¶ 1 Arizona Rule of Evidence 407 generally excludes evidence of “measures” taken “after an event” to prove a party’s negligence or culpability “in connection with the event.” We hold that Rule 407 applies even if the party took such measures without knowledge of, or for reasons unrelated to, the prior event. We also hold that the trial court did not err in finding that the evidence of subsequent measures was not offered for “another purpose.”
I
¶ 2 This wrongful death action arose from a collision in which decedent Mark Johnson, while driving westbound on U.S. Highway 60, struck the rear- end of a dump truck. 1 Before the accident, the truck driver exited a mining pit, stopped at the Peekary Road intersection, and turned onto the highway. He traveled approximately seven hundred feet before decedent’s vehicle hit his truck. An eyewitness stated the decedent made no attempt to stop, swerve, or slow down before the collision.
¶ 4 Johnson unsuccessfully sought to introduce evidence at trial that, after the accident, the State had posted a truck-crossing sign and allowed the mining company to install a variable message board near the Peckary Road intersection. She argued those signs were not “subsequent remedial measures” under Rule 407 because the State installed them without knowledge of, and not in response to, the decedent’s accident. She also argued that, even if the measures were remedial, the rule did not preclude admission of this evidence for “another purpose” — to rebut the State’s claims that the decedent was comparatively negligent and that the roadway conditions were open and obvious, and to prove the State’s knowledge of the dangerous intersection.
¶ 5 The trial court ruled that the evidence of subsequent signage “is not admissible merely because the State in this case denies that the intersection was unsafe,” finding impermissible any “backdoor attempt[] to use remedial measures to establish negligence [in] not having installed [the signs] earlier.” The jury returned a verdict in favor of the State. The trial court denied Johnson’s motion for new trial, ruling that Rule 407 applied even if the State had not known of the decedent’s accident when the signs were installed.
¶ 6 The court of appeals affirmed, holding that “subsequent remedial measures need not be in response to the incident at issue for Rule 407 to apply.”
Johnson v. Ariz. Dep’t of Transp.,
¶ 7 We granted review to address issues of statewide importance and first impression in Arizona relating to Rule 407. This Court has jurisdiction pursuant to Article 6, Section 5(3) of the Arizona Constitution and Arizona Revised Statutes section 12-120.24 (2003).
II
¶ 8 Arizona Rule of Evidence 407 provides: When, after an event, measures are taken, which if taken previously, would have made the event less likely to occur, evidence of the subsequent measures is not admissible to prove negligence or culpable conduct in connection with the event. This rule does not require the exclusion of evidence of subsequent measures when offered for another purpose, such as proving ownership, control, or feasibility of precautionary measures, if controverted, or impeachment.
¶ 9 The rule seeks to “encourage remedial measures by freeing the defendant from concern that such steps might be used against him as an admission by conduct.”
Readenour v. Marion Power Shovel,
¶ 10 Johnson argues that evidence of post-injury changes should be excluded under Rule 407 only if the defendant knew about an injury and made changes in response to it. Otherwise, she argues, the
¶ 11 There is nothing inherent in the word “remedial,” however, that presupposes knowledge of a prior accident by one undertaking repairs; a dangerous condition is remedied by subsequent measures even if the repairer is not aware that the condition has already caused an injury. Further, Rule 407 does not on its face require a causal relationship between the measures and the event, only that the measures were taken “after” the event and “would have made the event less likely to occur” if they had been taken before.
See Kaczmarek v. Allied Chem. Corp.,
¶ 12 We find similarly unpersuasive Johnson’s argument that the rule’s policy of encouraging safety improvements is not furthered when defendants act without knowledge of the event in question and, thus, without awareness of their potential liability. Although defendants who improve safety without knowledge of previous accidents may not be deterred by the risk of liability to a particular claimant, they may nonetheless be deterred by the risk of potential liability to unknown claimants if subsequent measure evidence were routinely admitted when measures are taken without knowledge of previous injuries.
See Doe v. Johnston,
¶ 13 In support of her position, Johnson relies on an Oregon case in which the plaintiff was badly burned after accidentally falling into hot springs on the defendant’s land.
Van Gordon v. Portland Gen. Elec. Co.,
¶ 14 In addition, the court found Rule 407 inapplicable because, before posting the signs, the defendant “did not know of the accident and was motivated to change the signs simply for aesthetic reasons,” not in response to the plaintiffs accident. Id. at 1290. The court concluded that “a defendant must know of the prior event in order to fashion a safety measure to remedy any hazard that caused the event.” Id. at 1289; see also 23 Charles Alan Wright & Kenneth W. Graham, Jr., Federal Practice and Procedure § 5283 (1980) (“[I]t is difficult to see how [remedial measures taken without knowledge of the accident] could be construed as an admission of negligence with respect to the particular accident and the decision to make the change could not have been affected by fear of liability to the instant plaintiff.”).
¶ 15 We disagree with this dictum in
Van Gordon,
as did the Iowa Supreme Court in
Johnston. See
¶ 16 In sum, we hold that Rule 407 requires the exclusion of evidence of subsequent measures to prove a party’s negligence or culpable conduct, even when such measures are taken without specific knowledge of the accident in question. Because the evidence of the State’s post-accident signage fell within Rule 407, Johnson was not permitted to introduce the evidence unless it was “offered for another purpose.” Ariz. R. Evid. 407. We next address that issue.
III
¶ 17 Although Rule 407 excludes evidence of subsequent measures to prove negligence or culpability, the rule does not require exclusion of such evidence “when offered for another purpose, such as proving ownership, control, or feasibility of precautionary measures, if controverted, or impeachment.” Ariz. R. Evid. 407. Here, the State did not contest its ownership and control of Highway 60 or the feasibility of installing warming signs at or near the Peckary Road intersection. But Johnson argues that evidence of the State’s subsequent measures should have been admitted to “(a) impeach the adverse witnesses; (b) rebut the argument that the intersection was faultless; and (e) fight the defense of contributory negligence.” We review a trial court’s ruling on the admissibility of evidence under Rule 407 for abuse of discretion.
Robles v. Shoreside Petroleum, Inc.,
¶ 18 Courts have differed on whether evidence of subsequent measures should be admissible to rebut a defendant’s denial of fault or allegations of a plaintiffs contributory negligence. Some courts have allowed admission of such evidence for those or similar purposes.
See, e.g., Pitasi v. Stratton Corp.,
¶ 19 In contrast, many courts have concluded that evidence of subsequent remedial measures is not admissible merely because defendants dispute their liability, allege contributory negligence, or argue that existing designs, standards, or conditions were adequate.
See, e.g., Kelly v. Crown Equip. Co.,
¶ 20 For example, in
Herzog,
the plaintiff sued the township following a ear accident, arguing that a single “winding road” sign was insufficient to wain motorists of a series of curves on the road where he was injured.
¶ 21 The Illinois Supreme Court affirmed the trial court’s ruling, concluding that “evidence is not admissible for impeachment where the sole value of the impeachment rests on [the] same impermissible inference of prior negligence.”
Id.
at 933. It reasoned that allowing evidence of subsequent remedial measures “under the guise of impeachment” whenever a defendant disputes the plaintiffs negligence claim “would swallow the general rule prohibiting the introduction of subsequent remedial measures and frustrate the policy considerations that support it.”
Id.; see also Hallmark,
¶ 22 We find this latter line of eases persuasive. The mere fact that a defendant denies fault and alleges comparative negligence does not, alone, justify the admission of subsequent measure evidence for impeachment purposes.
See Tuer v. McDonald,
¶23 Evidence of subsequent measures may be admissible for impeachment purposes, however, when “the defendant goes beyond stating that the original condition was safe or adequate, and attempts to make exaggerated claims that the condition was the ‘safest possible.’ ”
Herzog,
¶ 24 Here, the State made no such exaggerated claims about the safety of the intersection. In its opening statement, the State
¶ 25 The overarching purpose of Rule 407’s “impeachment” provision is to allow a party to refute evidence that, if left uncontroverted, would create an unfair advantage or misleading impression for the other party who seeks to exclude any evidence of subsequent measures.
Minter v. Prime Equip. Co.,
IV
¶ 26 For the reasons stated above, we affirm the trial court’s judgment in favor of the State and vacate the court of appeals’ opinion.
Notes
. We view the facts in the light most favorable to upholding the jury’s verdict.
Hutcherson v. City of Phoenix,
. Although Johnson sued multiple defendants, the evidence of subsequent signage would have been probative only on the question of the State’s liability. Moreover, the jury returned verdicts in favor of all defendants. Therefore, to the extent the evidence allegedly refuted the State’s denial of fault and affirmative defenses, it would have served to increase only the State’s liability.
. As the court of appeals correctly concluded, admitting evidence of subsequent signage to prove the State’s knowledge of a dangerous condition "would have allowed [Johnson] to explicitly prove elements of negligence with evidence of subsequent remedial measures,” a purpose clearly prohibited by Rule 407.
Johnson, 222
Ariz. at 65 ¶ 26,
