On-Board and Intercept Transit Survey Techniques (2005) / Chapter Skim
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Pages 9-17
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From page 9... ...
Planning an on-board/intercept survey requires defining project goals, choosing where and how to conduct the survey, identifying the study population and sampling frame, and deciding what degree of precision is needed in the results. This chapter addresses these issues.
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Response rates, computed as interviews completed as a percentage of persons approached, exceeded 80% for surveys conducted by MARTA, King County Metro, and Gulf Regional Planning Commission (GRPC, Gulfport, Mississippi)
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also offered the option of either self-administered or interviews; approximately 15% of riders completing the survey asked to be interviewed, primarily persons with disabilities that made self-completion difficult. A Fort Worth Transportation Authority survey was primarily selfadministered; however, a bilingual surveyor, assigned to bus routes with significant Hispanic ridership, conducted some interviews in Spanish.
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Some surveys are distributed by bus operators or are left on seats or in timetable holders. One-quarter of the on-board surveys reported by transit agencies involved bus operators distributing the questionnaires (including surveys distributed by a combination of bus operators and survey workers)
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The theoretical population in on-board and intercept transit surveys is typically composed of bus, rail, and other transit users. The theoretical population may be all riders or a subset such as riders on a particular route or traveling in a particular area or at a particular time of day.
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Surveys conducted at bus stops or rail stations typically define the sampling frame as stops or stations. For the light rail portion of the Denver-area Regional Transportation District (RTD)
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created a digital file of all bus trips and used computer software to randomly select bus trips to assign to survey workers for an on-board customer satisfaction survey. Similarly, for a systemwide survey, MARTA randomly selects 1,000 bus and rail trips to be surveyed each year.
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. Sampling Error Virtually all on-board and intercept transit surveys involve taking a sample of the study population and are thus subject to sampling error.
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However, one can attempt to evaluate and possibly compensate for nonresponse. The likely impact from nonresponse can be evaluated by comparing characteristics of respondents with those of the entire population or those within the sampling frame.
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