Arizona drivers of electric vehicles (EVs) and alternative fuel vehicles (AFVs) may lose access to high-occupancy vehicle (HOV) lanes during restricted hours starting September 30, 2025, if a federal exemption is not renewed. The change could impact thousands of commuters across the Phoenix area who currently enjoy solo access to HOV lanes as a benefit of driving eco-friendly vehicles.
The Arizona Department of Transportation (ADOT) has launched a new website at azdot.gov/HOVRule to help residents prepare for the possible change.
Why Arizona’s HOV Access Rules Are Changing
A provision in federal law—Title 23 U.S. Code §166(b)—currently allows states to let single-occupant alternative fuel vehicles use HOV lanes. Arizona has used this exemption to promote low-emission vehicle adoption by granting solo access to eligible vehicles.
Which Vehicles Are Affected?
The exemption applies to vehicles powered by:
- Electricity (electric vehicles or EVs)
- Natural gas
- Propane
- Hydrogen
- Methanol or ethanol (alcohol-based fuels)
- Coal-derived or biologically derived liquid fuels
Unless Congress extends this federal provision, Arizona will no longer be allowed to let AFVs use HOV lanes with only one occupant starting September 30, 2025.
What Arizona EV and AFV Drivers Need to Know
Current HOV Lane Access Rules in Phoenix
Today, HOV lanes in the Phoenix metro area are open during restricted hours to:
- Vehicles with two or more occupants
- Motorcycles
- Single-occupant alternative fuel vehicles (under current exemption)
What Happens If the Exemption Expires?
If the federal exemption lapses:
- Electric and alternative fuel vehicles will need two or more occupants to use HOV lanes during restricted hours.
- Alternative Fuel and Energy Efficient license plate holders will lose their solo HOV access.
- Auto dealers must inform customers about the policy change.
How to Stay Informed About HOV Lane Changes
ADOT has launched azdot.gov/HOVRule, a dedicated resource for:
- Understanding who qualifies for HOV lanes
- Reviewing current and proposed HOV policies
- Tracking federal updates
- Getting guidance on AFV license plates and vehicle eligibility
This change impacts not only current EV and AFV drivers, but also potential buyers, auto dealerships, and businesses in the electric and alternative fuel space.
Key Takeaways for Phoenix-Area Commuters
- The current HOV lane exemption for alternative fuel vehicles is set to expire on September 30, 2025.
- The decision to renew or end the exemption lies with Congress, not the State of Arizona.
- ADOT encourages all drivers to visit azdot.gov/HOVRule to stay informed and prepare for any changes.
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