Carpooling and Vanpooling in San Mateo County, California

This program used advertising (online, video, and display), challenges, and prize-based campaigns to attract and retain its target audience. It also made its standard Guaranteed Ride Home system easier to use. This case study illustrates the timing of incentives to promote habit formation. It also exemplifies how benefits can be increased by integrating some of the participant-facing aspects of multiple, independent programs in neighboring regions.Over about six months from the Fall of 2018 to Spring 2019,'s Carpool 2.0 program led to a quadrupling of carpools logged in San Mateo County through its Star commuter platform each month, from 6,400 in to nearly 30,000. Between October 2018 and December 2019, the program rewarded 1,961 carpoolers, making 218,453 one-way trips, travelling 4,708,310 miles, and saving $1,325,860. About 40% of program participants drove alone before the program, and 33% reported costs savings as their top motivation to carpool. There was an associated reduction of 955 tons of CO2 emissions (about 819 tons per year.)


This case study is undergoing a final edit before being posted.

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