Tracking daily travel; Assessing discrepancies between GPS-derived and self-reported travel patterns |
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Institution: | 1. Institute for Transport Studies & Choice Modelling Centre, University of Leeds, UK;2. KDD Lab. - Istituto ISTI - Area della Ricerca CNR di Pisa, Italy;1. Institute for Transport Studies, University for Natural Resources and Life Sciences, Peter-Jordan-Strasse 82, 1190 Vienna;2. ZIS+P, Transport Consulting Ltd, Graz, Vienna, Austria;3. Herry Consult Ltd, Vienna, Austria |
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Abstract: | Global Positioning Systems (GPS) technologies have been used in conjunction with traditional one- or two-day travel diaries to audit respondent reporting patterns, but we used GPS-based monitoring to conduct the first assessment to our knowledge of travel reporting patterns using a seven-day travel log instrument, which could reduce response burden and provide multiple-day, policy-relevant information for evaluation studies. We found substantial agreement between participant-reported daily travel patterns and GPS-derived patterns among 116 adult residents of a largely low-income and non-white transportation corridor in urbanized Los Angeles in 2011–2013. For all modes, the average difference between daily GPS- and log-derived trip counts was only about 0.39 trips and the average difference between daily GPS- and log-derived walking duration was about ?11.8 min. We found that the probability that a day would be associated with agreement or discrepancies between these measurement tools varied by travel mode and participant socio-demographic characteristics. Future research is needed to investigate the potential and limitations of this and other self-report instruments for a larger sample and a wider range of population groups and travel patterns. |
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Keywords: | Travel behavior Self-report Global Positioning Systems Travel survey data collection |
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