 S.W.2d 730, 736 (Tenn. 1997) (holding that officers‟
observation of defendant‟s violations of traffic laws created probable cause to stop
defendant); see also United States v. Barry, 98 F.3d 373, 376 (8th Cir. 1996) (recognizing
that even minor traffic violations create probable cause to stop the driver); State v.
Berrios, 235 S.W.3d 99, 105 (Tenn. 2007) (recognizing that, “[a]s a general rule, if the
police have probable cause to believe a traffic violation has occurred, the stop is
constitutionally reasonable” (citing Whren v. United States, 517 U.S. 806, 810 (1996))).
“Articulating precisely what . . . „probable cause‟ mean[s] is not possible.” Ornelas v.
United States, 517 U.S. 690, 695 (1996). Rather, probable cause is a “practical,
nontechnical” concept. State v. Jacumin, 778 S.W.2d 430, 432 (Tenn. 1989) (quoting
Illinois v. Gates, 462 U.S. 213, 231 (1983)). As we recently reiterated, “probable cause
exists when „at the time of the [seizure], the facts and circumstances within the
knowledge of the officers, and of which they had reasonably trustworthy information, are
sufficient to warrant a prudent person in believing that the defendant had committed or
                                             4
was committing an offense.‟” State v. Dotson, 450 S.W.3d 1, 50 (Tenn. 2014) (quoting
State v. Echols, 382 S.W.3d 266, 277-78 (Tenn. 2012)).

       Many of our traffic statutes create offenses which render it simple for an officer to
determine whether a motorist has committed a violation. For instance, Tennessee Code
Annotated section 55-8-149 renders it an offense to run a stop sign “except when directed
to proceed by a police officer or traffic control signal.” Tenn. Code Ann. § 55-8-149(c)
(2012). Likewise, it is an offense for a motorist to exceed the applicable speed limit. See
id. § 55-8-152 (2012). When a police officer sees a motorist commit such an offense, the
officer will have probable cause to stop the motorist. Accordingly, if a police officer sees
a driver run a red light, or clocks a driver speeding, the officer‟s stop of the motorist will
pass constitutional muster. See, e.g., United States v. Winters, 782 F.3d 289, 296 (6th
Cir. 2015) (holding that, because officer witnessed defendant driving 72 miles per hour in
a 55 mile-per-hour zone, officer “had probable cause to believe that a traffic violation
was occurring”). Under such circumstances, no further investigation is necessary and the
police officer is justified in issuing a citation.

       Some driving conduct, however, may or may not constitute a traffic offense. For
instance, a police officer patrolling late at night may observe a driver weaving within her
own lane of travel, driving below the speed limit, and engaging in prolonged delays at
four-way-stop intersections in spite of the absence of any other traffic. While this driving
behavior may not violate any of our “rules of the road” statutes, see Tenn. Code Ann. §§
55-8-101 through 55-8-199 (2012), under these circumstances, the officer may suspect
that the motorist is intoxicated. When an officer merely suspects a driving offense, but
needs to investigate further in order to discern whether the driver, in fact, is committing
the offense, a different constitutional standard for stopping the motorist is implicated.3

       If a police officer lacks probable cause to seize a motorist, he nevertheless may
legitimately initiate a brief, investigatory traffic stop if he possesses a “reasonable
suspicion, supported by specific and articulable facts, that a criminal offense has been or
is about to be committed.” State v. Binette, 33 S.W.3d 215, 218 (Tenn. 2000) (citing
Terry, 392 U.S. at 20-21; State v. Bridges, 963 S.W.2d 487, 492 (Tenn. 1997)). Unlike
3
        We caution that slight weaving within one‟s lane ordinarily will not support a stop under any
standard. See State v. Binette, 33 S.W.3d 215, 219-20 (Tenn. 2000) (holding that officer did not have
grounds to stop, on suspicion of DUI, a motorist who wove slightly within her own lane and whose left
tires merely touched the center lane line); see also United States v. Gregory, 79 F.3d 973, 978-79 (10th
Cir. 1996) (recognizing that, “[i]f failure to follow a perfect vector down the highway or keeping one‟s
eyes on the road were sufficient reasons to suspect a person of driving while impaired, a substantial
portion of the public would be subject each day to an invasion of their privacy” (quoting United States v.
Lyons, 7 F.3d 973, 976 (10th Cir. 1993)) (internal quotation marks omitted)). We further caution that the
driving behavior described in our hypothetical will not necessarily provide a constitutional basis to seize a
driver.
                                                     5
the examples above in which a police officer has probable cause to stop a motorist in
order to issue a citation, reasonable suspicion stops are investigatory in nature.

       “The level of reasonable suspicion required to support an investigatory stop is
lower than that required for probable cause.” State v. Day, 263 S.W.3d 891, 902 (Tenn.
2008) (citing Alabama v. White, 496 U.S. 325, 330 (1990); Pulley, 863 S.W.2d at 31)).
Nevertheless, “[r]easonable suspicion is a particularized and objective basis for
suspecting the subject of a stop of criminal activity,” Binette, 33 S.W.3d at 218 (emphasis
added) (citing Ornelas, 517 U.S. at 696), and must be “something more than the officer‟s
„inchoate and unparticularized suspicion or hunch,‟” Day, 263 S.W.3d at 902 (quoting
Terry, 392 U.S. at 27). Accordingly, “[i]n determining whether an investigatory
detention is based upon reasonable suspicion, we engage in a fact-intensive and objective
analysis, reviewing the record for specific and articulable facts, that the defendant had
committed, or was about to commit, a criminal offense.” State v. Hanning, 296 S.W.3d
44, 49 (Tenn. 2009) (internal quotation marks omitted); see also Day, 263 S.W.3d at 903
(recognizing that “a court must consider the totality of the circumstances when
determining whether a police officer‟s reasonable suspicion is supported by specific and
articulable facts” (citing White, 496 U.S. at 330)).

        “The evaluation [of reasonable suspicion] is made from the perspective of the
reasonable officer, not the reasonable person.” United States v. Quintana-Garcia, 343
F.3d 1266, 1270 (10th Cir. 2003); see also United States v. Valdez, 147 Fed. Appx. 591,
596 (6th Cir. 2005). Moreover, because a court reviews the validity of a stop from a
purely objective perspective, the officer‟s subjective state of mind is irrelevant, see
Brigham City, Utah v. Stuart, 547 U.S. 398, 404 (2006), and the court may consider
relevant circumstances demonstrated by the proof even if not articulated by the testifying
officer as reasons for the stop, see City of Highland Park v. Kane, 991 N.E.2d 333, 338
(Ill. App. Ct. 2013) (recognizing that, “[i]n analyzing whether a stop was proper, a court
is not limited to bases cited by the officer for effectuating the stop” (citing Whren, 517
U.S. at 813)); see also State v. Huddleston, 924 S.W.2d 666, 676 (Tenn. 1996)
(recognizing that an officer‟s “subjective belief that he did not have enough evidence to
obtain a warrant is irrelevant to whether or not probable cause actually existed”).
Additionally, if the defendant attempts to suppress evidence collected during the
challenged stop, the state is not limited in its opposing argument to the grounds
ostensibly relied upon by the officer if the proof supports the stop on other grounds. See
State v. Tague, 676 N.W.2d 197, 201 (Iowa 2004).




                                            6
                         Tennessee Code Annotated Section 55-8-123

       In State v. Davis, released simultaneously with this case, this Court determined
that Tennessee Code Annotated section 55-8-115(a)4 creates an offense that is committed
when a driver crosses the center lane line(s) of a roadway on even one occasion, unless
the crossing is made pursuant to one of the specific exceptions set forth in the statute.
See State v. Davis, No. E2013-02073-SC-R11-CD, __ S.W.3d __, __, ___ WL _____, at
*__ (Tenn. 2016). Whether or not a motorist violates section 55-8-115(a) can be
discerned from simple observation. Thus, for the reasons set forth above, if a police
officer sees a motorist drive across a double yellow line dividing the lanes of traffic on a
two-lane road, and the motorist did not do so in accord with one of the statutory
exceptions, the officer will have probable cause to stop the motorist. See id. at *__.

       In contrast, the traffic statute at issue in this case, Tennessee Code Annotated
section 55-8-123, provides, in pertinent part, as follows:

               Whenever any roadway has been divided into two (2) or more
       clearly marked lanes for traffic, the following rules, in addition to all others
       consistent with this section, shall apply:

              (1) A vehicle shall be driven as nearly as practicable entirely within
       a single lane and shall not be moved from that lane until the driver has first
       ascertained that the movement can be made with safety[.]



4
       Tennessee Code Annotated section 55-8-115(a) provides as follows:

                Upon all roadways of sufficient width, a vehicle shall be driven upon the right
       half of the roadway, except as follows:

               (1) When overtaking and passing another vehicle proceeding in the same
       direction under the rules governing such movement;

                (2) When the right half of a roadway is closed to traffic while under construction
       or repair;

               (3) Upon a roadway divided into three (3) marked lanes for traffic under the
       applicable rules thereon; or

               (4) Upon a roadway designated and signposted for one-way traffic.

Tenn. Code Ann. § 55-8-115(a) (2012).

                                                   7
Tenn. Code Ann. § 55-8-123(1) (2012) (“Section 123(1)”) (emphases added).5 The word
“practicable” is defined as “that which may be done, practiced, or accomplished; that
which is performable, feasible, possible.” Black‟s Law Dictionary 1172 (6th ed. 1990).

       In order to address whether an officer has constitutional grounds to stop a motorist
for violating Section 123(1), we first must determine what, precisely, this statute
prohibits.6 This is an issue of first impression before this Court.

        The role of this Court in statutory interpretation is to assign a statute the full effect
of the legislative intent without restricting or expanding the intended scope of the statute.
State v. Springer, 406 S.W.3d 526, 533 (Tenn. 2013); State v. Marshall, 319 S.W.3d 558,
561 (Tenn. 2010). In doing so, we must look to the plain language of the statute to
determine the legislature‟s intent. State v. Jennings, 130 S.W.3d 43, 46 (Tenn. 2004).
We must presume that “every word in the statute has meaning and purpose and should be
given full effect if the obvious intent of the General Assembly is not violated by so
doing.” Marshall, 319 S.W.3d at 561 (quoting Larsen-Ball v. Ball, 301 S.W.3d 228, 232
(Tenn. 2010)) (internal quotation marks omitted). When the language of a statute is clear
and unambiguous, “the legislative intent shall be derived from the plain and ordinary
meaning of the statutory language.” State v. Wilson, 132 S.W.3d 340, 341 (Tenn. 2004).

       We begin our analysis by taking into consideration various other statutes that are
related to Section 123(1). “Roadway” is defined as “that portion of a highway improved,
designed or ordinarily used for vehicular travel, exclusive of the berm or shoulder.”
Tenn. Code Ann. § 55-8-101(54) (2012) (emphasis added). “Highway” is in turn defined
as “the entire width between the boundary lines of every way when any part thereto is
open to the use of the public for purposes of vehicular travel.” Id. § 55-8-101(24)
(emphasis added). Consistent with Section 123(1), these two provisions indicate that, as
a general rule, vehicles should be driven within lane markers. Additionally, Tennessee
Code Annotated section 55-8-103 provides that

5
       Section 123(1) was initially passed in 1955 and has remained unchanged.
6
       Section 123(1) closely tracks a provision of the Uniform Vehicle Code:

       Whenever any roadway has been divided into two or more clearly marked lanes for
       traffic the following rules in addition to all others consistent herewith shall apply. (a) A
       vehicle shall be driven, as nearly as practicable, entirely within a single lane and shall not
       be moved from such lane until the driver has first ascertained that such movement can be
       made with safety.

Unif. Vehicle Code § 11-309(a) (2000) (as quoted in State v. Phillips, 2006 WL 3477003, at *8 n.9 (Ohio
Ct. App. Dec. 4, 2006)). All fifty states have passed legislation mirroring this provision. See State v.
Regis, 32 A.3d 1109, 1112 n.2 (N.J. 2011).
                                                     8
        [i]t is unlawful and, unless otherwise declared in this chapter and chapter
        10, parts 1-5 of this title with respect to particular offenses, it is a Class C
        misdemeanor, for any person to do any act forbidden or fail to perform any
        act required in this chapter and chapter 10 of this title.

Id. § 55-8-103 (2012).

        Initially, we have no trouble concluding that crossing over a fog line with two of a
car‟s four wheels is an instance of leaving one‟s lane of travel. However, unlike the
statute at issue in Davis, Section 123(1) does not create an offense that always may be
discerned simply by observation. Accord People v. Hackett, 971 N.E.2d 1058, 1066 (Ill.
2012) (stating that “it is clear that [Illinois‟ version of Section 123(1)] is not a strict
liability offense” (citing 625 Ill. Comp. Stat. Ann. 5/11-709(a) (West 2008))); State v.
Marx, 215 P.3d 601, 612 (Kan. 2009) (stating that Kansas‟ version of Section 123(1) “is
not a strict liability offense” because the “express language employed—„as nearly as
practicable‟—contradicts the notion that any and all intrusions upon the marker lines of
the chosen travel lane constitute a violation” (citing Kan. Stat. Ann. § 8-1522(a))).
Rather, Section 123(1) contains two contingencies that impact whether crossing over a
fog (or other lane) line is an offense. First, a motorist is required to remain in a single
lane only so far as it is “practicable” to do so. See, e.g., Mitchell v. State, 347 P.3d 1278,
1280 (Mont. 2015) (holding that the “plain meaning” of Montana‟s version of Section
123(1) is that “moving from a lane of traffic is usually prohibited to the extent that it is
feasible for a vehicle to be operated within the lane of traffic”). If, for instance,
obstructions in the lane render it impracticable to remain in the lane, leaving the lane may
be permitted. Thus, “[t]he statute clearly requires a fact-specific inquiry into the
particular circumstances present during the incident to determine whether factors such as
weather, obstacles, or road conditions might have necessitated [a motorist‟s] lane
deviation.” Hackett, 971 N.E.2d at 1066. Second, if remaining in a single lane becomes
impracticable, the driver may leave her lane of travel only after first ascertaining that the
movement can be made safely.

      In construing New Jersey‟s virtually identical “as nearly as practicable” statute,7
the New Jersey Supreme Court has concluded that the statute “contains two separate legal

7
        New Jersey‟s version of Section 123(1) provides, in pertinent part, that,

        [w]hen a roadway has been divided into clearly marked lanes for traffic, drivers of
        vehicles shall obey the following regulations: . . . A vehicle shall be driven as nearly as
        practicable entirely within a single lane and shall not be moved from that lane until the
        driver has first ascertained that the movement can be made with safety[.]

N. J. Stat. Ann. § 39:4-88(b) (as quoted in Regis, 32 A.3d at 1112).
                                                     9
predicates directing the conduct of drivers: „shall be driven‟ in the first clause and „shall
not be moved‟ in the second.” State v. Regis, 32 A.3d 1109, 1114 (N.J. 2011). The New
Jersey court continued:

               The statute‟s two clauses address different circumstances. The first
        clause imposes a continuous requirement upon the driver: to maintain his
        or her vehicle in a single lane, by avoiding drifting or swerving into an
        adjoining lane or the shoulder, unless it is not feasible to do so.

                ....

                Moreover, the first clause of N.J.S.A. 39:4-88(b) is not limited to
        circumstances in which the deviation from the lane is demonstrated to be a
        danger to other drivers. . . . By the terms of the first clause of N.J.S.A. 39:4-
        88(b), the mandate to drive within a single lane to the extent practicable
        applies, whether or not a deviation from that lane imposes a risk to another
        driver.

                The statute‟s second clause addresses a related, but discrete, mandate
        of the Code. It requires a driver to ascertain the safety of switching lanes
        before conducting a lane change. N.J.S.A. 39:4-88(b). Unlike the violation
        described in the first clause of N.J.S.A. 39:4-88(b), the violation described
        in the second clause is avoided if a driver, in a roadway with multiple lanes
        traveling in the same direction, first determines that departure from a lane
        may be conducted safely.

Id. at 1114-15 (footnote omitted).

        Similarly, in construing Kansas‟ virtually identical “as nearly as practicable”
statute,8 the Kansas Supreme Court held as follows:

8
        Kansas‟ version of Section 123(1) provides as follows:

                Whenever any roadway has been divided into two (2) or more clearly marked
        lanes for traffic, the following rules in addition to all others consistent herewith shall
        apply.

               (a) A vehicle shall be driven as nearly as practicable entirely within a single lane
        and shall not be moved from such lane until the driver has first ascertained that such
        movement can be made with safety.

Kan. Stat. Ann. § 8-1522 (as quoted in Marx, 215 P.3d at 606).

                                                    10
        [W]e interpret K.S.A. 8-1522(a) as establishing two separate rules of the
        road. The first requires a driver to keep entirely within a single lane while
        traveling on a roadway with two or more clearly marked lanes. That rule is
        temporarily suspended when it becomes impracticable to stay within the
        lane markers and when the driver is properly effecting a lane change. . . .
        The second rule provides that before a driver may change lanes or move
        from the current lane of travel to another location, he or she must ascertain
        that the movement can be made with safety. A traffic infraction occurs
        under K.S.A. 8-1522(a) when either rule of the road is violated.

Marx, 215 P.3d at 612 (emphasis added); see also State v. McBroom, 39 P.3d 226, 229
(Or. Ct. App. 2002) (stating that the second provision of Oregon‟s version of Section
123(1) does not permit a motorist to “stray” outside his lane of travel even if the straying
is accomplished safely (citing Or. Rev. Stat. § 811.370(1))).

        We recognize that other courts, in effect, have combined the two contingencies of
their jurisdiction‟s version of Section 123(1) and concluded that a violation occurs only
when there is proof that the motorist‟s lane excursion created some level of danger.9 See,

9
         As numerous other courts have recognized, “[t]he courts of other states have not interpreted this
uniform traffic provision uniformly.” McBroom, 39 P.3d at 229 n.4; see also, e.g., United States v. Jones,
501 F. Supp. 2d 1284, 1296 (D. Kan. 2007) (in construing Kansas‟ version of Section 123(1), noting that
“[a] review of other jurisdictions reveals more diversity in interpretation than one would expect for a
uniform vehicle code provision”); State v. Wolfer, 780 N.W.2d 650, 652-53 (N.D. 2010) (referring to the
“body of law” addressing traffic stops based on similar statutes and applying “varying standards and
interpretations”); State v. Hett, 834 N.W.2d 317, 321 (S.D. 2013) (recognizing the “division of authority”
on the issue of what constitutes a violation of statutes like Section 123(1)). Indeed, as demonstrated by its
split decision in this case, our own Court of Criminal Appeals has wrestled with the circumstances under
which a police officer might legitimately stop a motorist for either an actual or suspected violation of
Section 123(1). See Smith, 2015 WL 412972, at *8 (majority holding that Trooper Achinger had both
probable cause and reasonable suspicion to stop the Defendant); id. at *9-10 (Ogle, J., dissenting) (dissent
opining that the trial court should have granted the motion to suppress because Trooper Achinger did not
have probable cause to stop the Defendant); see also, e.g., State v. Martin, No. E1999-01361-CCA-R3-
CD, 2000 WL 1273889, at *6 (Tenn. Crim. App. Sept. 8, 2000) (holding that “briefly” crossing a fog line
does not violate Section 123(1) because “a momentary drift out of a lane [does not] constitute[] driving a
vehicle outside of a single lane”); cf., e.g., State v. Gothard, No. E2005-02776-CCA-R3-CD, 2006 WL
3870957, at *4-5 (Tenn. Crim. App. Dec. 21, 2006) (upholding traffic stop where defendant crossed fog
line five times, distinguishing Martin on basis that defendant‟s fog line crossing was “not a single isolated
incident”); State v. Walker, No. E2005-02200-CCA-R3-CD, 2006 WL 2061724, at *5 (Tenn. Crim. App.
July 26, 2006) (upholding traffic stop in part because defendant crossed fog line with three tires,
distinguishing Martin in which motorist crossed fog line “ever so briefly” with only two tires).




                                                    11
e.g., United States v. Delgado-Hernandez, 283 Fed. Appx. 493, 499 (9th Cir. 2008)
(holding that, when evaluating whether a motorist‟s driving violated Nevada‟s version of
Section 123(1), courts should consider “whether, under the circumstances presented, the
driver‟s conduct did threaten, or could be reasonably construed as potentially threatening,
the safety of other motorists, pedestrians or bystanders” (citing Nev. Rev. Stat. §
484.305(1))); Crooks v. State, 710 So. 2d 1041, 1043 (Fla. Dist. Ct. App. 1998) (holding
that Florida‟s version of Section 123(1) is not violated unless “the driver‟s conduct
created a reasonable safety concern” (citing Fla. Stat. § 316.089(1) (1995))); Rowe v.
State, 769 A.2d 879, 889 (Md. 2001) (concluding that motorist‟s “momentary crossing of
the edge line of the roadway and later touching of that line did not amount to an unsafe
lane change or unsafe entry onto the roadway, conduct prohibited by [Maryland‟s version
of Section 123(1)], and, thus, cannot support the traffic stop” (citing Md. Code Ann.,
Transp. § 21-309(b))); State v. Lucero, No. 31,932, 2013 WL 4516412, at *3 (N.M. Ct.
App. Feb. 26, 2013) (holding that New Mexico‟s version of Section 123(1) “is not
intended to cover situations where the person driving a vehicle unintentionally lets the
vehicle stray from its lane when there is no other traffic that it might either sideswipe or
collide with” (citing N.M. Stat. Ann. § 66-7-317(A) (1978); Archibeque v. Homrick, 543
P.2d 820, 825 (N.M. 1975))); State v. Huddleston, 164 S.W.3d 711, 716 (Tex. Crim.
App. 2005) (officer did not have reasonable suspicion to stop motorist for violating
Texas‟ version of Section 123(1) because “[w]itnessing [the motorist] safely cross the fog
line five times over a stretch of six miles did not give [the officer] a reason to suspect that
she was unsafely failing to remain in a single lane” (citing Tex. Transp. Code Ann. §
545.060(a) (West 2004))); see also Hoay v. State, 55 S.W.3d 782, 786 (Ark. App. 2001)
(holding that officer did not have probable cause to stop motorist for violating Arkansas‟
version of Section 123(1) because there was no evidence that the motorist did not first
ascertain that his twice crossing fog line could be made safely (citing Ark. Code Ann. §
27-51-302(1) (Repl. 1994))); Tague, 676 N.W.2d at 203-04 (holding that traffic stop

        Noting the confusion surrounding the interpretation of various states‟ versions of Section 123(1),
one of Wyoming‟s Supreme Court Justices opined that

        [T]his is one bizarre statute. Apparently, it is not a crime if one violates the statute a little
        bit, but it is a crime if one violates the statute somewhat more than a little bit. If you stay
        in your lane, you have not violated the statute, but if you go out of your lane, you may
        have violated the statute. In the context of the present case, if the appellant‟s conduct
        may or may not have provided the officer with reasonable suspicion and/or probable
        cause to believe that the appellant violated the statute, how on earth is the appellant
        supposed to have notice, before the fact, that his conduct will violate the statute?

Dods v. State, 240 P.3d 1208, 1213 (Wyo. 2010) (Voigt, J., concurring). We note that there has been no
constitutional challenge to Section 123(1) raised in this case.


                                                      12
under Iowa‟s version of Section 123(1) was not supported by probable cause because,
although motorist briefly crossed lane edge line, the state failed to prove “any objective
basis to believe [motorist‟s] movement was done without first ascertaining that he could
make such movement with safety” (citing Iowa Code Ann. § 321.306)).

       We respectfully disagree with this “combining” approach because it adds a
requirement that is not reflected in, or required by, the plain text of Section 123(1). As
did the Kansas Supreme Court, we view the plain language of Section 123(1) as
establishing two rules of the road, see Marx, 215 P.3d at 612, and the failure to maintain
either of them may result in a violation regardless of whether an actual danger is thereby
created, accord id. at 611(holding that there is “no support in the statute for conditioning
a violation of the single lane rule upon proof that driving outside the lane markers was
unsafe”). Further, as noted by the New Jersey Supreme Court,

       If N.J.S.A. 39:4-88(b) prohibits nothing more than a lane change conducted
       unsafely as described in the statute‟s second clause, then the Legislature‟s
       language in the first clause would have no meaning. . . . The Court‟s
       construction of N.J.S.A. 39:4-88(b) gives meaning to all of the statute‟s
       language, and thereby effects the intent of the Legislature.

              Moreover, if N.J.S.A. 39:4-88(b) precludes only unsafe lane
       changes, a driver would not violate the statute even by allowing a vehicle to
       straddle two lanes or swerve back and forth over the lines defining traffic
       lanes, unless that conduct created a safety issue.

Regis, 32 A.3d at 1115.

       Clearly, the primary purpose of Section 123(1) is to enhance highway safety. Just
as clearly, a motorist must be allowed to leave her lane of travel in order to avoid
obstructions or other dangers. Nevertheless, such excursions must be made as safely as
possible, to wit, after the motorist checks the traffic conditions around her and maneuvers
accordingly. However, it is not just deliberate lane excursions that may endanger other
drivers or pedestrians. Accidental lane excursions, by definition, are made without the
motorist first ascertaining their safety. Such inadvertent maneuvers may cause as much
danger or damage as those made deliberately in the face of observed risks. Certainly, a
motorist who is accidentally leaving her lane of travel creates a driving hazard at least to
herself, if not to others.

       Thus, we agree with the Ohio Court of Appeals‟ observations about the public
policies underlying a legislature‟s adoption of a statute like Section 123(1):

                                            13
               The legislature did not intend for a motorist to be punished when
        road debris or a parked vehicle makes it necessary to travel outside the lane.
        Nor, we are quite certain, did the legislature intend this statute to punish
        motorists for traveling outside their lane to avoid striking a child or animal.
        We are equally certain the legislature did not intend the statute to give
        motorists the option of staying within the lane at their choosing. Common
        sense dictates that the statute is designed to keep travelers, both in vehicles
        and pedestrians, safe. The logical conclusion is that the legislature intended
        only special circumstances to be valid reasons to leave a lane, not mere
        inattentiveness or carelessness. To believe that the statute was intended to
        allow the motorists the option of when they will or will not abide by the
        lane requirement is simply not reasonable.

State v. Hodge, 771 N.E.2d 331, 338 (Ohio Ct. App. 2002) (citing Ohio Rev. Code Ann.
§ 4511.33); see also Tague, 676 N.W.2d at 203 (holding that the “dual purpose” of
Iowa‟s version of Section 123(1) “is to promote the integrity of the lane markings on the
highway and to ensure the safe movement of vehicles on laned roadways”).

       Therefore, based on the plain language of the statute, and guided by our concern
for public safety, we hold that Section 123(1) is violated when a motorist strays outside
of her lane of travel when either (1) it is practicable10 for her to remain in her lane of
travel or (2) she fails to first ascertain that the maneuver can be made with safety. See
Tenn. Code Ann. § 55-8-123(1). Thus, even minor lane excursions may establish a
violation of Section 123(1) whether or not the excursion creates a specific, observed
danger.11 Accord United States v. Bentley, 795 F.3d 630, 634 (7th Cir. 2015) (holding
that proof of at least one instance of defendant‟s car crossing the fog line was enough to
support stop under Illinois‟ version of Section 123(1) and noting that, “especially for
probable cause determinations, there is no rule excusing momentary slips”), pet‟n for
cert. docketed (Jan. 21, 2016); United States v. Salas, 756 F.3d 1196, 1202 (10th Cir.
2014) (holding that even a single crossing of the fog line created reasonable suspicion to
stop a motorist for violating Oklahoma‟s version of Section 123(1)); United States v.
Alvardo, 430 F.3d 1305, 1309 (10th Cir. 2005) (holding that reasonable suspicion
supported traffic stop under Utah‟s version of Section 123(1) after officer observed
vehicle drift one foot over fog line where “the driver could reasonably be expected to
maintain a straight course at that time in that vehicle on that roadway”); State v. Johnson,

10
        With regard to practicability, we recognize specifically that a motorist legitimately may leave her
lane of travel in order to pass another motorist so long as the passing maneuver is made in accordance
with the applicable statutes.
11
        We emphasize that an officer has discretion as to when to stop drivers for such possible
violations. We do not mean to require or imply that a stop should be made in all such instances.
                                                    14
No. A07-1566, 2008 WL 5214469, at *3 (Minn. Ct. App. Dec. 16, 2008) (holding that
officer‟s observation of defendant‟s car crossing the fog line a single time, “although it
may be an insignificant infraction [of Minnesota‟s version of Section 123(1),] provided
the officer a specific reason to believe that the traffic code had been violated and to stop
the car . . . for a limited investigatory stop”); State v. Wolfer, 780 N.W.2d 650, 652 (N.D.
2010) (holding that defendant‟s single crossing of fog line gave officer reasonable
suspicion that motorist violated North Dakota‟s version of Section 123(1) because “the
record contains evidence demonstrating the practicability of [defendant] remaining
entirely within his lane”); State v. Mays, 894 N.E.2d 1204, 1210 (Ohio 2008) (holding
that “a traffic stop is constitutionally valid when a law-enforcement officer witnesses a
motorist drift over the lane markings in violation of [Ohio‟s version of Section 123(1)],
even without further evidence of erratic or unsafe driving”); Hodge, 771 N.E.2d at 339
(holding that motorist‟s partial drifting from one lane into adjacent lane “when it was
practicable to stay within his own lane” supported traffic stop for violation of Ohio‟s
version of Section 123(1)); State v. Hett, 834 N.W.2d 317, 323 (S.D. 2013) (holding that
motorist‟s single crossing of fog line created a reasonable suspicion that motorist had
violated South Dakota‟s version of Section 123(1) when the facts demonstrated the
practicability of the motorist remaining entirely within his lane); Dods v. State, 240 P.3d
1208, 1211-12 (Wyo. 2010) (holding that “a single instance of crossing the fog line can
indeed be a violation of [Wyoming‟s version of Section 123(1)]” but cautioning that “a
court must examine all of the surrounding circumstances to determine whether there is a
justification for the stop”); see also Mitchell, 347 P.3d at 1280 (holding that motorist
violated Montana‟s version of Section 123(1) by crossing the center yellow line and
officer therefore had reasonable suspicion to stop motorist); State v. Bedell, No. 2011-
069, 2011 WL 6003859, at *2 (Vt. Nov. 9, 2011) (entry order) (holding that motorist‟s
crossing of center lane line provided officer with reasonable suspicion to stop motorist
for violating Vermont‟s version of Section 123(1)); but see, e.g., State v. Au, 829 N.W.2d
695, 700 (Neb. 2013) (officer did not have probable cause to stop motorist for violating
Nebraska‟s version of Section 123(1) because officer‟s testimony “failed to establish that
vehicle was not driven „as nearly as practicable‟ in the right-hand lane” but “showed that
touching or crossing lane divider lines was a common occurrence”).

       In this regard, we respectfully disagree with the Kansas Supreme Court which, in
spite of its analysis quoted supra, went on to construe Kansas‟ version of Section 123(1)
as “requir[ing] more than an incidental and minimal lane breach” because the text of the
statute “only requires compliance with the single lane rule as nearly as practicable, i.e.,
compliance that is close to that which is feasible.” Marx, 215 P.3d at 612; see also, e.g.,
State v. Livingston, 75 P.3d 1103, 1106 (Ariz. Ct. App. 2003) (holding that “as nearly as
practicable” language contained in Arizona‟s version of Section 123(1) “demonstrates an
express legislative intent to avoid penalizing brief, momentary, and minor deviations
outside the marked lines”). We reject this muddying of the waters. The words
                                            15
“incidental,” “minimal,” “brief,” “momentary,” and “minor” present significant
definitional challenges in the context of assessing the constitutionality of a traffic stop.12
Accordingly, we hold that “as nearly as practicable” means that a motorist must not leave
her lane of travel any more than is made necessary by the circumstance requiring the lane
excursion. For instance, if the motorist is driving a large vehicle with a high profile, such
as an RV, and the weather includes high velocity wind gusts, minor crossings of lane
lines occurring in conjunction with the wind gusts may satisfy the “as nearly as
practicable” language of the statute and may not constitute a violation of Section 123(1).
See, e.g., United States v. Freeman, 209 F.3d 464, 467-68 (6th Cir. 2000) (holding that
officer did not have probable cause to stop top-heavy motor home for violating Section
123(1) where motor home crossed fog line for one-third of a second during high winds);
United States v. Gregory, 79 F.3d 973, 978 (10th Cir. 1996) (holding that officer did not
have grounds to stop U-Haul rental truck under Utah‟s version of Section 123(1) because
“[t]he road was winding, the terrain mountainous and the weather condition was windy.
Under these conditions any vehicle could be subject to an isolated incident of moving
into the right shoulder of the roadway, without giving rise to a suspicion of criminal
activity.”); cf. United States v. Ozbirn, 189 F.3d 1194, 1198 (10th Cir. 1999) (construing
Kansas‟ version of Section 123(1) and holding that “[officer] had probable cause to stop
[defendant] after he saw the motor home drift onto the shoulder twice within a quarter
mile under optimal road, weather and traffic conditions”). Such lane excursions are not
caused by the danger of driver inattention and are not within the scope of the driving
conduct prohibited by Section 123(1).

       We caution that in many cases it will not be possible for an observing officer to
discern either the reason for a driver‟s leaving her lane of travel or whether she first
ascertained the safety of the maneuver. In those cases, the officer would have to
investigate further in order to determine whether the driving maneuver violated Section
123(1). See Hackett, 971 N.E.2d at 1066 (holding that an investigatory stop made after
officer observed motorist deviating from lane for no apparent reason “allows the officer
to inquire further into the reason for the lane deviation, either by inquiry of the driver or
verification of the condition of the roadway where the deviation occurred”). In such
cases, the officer would not have probable cause to stop the motorist but might have
sufficient reasonable suspicion to do so. See id. (holding that officer was justified in
making an investigatory traffic stop after observing motorist twice deviate from his own
lane of travel to an adjacent lane of travel for no obvious reason).

       Our review of the pertinent cases indicates that some courts have concluded that a
police officer has probable cause to stop a motorist simply upon observing the motorist
12
         Again, we emphasize that our holding today only relates to the constitutionally permissible
parameters of traffic stops made pursuant to the statute. We do not address or intend to alter an officer‟s
discretion in determining whether to make such a stop.
                                                    16
cross over a fog line. See, e.g., United States v. Sessoms, No. 2:14-CR-1-FL-1, 2014 WL
5822865, at *7-8 (E.D.N.C. Nov. 10, 2014) (holding that officer had probable cause to
stop motorist for violating North Carolina‟s version of Section 123(1) upon witnessing a
single fog line crossing); State v. Malone, 56 So. 3d 336, 343-44 (La. Ct. App. 2010)
(stating that a car crossing a fog line violates Louisiana‟s version of Section 123(1),
thereby providing “probable cause to believe that a traffic violation for improper lane
usage has occurred”). We respectfully reject this approach because it would be
tantamount to construing Section 123(1) as creating an offense that is always committed
upon a fog line crossing. Such a construction is contrary to the plain text of the statute.

       Moreover, the distinction between a stop based on probable cause and a stop based
on reasonable suspicion is not simply academic. As set forth above, reasonable suspicion
will support only a brief, investigatory stop. See Terry, 392 U.S. at 27-29; see also
Bentley, 795 F.3d at 633 (noting the necessity to “distinguish between stops based on
reasonable suspicion and those based on probable cause [because] [t]he latter are not
subject to the scope and duration restrictions of Terry”); State v. Troxell, 78 S.W.3d 866,
871 (Tenn. 2002) (recognizing that investigative stops must be “reasonably related in
scope to the circumstances which justified the interference in the first place” and that the
stop “must be temporary and last no longer than necessary to effectuate the purpose of
the stop” (quoting Terry, 392 U.S. at 20, and Florida v. Royer, 460 U.S. 491, 500 (1983))
(internal quotation marks omitted)).

        Upon our review of the cases cited above and other cases, and taking into account
the plain text of Section 123(1) and the overriding purpose of enhancing highway safety,
we conclude that, when an officer observes a motorist crossing a clearly marked fog line,
the totality of the circumstances may provide a reasonable suspicion sufficient to initiate
a traffic stop to investigate the possible violation of Section 123(1).13 If the officer
observes circumstances rendering it practicable for the motorist to remain in her lane of
travel, that observation will weigh in favor of reasonable suspicion. Similarly, if the
officer observes that the motorist‟s crossing of the fog line in some specific regard was
unsafe, indicating that the driver failed to first ascertain the safety of the lane excursion,
that observation will weigh in favor of reasonable suspicion. In all events, however, a
trial court considering the legality of a stop made pursuant to Section 123(1) must
consider all of the relevant circumstances in deciding whether the motorist‟s lane
excursion gave the officer a constitutionally sufficient basis to at least suspect that the
motorist was violating Section 123(1). See Alvarado, 430 F.3d at 1309 (opining that
determining the constitutionality of a traffic stop made pursuant to Utah‟s version of
Section 123(1) “require[s] a fact-specific inquiry into the particular circumstances present

13
        We recognize that some lane excursions may be so egregious that they will support probable
cause to stop the motorist.
                                               17
during the incident in question in order to determine whether the driver could reasonably
be expected to maintain a straight course at that time in that vehicle on that roadway”);
see also Day, 263 S.W.3d at 903 (“Determining whether reasonable suspicion exists in a
particular traffic stop is a fact-intensive and objective analysis.”).

        We reiterate that an individual does not lose her constitutional rights against
unreasonable seizures by driving a car. Nevertheless, an individual‟s constitutional rights
against unreasonable seizures must be balanced against the public interest of police
officers enforcing traffic statutes designed to ensure the safety of the motoring public,
pedestrians, and property. While minor traffic infractions may lead to the commendable
discovery of an intoxicated motorist, we are cognizant that there are many distractions in
today‟s driving environment that may divert a sober motorist‟s attention and cause her to
momentarily and inadvertently leave her lane of travel. See Marx, 215 P.3d at 607
(recognizing that “automobiles, unlike railway locomotives, do not run on fixed rails”).
Commentators have cautioned that allowing police officers to stop motorists for de
minimis driving anomalies creates a “stop at will” environment at complete odds with the
Fourth Amendment. See, e.g., Lewis R. Katz, “Lonesome Road”: Driving Without the
Fourth Amendment, 36 Seattle U. L. Rev. 1413, 1413 (Spring, 2013) (asserting that
“[o]ur streets and highways have become a police state where officers have virtually
unchecked discretion about which cars to stop for the myriad of traffic offenses contained
in state statutes and municipal ordinances”); David A. Moran, The New Fourth
Amendment Vehicle Doctrine: Stop and Search Any Car at Any Time, 47 Vill. L. Rev.
815, 816 (2002) (referring to a series of United States Supreme Court opinions as
establishing a “new, and greatly simplified, Fourth Amendment vehicle doctrine: the
police may, in their discretion, stop and search any vehicle at any time”); Elizabeth Ahern
Wells, Note, Warrantless Traffic Stops: A Suspension of Constitutional Guarantees in
Post September 11th America, 34 U. Tol. L. Rev. 899, 899 (Summer, 2003) (describing
the United States Supreme Court‟s interpretation of the reasonable suspicion standard as
having “evolved into a veritable green light for police officers, resulting in a complete
disregard for personal security”). We emphasize that our decision in this case is not
intended to provide law enforcement officers with “carte blanche” to seize motorists
every time they see a vehicle cross a fog line. Rather, an officer‟s seizure of a motorist
for a suspected violation of Section 123(1) must be supported, at a minimum, by a
reasonable suspicion, based on all of the relevant circumstances, that the driver left her
lane of travel when it was practicable to remain there and/or left her lane of travel without
first ascertaining that it was safe to do so.14

14
         We recognize our Court of Criminal Appeals‟ concern that our holding in this case “will likely
mean that all drivers (including law enforcement officers, prosecutors, and judges) who briefly cross a fog
line on the highways in Tennessee can be pulled over on the basis that the otherwise „innocent‟ driver has
established [reasonable suspicion] that she or he has committed a Class C misdemeanor criminal offense.”
Smith, 2015 WL 412972, at *8. Nonetheless, we are tasked with construing Tennessee‟s legislation as it
                                                   18
                                        The Defendant’s Stop

       Based upon the contingencies contained within Section 123(1), under the
particular facts and circumstances of this case, Trooper Achinger could not know whether
the Defendant actually had violated Section 123(1) except upon further investigation.
The record contains no proof about the Defendant‟s reasons for leaving her lane of travel.
The record also contains no proof about whether the Defendant first ascertained that she
could leave her lane of travel with safety. All Trooper Achinger observed was the
Defendant crossing over the fog line with the two right wheels of her car and then twice
touching it with the right wheels of her car.

       As we indicated above, crossing over a lane line with two of a car‟s four wheels is
an instance of leaving one‟s lane of travel. However, only by questioning the Defendant
would Trooper Achinger have been able to ascertain whether the Defendant had
determined that remaining within her lane of travel had become impracticable for some
legitimate reason unknown to him and whether she had first ascertained the safety of her
maneuver. Accordingly, we hold that the proper basis for analyzing the constitutionality
of Trooper Achinger‟s stop of the Defendant is whether he had a reasonable suspicion,
supported by specific and articulable facts, that the Defendant had violated Section
123(1) by crossing over the clearly marked fog line with the two right wheels of her car.

        Our conclusion is consistent with our analysis in State v. Brotherton, 323 S.W.3d
866 (Tenn. 2010). In that case, a state trooper saw a “bright light” shining from the
defendant‟s car‟s taillight area. Id. at 868. The trooper began following the defendant
and eventually stopped him “to investigate the broken taillight.” Id. During the stop, the
trooper deduced that the defendant was driving under the influence and arrested him. Id.
After the trial court denied the defendant‟s motion to suppress, the defendant pled guilty
to DUI but reserved a certified question of law regarding the legality of his traffic stop.
Id. at 869.

       This Court was careful to analyze the defendant‟s traffic stop in terms of whether
the officer had reasonable suspicion, not probable cause, to believe that the defendant
was in violation of Tennessee Code Annotated section 55-9-402(b), which contains
multiple requirements for vehicular “tail lamps” and “stoplights.” In Brotherton, the
defendant had used red tape in an attempt to repair a broken taillight, but the efficacy of
the repair was questionable. Because the repair permitted a “bright white light to shine

is written. If our legislators are concerned that too many innocent drivers are being pulled over for minor
lane infractions, they may amend Section 123(1) or pass other corrective legislation. See Thomas M.
Lockney & Mark A. Friese, Constitutional Roadkill in the Courts: Looking to the Legislature to Protect
North Dakota Motorists Against Almost Unlimited Police Power to Stop and Investigate Crime, 86 N.D.
L. Rev. 1 (2010) (proposing legislation to require probable cause for traffic stops).
                                                    19
through,” Brotherton, 323 S.W.3d at 871, contrary to the function of a taillight in good
repair, the officer had a specific and articulable reason to suspect that the defendant‟s car
was not in compliance with the statute‟s requirements, id. at 872. Accordingly, we held
that the officer was justified in conducting an investigatory stop of the defendant. Id.

       We turn, then, to whether Trooper Achinger‟s seizure of the Defendant was
supported by reasonable suspicion. This analysis requires us to consider, from the
position of a reasonable officer, the circumstances indicative of whether the driving
conditions facing the Defendant allowed her to remain entirely in her lane “as nearly as
practicable.” If there were no apparent driving conditions present that rendered it
impracticable for the Defendant to stay in her lane, then that fact supports a finding of
reasonable suspicion that the Defendant may have violated Section 123(1) by crossing the
fog line. For instance, had Trooper Achinger observed nothing more than the Defendant
crossing the fog line in order to avoid the body of a deer laying in her lane of travel, and
that she caused no safety hazard in doing so (thereby indicating that she had first
ascertained the safety of her maneuver), Trooper Achinger would have had no
constitutionally defensible reason to suspect that the Defendant had violated Section
123(1).

        Even if there was a circumstance that rendered it impracticable for the Defendant
to remain in her lane of travel, Trooper Achinger still might have had a constitutional
basis for initiating a traffic stop if he observed the Defendant leaving her lane of travel in
a manner that was unsafe. For instance, if the Defendant swerved to the left of the body
of a deer instead of to the right and thereby caused another vehicle to swerve to avoid a
collision, Trooper Achinger would have had at least a reasonable suspicion, if not
probable cause, to believe that the Defendant had violated Section 123(1) by failing to
ascertain that she could leave her lane of travel safely.

       Turning to the proof adduced at the hearing on the Defendant‟s motion to
suppress, we note first that Trooper Achinger observed the Defendant driving at
approximately 3:00 in the morning, a time at which a driver may be more likely to be
fatigued or impaired. Such circumstances increase the likelihood of accidental lane
excursions. Second, the Defendant was driving on an interstate highway, a roadway with
clearly marked lane lines, designed to be driven at high speeds, and with lanes wide
enough to accommodate tractor-trailers traveling side by side, even through the curves.
See United States v. Tang, 332 Fed. Appx. 446, 452 (10th Cir. 2009) (finding reasonable
suspicion to stop motorist for violating Utah‟s version of Section 123(1) where U-Haul
crossed fog line with both back right tires where, “[a]lthough it was dark and there was a
mild to moderate wind, the interstate was not winding or narrow and only curved
gradually to the left”); cf. Gregory, 79 F.3d at 978 (no reasonable suspicion to stop U-
Haul truck for a single fog line crossing where “[t]he road was winding, the terrain
                                             20
mountainous and the weather condition was windy”). Third, the video recording reveals
that the weather and the roadway were dry. Fourth, although the video camera did not
capture the Defendant actually crossing the fog line, it is clear from the recording that
Trooper Achinger did not need to swerve from the same lane of travel in order to avoid
some obstruction or pothole in the roadway while he was following the Defendant. See
Bentley, 795 F.3d at 634 (in upholding traffic stop for a suspected violation of Illinois‟
version of Section 123(1), noting that the proof demonstrated “no extenuating
circumstances that made it difficult for [the defendant] to stay in his lane”). Fifth, there is
no proof in the record indicating that the Defendant‟s lane excursion was preceded by a
signal indicating her intention to leave her lane or that it was followed by a lessening in
speed indicating her intention to pull onto the shoulder and stop. Again, these
circumstances are indicative of an inadvertent lane excursion.

       The totality of these circumstances established reasonable grounds to suspect that
the Defendant left her lane of travel accidentally, not because it was impracticable for her
to remain in her lane. As indicated above, if a motorist is engaging in a driving maneuver
by accident rather than deliberately, the motorist is not first ascertaining whether the
maneuver can be made with safety. In light of very similar circumstances, the United
States District Court for Kansas upheld a stop for a suspected violation of Kansas‟
version of Section 123(1):

       The court finds that Trooper Nicholas possessed reasonable suspicion the
       defendant Blanchard did not purposely move from her lane of travel onto
       the shoulder and, thereby, failed to first ascertain that her lane movement
       could be made safely. There is no evidence that the defendant Blanchard
       used her turn signal before crossing over the fog line and driving onto the
       shoulder by a tire‟s width. Instead of slowing down and stopping on the
       shoulder, the defendant‟s vehicle maintained its speed and returned to a
       proper lane of the roadway after a matter of seconds. There is no evidence
       that the defendant Blanchard departed from her lane onto the shoulder in
       response to an apparent hazard or adverse physical conditions or for some
       other equally valid or lawful reason. One can reasonably infer from these
       circumstances that the defendant Blanchard never actually intended to
       move from her lane of traffic. Thus, Trooper Nicholas had reasonable
       suspicion to believe that Blanchard moved out of her lane of travel without
       first ascertaining whether she could do so safely, all in violation of K.S.A. §
       8-1522(a).

United States v. Jones, 501 F. Supp. 2d 1284, 1298-99 (D. Kan. 2007) (footnotes
omitted).

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        Accordingly, we hold that the totality of the circumstances surrounding the
Defendant‟s traffic stop established a reasonable suspicion, supported by specific and
articulable facts, that the Defendant violated Section 123(1) when she crossed the fog line
and failed to remain entirely within her lane of travel. Therefore, Trooper Achinger was
justified in stopping the Defendant to investigate further the reasons for her leaving her
lane of travel. Cf. Marx, 215 P.3d at 612-13, 615 (holding that stop was not supported by
reasonable suspicion where officer testified only to seeing motor home cross fog line
once, overcorrect, and cross lane dividing two northbound lanes of interstate because
state produced no proof from which to infer that “it was practicable to maintain a single
lane” or of “traffic or weather conditions, time of day, or any other observation relating to
the practicability of the momentary deviation”) (latter quote from Davis, J., concurring).

       In sum, although we disagree with the trial court that probable cause supported the
Defendant‟s traffic stop, we hold that the trial court properly denied the Defendant‟s
motion to suppress. Accordingly, the Defendant is not entitled to relief on the basis of
her certified question of law, and we affirm the Defendant‟s judgment of conviction.

                                        Conclusion

       Trooper Achinger‟s stop of the Defendant did not violate the constitutional rights
of the Defendant because it was supported by reasonable suspicion. Therefore, we affirm
the judgment of the Court of Criminal Appeals.




                                          ________________________________
                                          JEFFREY S. BIVINS, JUSTICE




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