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Arizona State Law Library · Guide 23 of 23

Arizona Crash & Auto Insurance Case Authority Library

A research map of leading Arizona appellate decisions governing negligence, comparative fault, automobile insurance, UM/UIM coverage, policy interpretation, insurance bad faith, MedPay, wrongful death, settlements, releases and vehicle product-liability claims.

Case-law check: Sept. 13, 2026 Arizona Supreme Court emphasized 2026 decisions included Guide 23 of 23

How to use this authority library

This page is a starting point for Arizona crash-law research. It is organized by doctrine rather than alphabetically so a reader can move from a legal issue to the cases that define the controlling rule.

Step 1

Find the doctrine

Begin with the issue involved in the crash: fault, coverage, damages, settlement, wrongful death, insurer conduct or another recurring Arizona question.

Step 2

Read the actual opinion

A case summary identifies the rule. The full opinion establishes the facts, limits, procedural posture and language that actually controls.

Step 3

Check current statutes

A later statute can change the practical effect of an older case. Always compare case authority to the current Arizona Revised Statutes.

September 2026 statutory update warning: Arizona's 57th Legislature, Second Regular Session had a general effective date of September 12, 2026. The Legislature's online A.R.S. compilation may lag the newly effective session laws. For current legal research, compare the codified statute with applicable 2026 session laws.
Authority hierarchy: Arizona Supreme Court decisions carry the greatest state precedential authority. Published Arizona Court of Appeals decisions are also precedential unless displaced or modified by later controlling authority. Unpublished memorandum decisions should not be treated as ordinary precedential authority.

Current Arizona developments: 2023–2026

Arizona's Supreme Court has recently issued several decisions of direct importance to automobile coverage and crash litigation. These decisions should be checked first when researching the subjects they address.

State Farm Mutual Automobile Insurance Co. v. Balzan
Arizona Supreme Court · CV-24-0140-PR · July 6, 2026
UIM Stacking A.R.S. § 20-259.01(H)

Interprets Arizona's UM/UIM anti-stacking statute and the phrase "purchased by one insured." Multiple named insureds who jointly procure policies may constitute the statutory "one insured" for purposes of a compliant anti-stacking limitation.

Maywald v. Toyota Motor Corporation
Arizona Supreme Court · CV-25-0009-PR · July 7, 2026
Product Liability Vehicle Design Crash Causation

Reaffirms that an Arizona strict-products-liability plaintiff must establish both a defect and that the defect made the product unreasonably dangerous. The risk-benefit analysis examines the product as actually designed rather than simply comparing it with a proposed safer alternative.

State Farm Automobile Insurance Co. v. Orlando
Arizona Supreme Court · CV-23-0228-PR · May 29, 2025
UIM Off-Road Vehicle

Holds that Arizona's UM/UIM Act does not require UIM coverage for an off-road ATV accident occurring off public roads. An insurer may define the policy to exclude that risk.

Franklin v. CSAA General Insurance Co.
Arizona Supreme Court · CV-22-0266-CQ · July 28, 2023
UIM Stacking Multiple Vehicles

Holds that a single policy insuring multiple vehicles provides separate UIM coverages for purposes of Arizona's stacking statute. An insurer seeking to prohibit stacking must use the method authorized by A.R.S. § 20-259.01(H).

Research sequence for stacking: start with Franklin, then read Balzan, and compare the policy language with the current version of A.R.S. § 20-259.01(H).

Negligence, duty and allocation of fault

Gipson v. Kasey
214 Ariz. 141, 150 P.3d 228 (2007)
Negligence Duty

A foundational modern Arizona negligence decision. Duty is a legal question for the court and is distinct from breach and causation. Foreseeability is not used to determine whether a legal duty exists.

Quiroz v. ALCOA Inc.
243 Ariz. 560, 416 P.3d 824 (2018)
Duty Foreseeability

Reinforces Arizona's separation of duty from foreseeability. Arizona generally recognizes duties based on legally recognized relationships or public policy rather than merely because harm was foreseeable.

Young v. Beck
227 Ariz. 1, 251 P.3d 380 (2011)
Family Purpose Doctrine Vehicle Owner Liability

Confirms the continued viability of Arizona's family-purpose doctrine and rejects the argument that Arizona's comparative-fault statutes abolished the doctrine.

Ontiveros v. Borak
136 Ariz. 500, 667 P.2d 200 (1983)
Negligence Causation Alcohol

Important Arizona negligence and causation authority arising from an alcohol-related motor-vehicle collision. The decision also abolished the former common-law rule of tavern-owner nonliability. Current alcohol-provider liability must also be analyzed under Arizona's later statutory dram-shop framework.

Statutory companion: A.R.S. §§ 12-2505 and 12-2506 govern comparative negligence and allocation of fault. Arizona generally reduces a claimant's recovery according to claimant fault and imposes several rather than joint liability, subject to statutory exceptions.

Uninsured and underinsured motorist coverage

Cundiff v. State Farm Mutual Automobile Insurance Co.
217 Ariz. 358, 174 P.3d 270 (2008)
UIM Workers' Compensation

Arizona's UIM statute did not permit the insurer to reduce UIM coverage by workers' compensation benefits received by the insured.

Taylor v. Travelers Indemnity Co. of America
198 Ariz. 310, 9 P.3d 1049 (2000)
UIM Same Policy

Holds that an insured injured by another insured under the same automobile policy could recover applicable UIM benefits, subject to credit for liability benefits recovered under that policy.

State Farm Mutual Automobile Insurance Co. v. Wilson
162 Ariz. 251, 782 P.2d 727 (1989)
UM/UIM Punitive Damages

Holds that UM/UIM coverage is designed to compensate for bodily injury and does not require payment of punitive damages assessed against the tortfeasor unless the insurer specifically contracted to provide that coverage.

Franklin v. CSAA General Insurance Co.
Arizona Supreme Court · July 28, 2023
UIM Intra-Policy Stacking

A multi-vehicle policy may contain separate UIM coverages for each insured vehicle, and an insurer seeking to restrict stacking must follow § 20-259.01(H).

State Farm Automobile Insurance Co. v. Orlando
Arizona Supreme Court · May 29, 2025
UIM ATV

Arizona's statutory UIM mandate does not require coverage for an off-road ATV accident occurring away from a public road.

State Farm Mutual Automobile Insurance Co. v. Balzan
Arizona Supreme Court · July 6, 2026
UIM Inter-Policy Stacking

Current Arizona Supreme Court authority interpreting the anti-stacking language authorized by § 20-259.01(H), including policies jointly procured by named insureds.

Insurance policy interpretation and reasonable expectations

Darner Motor Sales, Inc. v. Universal Underwriters Insurance Co.
140 Ariz. 383, 682 P.2d 388 (1984)
Policy Interpretation Reasonable Expectations

Foundational Arizona authority recognizing that standardized insurance-contract language may, in limited circumstances, yield to objectively reasonable expectations created by the transaction, representations or negotiated agreement.

Gordinier v. Aetna Casualty & Surety Co.
154 Ariz. 266, 742 P.2d 277 (1987)
Policy Interpretation Reasonable Expectations

Synthesizes Arizona's reasonable-expectations doctrine and identifies the limited circumstances in which even unambiguous standardized insurance language may not be enforced as written.

Do not reduce Arizona insurance analysis to "ambiguity equals coverage." The Arizona Supreme Court examines policy language, the purpose of the transaction, statutory policy and objectively reasonable expectations.

Insurance bad faith and insurer settlement duties

Noble v. National American Life Insurance Co.
128 Ariz. 188, 624 P.2d 866 (1981)
Bad Faith

Seminal Arizona Supreme Court authority recognizing the tort of first-party insurance bad faith when an insurer intentionally denies, fails to process or fails to pay a claim without a reasonable basis.

Rawlings v. Apodaca
151 Ariz. 149, 726 P.2d 565 (1986)
Bad Faith Good Faith Punitive Damages

Explains the insurer's implied duty of good faith and fair dealing. An insurer must act reasonably, investigate adequately and may not place its own interests above the protection the insured reasonably expected from the insurance relationship.

Deese v. State Farm Mutual Automobile Insurance Co.
172 Ariz. 504, 838 P.2d 1265 (1992)
Auto Insurance MedPay Bad Faith

Holds that breach of an express policy covenant is not necessarily a prerequisite to a tort claim for insurance bad faith. The case arose from State Farm's handling of an automobile MedPay claim.

Clearwater v. State Farm Mutual Automobile Insurance Co.
164 Ariz. 256, 792 P.2d 719 (1990)
Third-Party Bad Faith Failure to Settle

Applies Arizona's equal-consideration rule to an insurer's handling of settlement opportunities exposing its insured to an excess judgment. A first-party "fairly debatable" instruction does not define the third-party failure-to-settle standard.

United Services Automobile Association v. Morris
154 Ariz. 113, 741 P.2d 246 (1987)
Reservation of Rights Settlement

Establishes important Arizona rules permitting an insured defended under a reservation of rights to protect against personal exposure through a qualifying settlement without automatically violating the cooperation clause.

Taylor v. State Farm Mutual Automobile Insurance Co.
175 Ariz. 148, 854 P.2d 1134 (1993)
Release Bad Faith Contract Interpretation

Important authority concerning interpretation of a release and the use of extrinsic evidence to determine the meaning the parties intended to give contractual language.

Taylor v. State Farm Mutual Automobile Insurance Co.
185 Ariz. 174, 913 P.2d 1092 (1996)
Bad Faith Accrual Excess Judgment

Holds that a third-party bad-faith failure-to-settle action is a tort claim and addresses accrual when the insured is exposed to an excess judgment, adopting the final-judgment rule.

MedPay, subrogation and medical-provider liens

Allstate Insurance Co. v. Druke
118 Ariz. 301, 576 P.2d 489 (1978)
MedPay Subrogation

Foundational Arizona authority applying the state's rule against assignment or subrogation of personal-injury claims to an automobile insurer's attempt to obtain repayment of medical-payment benefits. A.R.S. § 20-259.01(J) later created a limited statutory MedPay lien for qualifying amounts above $5,000.

Dignity Health v. Farmers Insurance Co. of Arizona
247 Ariz. 39, 444 P.3d 743 (App. 2019)
Provider Lien MedPay Historical Statute

Interpreted the former version of A.R.S. § 33-931 and held that MedPay was not within the former statutory "health insurance" exclusion from provider liens.

Do not use Dignity Health as the current MedPay lien rule. The Legislature amended A.R.S. § 33-931 after that case. Current statutory language expressly excludes medical-payments coverage, UM coverage, UIM coverage and health-insurance proceeds from the claims reached by the ordinary statutory provider lien.

Wrongful death

Summerfield v. Superior Court
144 Ariz. 467, 698 P.2d 712 (1985)
Wrongful Death Statutory Interpretation

Major Arizona Supreme Court authority addressing the nature and interpretation of Arizona's statutory wrongful-death remedy.

Begay v. City of Tucson
148 Ariz. 505, 715 P.2d 758 (1986)
Wrongful Death Beneficiaries

Explains Arizona's one-action structure: one statutory wrongful-death action and judgment may include the separate damages suffered by multiple statutory beneficiaries.

Wilmot v. Wilmot
203 Ariz. 565, 58 P.3d 507 (2002)
Wrongful Death Settlement Fiduciary Duty

The statutory plaintiff represents all qualifying beneficiaries and owes fiduciary duties to them in conducting and settling the wrongful-death action.

Walsh v. Advanced Cardiac Specialists Chartered
229 Ariz. 193, 273 P.3d 645 (2012)
Wrongful Death Damages

An individual beneficiary is not automatically entitled to a monetary damages award merely because testimony concerning loss is uncontroverted. The jury retains its statutory role in determining what award is fair and just.

Settlement, releases and multiple tortfeasors

Dansby v. Buck
92 Ariz. 1, 373 P.2d 1 (1962)
Release Unknown Injury

Important Arizona authority concerning whether a personal-injury release encompasses an unknown injury and the intent of the parties when the agreement was made.

Shelby v. Action Scaffolding, Inc.
171 Ariz. 1, 827 P.2d 462 (1992)
Settlement Credit Comparative Fault UCATA

Interprets Arizona's Uniform Contribution Among Tortfeasors Act and addresses the interaction between settlement credits and comparative-fault principles.

Statutory companion — A.R.S. § 12-2504: releasing one tortfeasor does not automatically discharge another tortfeasor unless the terms of the agreement provide otherwise. The exact release language therefore remains critical.

Vehicle defects and crash product liability

Maywald v. Toyota Motor Corporation
Arizona Supreme Court · CV-25-0009-PR · July 7, 2026
Vehicle Design Strict Liability Negligent Design

The current Arizona Supreme Court framework requires a products plaintiff first to prove that the product was defective and then that the defect rendered the product unreasonably dangerous. A risk-benefit analysis focuses on the risks and benefits of the challenged product as actually designed.

Why Maywald belongs in a crash library: a vehicle collision may involve more than driver negligence. Vehicle design, restraints, tires, braking systems, steering, crashworthiness, automated safety systems and other products can create a separate liability inquiry. The July 2026 decision defines the current Arizona threshold for that analysis.

Quick research matrix

Issue Start with Then check
Basic negligence duty Gipson v. Kasey Quiroz v. ALCOA
Family vehicle liability Young v. Beck A.R.S. § 12-2506
Comparative fault A.R.S. §§ 12-2505–2506 Case law applying allocation to the facts
UIM stacking Franklin v. CSAA Balzan + § 20-259.01(H)
UIM offsets Cundiff Current § 20-259.01
Same-policy UIM Taylor v. Travelers Current policy + § 20-259.01
Policy interpretation Darner Gordinier
First-party bad faith Noble Rawlings and Deese
Failure to settle Clearwater Taylor v. State Farm
Reservation of rights settlement Morris Current coverage and procedural law
MedPay reimbursement Druke A.R.S. § 20-259.01(J)
Medical-provider lien A.R.S. §§ 33-931–33-937 Do not rely on pre-2023 lien law alone
Wrongful death Wilmot Begay, Walsh, §§ 12-611–613
Release interpretation Dansby Taylor (1993) + release text
Multiple tortfeasor settlement A.R.S. § 12-2504 Shelby
Vehicle design defect Maywald v. Toyota Arizona product-liability statutes and evidence

Research discipline: cases change meaning when statutes change

Arizona crash law is a combination of statutes and judicial decisions. A case may remain valid precedent for one proposition even though a later statute changes the practical outcome on another issue.

Example 1

Druke + MedPay

Druke remains important to Arizona's anti-subrogation doctrine, but § 20-259.01(J) later created a specific statutory MedPay lien for qualifying payments above $5,000.

Example 2

Dignity Health + provider liens

Dignity Health interpreted older § 33-931 language. The Legislature later amended the statute to expressly exclude MedPay, UM, UIM and health-insurance proceeds from the ordinary lien.

Example 3

Franklin + Balzan

Franklin explains separate UIM coverages within a multi-vehicle policy. Balzan adds current guidance about the statutory anti-stacking mechanism when multiple policies were jointly purchased.

Example 4

Old design cases + Maywald

Product-liability research involving vehicle safety systems should now begin with the Arizona Supreme Court's July 2026 Maywald formulation of defect and unreasonable danger.

Bottom line

Arizona crash law cannot be reduced to a single statute or insurance rule. Liability begins with Arizona negligence and comparative-fault principles; insurance disputes require the policy and A.R.S. § 20-259.01; insurer conduct brings Arizona's bad-faith cases into the analysis; serious injuries can implicate medical liens, wrongful death and settlement law; and some crashes require a separate product-liability investigation. Use this library to identify the governing doctrine, read the controlling opinion, compare it with the current statute, and verify that neither later legislation nor a newer appellate decision has changed the rule.

Public legal education only. This case library provides research orientation rather than a substitute for reading the controlling opinions, statutes and court rules. Case summaries necessarily omit facts and procedural limitations that may determine whether an authority applies. Arizona statutes should also be checked against recently enacted session laws before reliance, particularly during the period when the Legislature's online statutory compilation is being updated.