The main purpose of this legislation is to extend the authorization for certain alternative fuel and clean vehicles to use high occupancy vehicle (HOV) lanes. HOV lanes are designated lanes on highways meant to encourage carpooling and reduce traffic congestion. This bill aims to support the use of environmentally friendly vehicles by allowing them continued access to these lanes. Key provisions of the legislation include a specific amendment to an existing law that changes the expiration date for the authorization of alternative fuel and clean vehicles to use HOV facilities.