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California's Clean Air Vehicle (CAV) decal program, which has provided solo access to high-occupancy vehicle (HOV) lanes for electric vehicles (EVs) since 1999, is set to expire on September 30, 2025, unless federal lawmakers intervene. This program has been pivotal in encouraging the adoption of low- and zero-emission vehicles, with over 1.1 million decals issued and more than a million registered EVs in the state. However, the increasing number of solo EV drivers has led to congestion in HOV lanes, undermining their original purpose of promoting carpooling.

Federal regulations under Title 23 of the U.S. Code limit the duration of such programs, and without congressional action, the impending expiration could reshape traffic patterns and EV incentives. Transportation experts suggest that this shift may alleviate overcrowding in HOV lanes, potentially reducing freeway congestion by 5-10% in areas like Los Angeles and the Bay Area.

The expiration of the decal program poses risks to California's ambitious electrification goals, including a mandate to phase out gas-powered vehicle sales by 2035. Analysts estimate that HOV access has influenced approximately 20% of recent EV purchases, and the loss of this incentive could dampen the appeal of EVs, particularly among urban professionals.

Bipartisan proposals in Congress aim to extend the program, supported by lobbying from automakers like Tesla and Ford. In the absence of renewal, alternative strategies, such as income-based HOV exemptions or high-occupancy toll (HOT) systems, are being explored to balance incentives and infrastructure demands.

As California navigates this critical juncture, the state's experience may offer valuable insights for national transportation policy and the future of EV adoption.