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http://dx.doi.org/10.12815/kits.2016.15.2.050

Testing the Reliability of a Smartphone-Based Travel Survey: An Experiment in Seoul  

Lee, Jae Seung (Hongik University)
Zegras, P. Christopher (Massachusetts Institute of Technology, Department of Urban Studies and Planning)
Zhao, Fang (Singapore-MIT Alliance for Research and Technology, Future Urban Mobility Group)
Kim, Daehee (Hongik University)
Kang, Junhee (Hongik University)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.15, no.2, 2016 , pp. 50-62 More about this Journal
Abstract
With programmable applications that utilize sensors, such as global positioning systems and accelerometers, smartphones provide an unprecedented opportunity to collect behavioral data in an unobtrusive and cost-effective manner. This paper assesses the relative accuracy and reliability of the Future Mobility Sensing (FMS), a smartphone-based prompted-recall travel survey. We compared the data extracted from FMS with the data collected from the Korea Passenger Trip Survey (PTS), a traditional self-reported, paper-based travel survey. In total, 46 undergraduate students completed the PTS for seven consecutive days, while also carrying their smartphones with the activated FMS applications for the same time span. After completing the PTS, the participants validated their FMS data on the web-based prompted recall surveys. We then matched the validated FMS data with the PTS-based records. The FMS turns out to be superior in detecting short trips, which are usually under-reported in self-reported travel surveys. The reported PTS travel times are longer than for the FMS, suggesting that participants tend to overestimate their travel time in the PTS. This study contributes to the ongoing development of smartphone-based travel behavior data collecting methods.
Keywords
Travel Survey Method; Smartphone; Number of Trips; Travel Time; GPS;
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