California law requires certain employers who provide free parking to their workers to also offer cash in lieu of the parking. The goal is to provide workers an incentive to use transportation alternatives to driving alone. The Air Resources Board has conducted little outreach to make employers aware of the program. Additionally, there are no statewide data on the effectiveness of the program. We recommend that the board (1) conduct outreach to all firms with 50 or more employees and (2) perform periodic surveys to assess the program's effectiveness.