HOV lanes; degradation; technical correction

Arizona's SB 1550 amends Arizona Revised Statutes § 28-337 to clarify how high occupancy vehicle (HOV) lanes are managed when traffic slows. It defines "degradation" as lanes failing to maintain 45 mph for 90% of weekday peak hours over 180 days, triggering restrictions. When degradation occurs, the lane reverts to priority use: first vehicles with two or more occupants, then transit buses, multi-occupant buses, motorcycles, and low-emission vehicles. This technical correction directly affects drivers using HOV lanes and the Arizona Department of Transportation, which must enforce these rules. The bill does not create new policy but standardizes existing enforcement criteria.