Starting September 30, 2025, drivers in Arizona who own electric or other alternative fuel vehicles may lose their ability to use high-occupancy vehicle (HOV) lanes during restricted hours—unless Congress acts to extend a federal provision that currently allows that access.

The Federal Highway Administration has notified the state that a key provision in federal code is set to expire. That provision (23 USC 166b) permits states like Arizona to exempt certain alternative fuel vehicles (AFVs) from the usual HOV rules, which require at least two occupants per vehicle during peak hours.

Unless the federal code is renewed, vehicles with an AFV or Energy Efficient license plate will no longer be eligible for solo-driver access to HOV lanes after the September deadline.

This change would primarily affect drivers commuting on Phoenix-area freeways, where HOV lanes are currently used to ease congestion during rush hours. It could also impact residents in communities like San Tan Valley, where many commuters travel into the Valley each day for work and have opted for electric or clean fuel vehicles.

To help drivers prepare, the Arizona Department of Transportation (ADOT) has launched a dedicated webpage at azdot.gov/HOVRule. The site outlines what's changing, answers common questions, and provides updates for vehicle owners, dealers, and anyone considering purchasing an alternative fuel vehicle.

Eligible vehicles currently include those that run solely on electricity, natural gas, propane, hydrogen, methanol, and certain biofuels, among others. Motorcycles will remain exempt from occupancy requirements regardless of changes to the rule.

ADOT's Motor Vehicle Division is also working to notify affected drivers and local auto dealers to ensure consumers are aware of the potential change before making vehicle purchase decisions.

While this is a federal-level issue, the outcome will directly affect Arizona drivers, especially those who rely on the HOV lane to shorten daily commutes.

For more information, visit azdot.gov/HOVRule or check out ADOT's HOV resources explaining current lane rules, permitted vehicles, and frequently asked questions.