While we continue to work towards the long-term goal of using GPS technology to produce higher
quality trip files, the reality is that the current method of random samples, telephone surveys, and travel
logs continue to be used. Thus, for any given regional travel survey, trip underreporting will occur at
some level. The research question that forms the focus of this paper is whether an analysis of GPS data
collected as part of a regional travel survey can be used to minimize trip under-reporting through
improved survey methods. The focus is on demographic characteristics, travel behavior characteristics,
and indicators of adherence to survey protocol that potentially impact trip under-reporting. The results
suggest that while more research into this subject is warranted, there are specific, low-cost changes to the
survey materials as well as the interviewing process that can be made immediately to reduce trip underreporting
While we continue to work towards the long-term goal of using GPS technology to produce higherquality trip files, the reality is that the current method of random samples, telephone surveys, and travellogs continue to be used. Thus, for any given regional travel survey, trip underreporting will occur atsome level. The research question that forms the focus of this paper is whether an analysis of GPS datacollected as part of a regional travel survey can be used to minimize trip under-reporting throughimproved survey methods. The focus is on demographic characteristics, travel behavior characteristics,and indicators of adherence to survey protocol that potentially impact trip under-reporting. The resultssuggest that while more research into this subject is warranted, there are specific, low-cost changes to thesurvey materials as well as the interviewing process that can be made immediately to reduce trip underreporting
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