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BART, the 71-mile Bay Area Rapid Transit System, serving San Francisco, Oakland, Berkeley, and their suburbs, is the first regional-scale rapid transit system to open in the United States in over 50 years. This report is one of a series assessing the impacts of BART on transportation and travel in the Bay Area. It describes the methods and results of a survey of 8,400 persons employed in the areas most accessible by BART. The sample represents 506,000 daily work trips to the survey area. A novel sampling design was used in which self-completion questionnaires were distributed to workers at their workplaces. Detailed information was obtained on the travel mode choices available to workers, the characteristics of their journey-to-work alternatives, and the reasons for their mode choices. BART's share of journey-to-work trips into the survey area from residences in the primary BART service areas is 18%; bus, 16%; and automobile, 66%. The BART share varies greatly for specific origin-to-destination corridors and trip lengths; BART's highest share is for long-distance commute trips to downtown areas. Of all trips from residences in the primary service area, respondents considered 40% to be possible by BART; BART presently carries about 40% of these possible trips, which suggests a high potential for increased patronage. Typically, relative travel times and reliability of service are among the most important determinants of travelers' mode choices.