OPINION
¶ 1 Sаlt Lake City appeals the trial court’s order granting Defendant Tim Kelly Bench’s motion to suppress evidence obtained following a traffic stop, which led to his arrest for *658 driving while intoxicated. The City argues that there was reasonable, articulable suspicion to justify the stop based on Bench’s ex-wife’s telephoned report and on a police officer’s observation of Bench’s cautious driving. Additionally, the City essentially argues that the legal standards for establishing reasonable suspicion are lessened in a drunk driving case because of public safety concerns. We affirm the trial court’s decision.
BACKGROUND 1
12 On April 12, 2005, Officer Hudson heard via a dispatch report over his police radio that Bench’s ex-wife had called 911 and reported that Bench, who had just dropped off their children at her home in Salt Lake City’s Rose Park area, had transported the children in his vehicle while intoxicated. The dispatcher relayed the above information, described Bench’s vehicle, identified its license plate number, and gave Bench’s home address.
¶ 3 While patrolling in the Glendale area approximately thirty blocks away, Officer Hudson saw a vehicle that matched the dispatcher’s description. He made a U-turn and began following the vehicle, which he identified as Bench’s because the license plate number matсhed the one reported. While following Bench, Officer Hudson observed that Bench slowed his vehicle to approximately 25 miles per hour, about 10 miles per hour below the posted speed limit, and signaled for some five seconds before changing lanes. Officer Hudson observed no driving or equipment infractions before initiating a traffic stop two blocks later.
¶ 4 After further investigation, Officer Hudson arrested Bench for driving while intoxicated, a violаtion of Utah Code section 41-6a-502. See Utah Code Ann. § 41-6a-502 (2005). Bench moved to suppress all evidence obtained as a result of the stop, arguing that Officer Hudson did not have the requisite reasonable, articulable suspicion to justify stopping him. The trial court agreed, granted the motion, 2 and later dismissed the case for lack of evidence. The City appealed. See id. § 77 — 18a—1 (3)(b) (Supp.2007) (allowing prosecution to appeal in such circumstances).
ISSUE AND STANDARD OF REVIEW
¶ 5 The sole issue presented for our review is whether Officer Hudson, given only the information radioed by the 911 dispatcher and his own observations of Bench’s cautious driving, had reasonable, articulable suspicion of criminal wrongdoing sufficient to justify stopping Bench. In an appeal from a trial court’s denial of a motion to suppress evidence, “we review the trial court’s factual findings for clear error[,] and we review its conclusions of lаw for correctness.”
State v. Tiedemann,
ANALYSIS
¶ 6 On appeal, the City argues that there was reasonable suspicion to justify the stоp based on the dispatch report describing Bench’s ex-wife’s complaint and on Officer Hudson’s observation of Bench’s cautious driving. The City also argues that the legal standards for establishing reasonable suspicion are lessened in drunk driving cases as a matter of public policy, and that in cases like *659 this one, a concern for public safety mandates a stop when officers receive a report of a potentially intoxiсated driver. We address each argument in turn.
I. Reasonable Suspicion
¶ 7 Both the United States and Utah constitutions protect against “unreasonable searches and seizures.” U.S. Const. amend. IV; Utah Const. art. 1, § 14. A traffic stop constitutes a “seizure” and must, therefore, be reasonable if it is to withstand a constitutional challenge.
See State v. Case,
¶ 8 “The articulable facts supporting reasonable suspicion are usually grounded in an officer’s personal perceptions and inferences, but in some cases the officer may rely upon external information — e.g., an informant’s tip via police dispatch” in concluding there is a legal basis for a stop.
Kaysville City v. Mulcahy,
¶9 This case does not present the more familiar situation where a dispatcher simply broadcasts a “stop and investigate” directive, making it necessary for the prosecution to later reconstruct what the dispatcher actually knew in making her determination that there was reasonable suspicion on which to base a stop. Rather, the information broadcast by the dispatcher in this case was everything she knew — or so we infer from the City’s deсision not to call the dispatcher as a witness or introduce a tape recording of the 911 call, but instead to rely exclusively on Officer Hudson’s testimony about the dispatch.
¶ 10 Accordingly, we must determine whether the information conveyed by Bench’s ex-wife, as recounted by the dispatcher, together with the inferences that can be drawn therefrom, establish a reasonable suspicion that Bench was driving while intoxicated so as to justify Officer Hudson in stopping Bench — either on that basis alone *660 or when coupled with his observations of Bench’s cautious driving. We note that while the City argues on appeal that the information from the ex-wife was enough, Officer Hudson’s conduct suggests he did not think so. Rather than immediately effecting a stop upon seeing Bench’s vehicle, he instead followed behind, looking for signs of impairment. After following Bench for two blocks, he finally concluded that he saw such signs of impairment, namely slow driving and long signaling. We first consider whether Officer Hudson’s observations provided corroboration of the unadorned claim of intoxication relayed by the dispatcher.
A. Cautious Driving
¶ 11 The City contends that “Officer Hudson personally observed a driving pattern that was consistent with impaired driving and that he considered to be suspicious.” Like the trial court, we disagree that cautious driving is indicative of intoxication or other wrongdoing.
¶ 12 In following Benсh, Officer Hudson did not observe any illegal activity. On the contrary, he observed only Bench’s hyper-legal activity — driving well below the posted speed limit and signaling two seconds longer than legally required before changing lanes.
See
Utah Code Ann. § 41~6a-804(l)(b) (2005) (drivers must signal
at least
three seconds before changing lanes).
3
From this, he says he became suspicious, testifying that “when I see somebody driving that carefully, and I’m already paying attention to them ... then that definitely indicates to me that something’s going on. That they know I’m there and that they don’t want me to stop them.” Safe, ultra-cautious driving, however, even if motivated by a desire to avoid police contact, does not, without more, create reasonable suspicion sufficient to justify a traffic stop. Simply put, a desire to avoid an encounter with police does not indicate that a person is driving while intoxicated or is otherwise engaged in criminal activity. In another reasonable suspicion ease,
State v. Talbot,
citizens will avoid contact with police for reasons other than fear of being caught for a crime they have committed. A completely innocent person may wish to avoid the delay which a discussion with police may entail; others have a fear of police authority; still others resent and seek to avoid the “hassle” of a stop which lacks any basis.
Id.
at 494 n. 11.
Cf. Olmstead v. United States,
¶ 13 Bench’s conduct, far from being suggestive of intoxication, was “consistent with the habits and conduct of a normal driver.... [Without more, [it did] not provide a reasonable basis to suspect [him] of being intoxicated.”
Sandy City v. Thorsness,
B. Bench’s Ex-wife’s Report
¶ 14 We next consider whether Bench’s ex-wife’s report, as broadcast by the dispatcher, provided a sufficient basis on which to justify the stop. To establish that adequate articulable suspicion spurred the dispatcher’s broadcast, the prosecution must show that Bench’s ex-wife’s tip was reliable.
See Kaysville City v. Mulcahy,
1. Type of Tip or Informant Involved
¶ 15 The City argues that Bench’s ex-wife, as an identified citizen-informant, is a reliable source of information. Because a citizen-informant “volunteer[s] information out of concern for the community and not for personal benefit,”
id.
at 235 (citation and internal quotation marks omitted), and because “the informant is exposed to possible criminal and civil prosecution if the report is false,”
id.
(citation and internal quotation marks omitted), a tip from an identified citizen-informant is generally considered “highly reliable.”
City of St. George v. Carter,
¶ 16 We in no way suggest that Bench’s ex-wife actually harbored any ill will toward Bench, or that her report was motivated by anything other than a concern for public safety. What we do suggest is that in circumstances where, as here, a citizen-informant’s veracity is questionable, the fact that the citizen-informant identified herself carries significantly less weight in establishing the reliability of her tip and justifying a stop than it otherwise would.
See
2 Wayne R. LaFave,
Search and Seizure
§ 3.4(a), at 229 (4th ed.2004). This does not end our inquiry. It just makes the othеr factors — the detail of the information provided and corroboration— all the more important.
Cf. Anderson,
2. Details About the Observed Criminal Conduct
¶ 17 An informant’s report of illegal activity must be sufficiently detailed to justify a stop.
See Kaysville City v. Mulcahy,
¶ 18 While Bench’s ex-wife may have provided the same basic facts as the informant did in
Mulcahy,
the totality of circumstances surrounding the two cases is very different, and
Mulcahy
is easily distinguishable. In
Mulcahy,
we determined that the detаils provided had “a heightened air of reliability because [the informant] personally observed those details.... The events prompting [the] call unfolded as he spoke on the phone with the dispatcher. He reported [the defendant’s activities as he was seeing them.”
Id.
Similarly, in
State v. Roth,
¶ 19 We think it significant that in both
Mulcahy
and
Roth,
the details about the observed criminal conduct, though sparse, were
strongly
supported by at least one of the other factors — either the reliability of the informant or corroboration by law enforcement. In the absence of that strong support, an informant, like Bench’s ex-wife, must provide more detail to establish the reliability and sufficiency of her report.
Cf. State v. Valenzuela,
¶ 20 The lack of detail supporting Bench’s ex-wife’s report of his intoxicated driving is not necessarily a fatal flaw, however, for “members of the general public have a common knowledge about whether a person is under the influence of alcohol.”
Mulcahy,
3. Corroboration by Law Enforcement
¶ 21 An officer may corroborate an informant’s tip “ ‘either by observing the illegal activity or by finding the person, the vehicle and the location substantially as described by the informant.’ ”
Mulcahy,
¶ 22 We have already concluded that Bench’s cautious driving was not indicative of intoxication. Beyond that, though, the City argues that Officer Hudson sufficiently corroborated the information given to him when he observed Bench’s vehicle and confirmed that the license plate number matched the number reported.
¶ 23 This argument is similar to that made by the State in
State v. Case,
¶ 24 Under the circumstances here, where a potentially biased informant provided very little information to police, the fact that Officer Hudson saw Bench driving in a prudent manner thirty blocks from his ex-wife’s home was insufficient corroboration to establish the reliability of the tip or to otherwise justify Officer Hudson in stopping him.
II. Public Safety
¶25 The City asserts that “duе to the extreme danger posed by impaired drivers, public safety concerns justify Officer Hudson’s stop of the car because the assurance of public safety by removing impaired drivers from the road substantially outweighs the minimal intrusion into Mr. Bench’s right to be free from unreasonable searches and seizures.” Thus, the City essentially argues that the legal standards for establishing reasonable suspicion are lessened in a drunk driving case as a matter of рublic policy, and that in cases like this one, a concern for public safety mandates a stop when officers receive any report of a potentially intoxicated driver. In making its argument, the City relies on our comments in
Kaysville City v. Mulcahy,
¶26 Certainly, where an informant reports a drunk driver on the road, we must consider
“the ever-changing equation used to balance the rights of an individual to be free from unwarranted intrusions of his or her freedom of movement and right to privacy with the right оf the public to be protected from unreasonable danger. This equation and the balance change with the facts presented.”
Id.
at 236 (quoting
Tucker,
CONCLUSION
¶ 27 We agree with the trial court that Officer Hudson lacked sufficient reasonable, articulable suspicion to justify stopping Bench for driving while intoxicated. The circumstances surrounding Bench’s ex-wife’s report called her credibility into question, requiring more detail and greater corroboration to establish the reliability of her report. As she only provided a conclusory statement that Bench was intoxicated, without telling the dispatcher any facts that would support such a conclusion, we conclude that her report was not very reliable. Furthermore, Officer Hudson observеd nothing, prior to the stop, that corroborated the report of intoxication. Bench’s cautious driving was not a reasonable basis on which to suspect that he was driving while intoxicated. Thus, Officer Hudson lacked reasonable, articulable suspicion of criminal wrongdoing sufficient to justify stopping Bench.
¶ 28 The trial court’s suppression and dismissal orders are affirmed.
¶29 I CONCUR: JAMES Z. DAVIS, Judge.
*664 ¶ 30 I CONCUR IN THE RESULT: WILLIAM A. THORNE JR., Associate Presiding Judge.
Notes
. Our recitation of the facts is based on the trial court’s findings оf fact, supplemented with evidence in the record which supports the findings.
. In ruling from the bench, the trial court commented:
[I]n my mind there’s clearly not enough evidence to stop — to pull Mr. Bench over based on his driving pattern.
I mean, if it’s not illegal, ... if you allow this, then where do you stop pulling anybody over for anything? You're driving too legally, you know....
So then there’s the question of does the dispatch call make a difference? Does that broaden the umbrella? I think it does somewhat, but certainly not enough in this case.
. This section was amended in 2007 to substitute "two seconds" for "three seconds.” See Utah Code Ann. § 41-6a-804(l)(b) & amendment notes (Supp.2007). The earlier version of the statute is applicable here.
. Apparently in a later interview. Bench’s ex-wife told police that Bench "smelled strongly of alcohol, that he had poor balance, that he slurred his speech and that his eyes were glassy.” From all that appears in our record, these compelling detаils were neither volunteered to nor elicited by the dispatcher. Indeed, the City did not argue at the suppression hearing that Bench’s ex-wife gave the dispatcher these important details. And for purposes of our analysis, of course, it is the information the dispatcher knew that matters.
See Kaysville City v. Mulcahy,
5. In this case, the "area” referred to is apparently the west side of Salt Lake Valley, given that *663 Officer Hudson spotted Bench some four miles from his ex-wife's residence.
