Motorcycle Accident Lawyer in Phoenix and Across Arizona

Arizona's Helmet Law: What A.R.S. § 28-964 Actually Requires

Arizona's motorcycle equipment statute is A.R.S. § 28-964. Under it, a person under the age of eighteen must wear a protective helmet while operating or riding on a motorcycle. Riders eighteen and older are not required by state law to wear one.

The same statute addresses eye protection: a rider must wear protective glasses, goggles, or a transparent face shield unless the motorcycle is equipped with a protective windshield. That requirement is not limited to minors, and it is the part of § 28-964 that riders most often overlook.

One point deserves emphasis because insurers blur it constantly: for a rider eighteen or older, not wearing a helmet is not a violation of Arizona law and cannot establish that the rider caused the collision. A helmet does not affect who ran the red light, who turned left across your path, or who drifted out of their lane. Liability for the crash and the question of injury severity are separate inquiries, and the first one is not touched by headgear.

How Helmet Non-Use Interacts With Comparative Fault

Arizona uses pure comparative fault under A.R.S. § 12-2505. Fault is apportioned by percentage and the award is reduced accordingly, with no fifty-percent cutoff.

Because a rider over eighteen violates no statute by riding without a helmet, non-use cannot be negligence per se. What insurers attempt instead is an argument about damages: that a head injury would have been less severe with a helmet, and that the rider should therefore bear part of the responsibility for the extent of the harm rather than for the crash. Arizona courts have addressed the analogous seat belt question, and defendants routinely try to extend that reasoning to helmets. Whether and how far the argument goes is litigated case by case, and it depends heavily on the medical proof — an orthopedic injury to the pelvis or the lower extremities has nothing to do with a helmet at all.

Three practical consequences follow. First, the argument only ever reaches damages, never liability, so it does not defeat a claim. Second, it is a medical question that requires expert support, not an adjuster's assertion in a phone call. Third, it applies only to the specific injuries plausibly connected to head protection.

If an adjuster opens by telling you your claim is worth little because you were not wearing a helmet, that is a negotiating position, not a statement of Arizona law. Our post on talking to the insurance adjuster explains why those early conversations are recorded and how they are used.

Lane Splitting vs. Lane Filtering Under Current Arizona Law

These two terms describe different maneuvers, and Arizona treats them differently. Getting the distinction right matters, because insurers frequently label any between-lanes movement "lane splitting" and treat it as automatically illegal.

Lane splitting — riding between lanes of traffic that is moving — is not permitted in Arizona.

Lane filtering is narrower and is permitted under conditions set out in A.R.S. § 28-903. A motorcycle may overtake and pass a stopped vehicle in the same lane, or move between lanes of stopped vehicles, only when all of the following are true: the roadway has at least two adjacent traffic lanes in the same direction of travel; the posted speed limit is forty-five miles per hour or less; the vehicles being passed are stopped; and the motorcycle is traveling at fifteen miles per hour or less. Outside those conditions, the maneuver is not authorized.

A.R.S. § 28-903 also confirms the rule riders rely on most: a motorcycle is entitled to full use of a lane, and no other vehicle may deprive the rider of it. Passing a motorcycle within the same lane, or squeezing a rider toward the line, is not permitted.

Even where a rider was doing something they should not have been, Arizona's pure comparative fault rule still applies. An unlawful maneuver may increase the rider's assigned percentage; it does not end the case or transfer one hundred percent of the fault automatically. That determination belongs to the finder of fact after both sides' conduct is examined.

The Crash Patterns: Left Turns, Blind Spots, and Intersections

The single most common serious motorcycle collision is the left-turn crash: a driver turning left across the rider's path at an intersection or a driveway. Under A.R.S. § 28-772, a driver intending to turn left within an intersection or into an alley or driveway must yield the right-of-way to any vehicle approaching from the opposite direction that is so close as to constitute an immediate hazard. A motorcycle is a vehicle for that purpose, and the duty does not soften because the approaching vehicle is small.

The explanation drivers give — "I never saw the motorcycle" — is not a defense. Arizona drivers have a duty to maintain a proper lookout for other traffic, and failing to see what is plainly there is itself a failure of that duty.

Other recurring patterns:

• Unsafe lane changes into a rider occupying an adjacent lane, a blind-spot problem magnified by the motorcycle's narrow profile.
• Following too closely, which at freeway speeds leaves the rider no room to be seen or avoided during a sudden stop.
• Vehicles pulling out from side streets, parking lots, and commercial driveways after misjudging an approaching motorcycle's speed and distance.
• Road hazards — gravel, uneven pavement joints, sunken utility covers, unmarked construction transitions — that a car absorbs and a motorcycle does not. Where the hazard is on a public roadway, the responsible entity may be a governmental one, which triggers the 180-day notice of claim requirement in A.R.S. § 12-821.01 rather than the usual two-year window under A.R.S. § 12-542.
• Left turns and cross traffic at the metro's high-volume arterial intersections. Our review of Phoenix's most dangerous intersections covers where those conflicts concentrate.

Bias Against Riders — and How It Is Answered

Rider bias is real, and it shows up long before a jury is ever selected. It shows up in the adjuster's first evaluation, in the assumption that a motorcycle must have been speeding, in the phrase "he chose a dangerous hobby," and in the reflexive attribution of fault to the smaller, louder vehicle.

The answer is documentation, not argument:

• Scene evidence. Skid and scuff marks, debris fields, final rest positions, and vehicle damage geometry establish speeds and points of impact that contradict the assumed narrative.
• Independent data. Many passenger vehicles record pre-crash speed, braking, and throttle in their event data recorder. Nearby business and residential cameras, traffic signal timing records, and 911 call audio all age out quickly and should be requested early.
• The rider's own conduct. Licensing and endorsement, rider training completion, conspicuity, and lighting all rebut the assumption of recklessness when they are established affirmatively rather than defended reactively.
• Medical documentation. Motorcycle injuries — open fractures, degloving and road rash requiring debridement or grafting, traumatic brain injury, spinal injury — need to be documented in a way that conveys the treatment burden, not just a diagnosis code.

On damages, Arizona has no statutory cap on compensatory damages: the Arizona Constitution, Article 2, Section 31, prohibits laws limiting recoverable damages for causing death or injury. Recoverable categories include past and future medical expenses, lost income and loss of earning capacity, pain and suffering, disfigurement, permanent impairment, and loss of consortium in serious cases. Medical liens under A.R.S. § 33-931 and health plan reimbursement claims are resolved out of the recovery — see how medical liens work and how case value is actually assessed.

Insurance Coverage, Deadlines, and First Steps

Motorcycle injuries frequently exceed the at-fault driver's liability limits, which makes coverage identification part of the liability investigation rather than an afterthought.

• Uninsured and underinsured motorist coverage. Arizona insurers must offer UM and UIM coverage under A.R.S. § 20-259.01. UIM applies when the at-fault driver's limits are insufficient; UM applies when there is no coverage at all, including certain hit-and-run situations. Coverage may exist on the rider's own motorcycle policy and, depending on policy language, on other household policies.
• Medical payments coverage, where purchased, pays regardless of fault and can carry early treatment.
• Health insurance, AHCCCS, and Medicare typically pay in the interim and then assert reimbursement rights against the settlement.
• Commercial policies, when the at-fault vehicle was a work vehicle, a rideshare vehicle, or a delivery vehicle — often with substantially higher limits.

The deadline is two years under A.R.S. § 12-542 for injury claims, and two years from the date of death for a wrongful death claim. Claims involving a city, county, or state entity require a written notice of claim within 180 days under A.R.S. § 12-821.01, with suit filed within one year under A.R.S. § 12-821. UM/UIM claims are governed by the policy's own contractual requirements, including notice and consent-to-settle provisions that can forfeit coverage if a liability claim is settled without the carrier's agreement.

First steps after a crash are covered in the first 24 hours after a crash and what to do after an accident in Arizona, in Spanish. Related pages: car accidents, truck accidents, and pedestrian and bicycle accidents.