MANDATORY TRIP REDUCTION IN SOUTHERN CALIFORNIA: FIRST YEAR RESULTS

Trip reduction policies in the U.S. focus on the journey to work and are aimed at reducing the amount of drive-alone commuting by providing transit and ridesharing incentives. Severe air quality problems in Southern California have prompted the air pollution control agency for the Los Angeles metropolitan area to enact Regulation XV which requires employers to develop and implement a trip reduction program to achieve specified ridesharing goals. It is the most ambitious and far reaching such program implemented to date, and offers a unique opportunity to determine whether such programs can significantly affect travel behavior. This paper presents results from the first year of Regulation XV's implementation.