1 This study introduces a new smartphone-based system for performing personal travel data 2 collection. The system, SITSS (Smartphone-based Individual Travel Survey System), is designed 3 to deal with the challenges associated with applying smartphones in real-world travel surveys, 4 including battery depletion, participant’s involvement and privacy concerns. A prompted-recall 5 smartphone-based data collection approach was employed in the development of SITSS to 6 facilitate the procedure of data collection while improving the accuracy of collected data. The 7 system was employed as a part of the national household travel survey of New Zealand to 8 investigate the various aspects of performing a national level travel survey using smartphone. 9 The study confirmed the successful performance of SITSS in a multi-day travel survey. 10 Participants found the data collection procedure as an interesting experience, and 71% of them 11 continued their participation beyond the expected data collection interval. Participants found the 12 procedure of data collection fairly straightforward and 94% of them could complete the task 13 without any support request. In addition, it was found that the smartphone application did not 14 interrupt participants’ interaction with their smartphones. The battery saving algorithms 15 employed in the application could satisfactorily preserve the battery life of the smartphone. The 16 study also addressed other challenges associated with implementing SITSS, including the 17 procedure for labeling trips, respondent’s experience with the data collection method, and 18 concerns related to the performance of the smartphone application. 19 Safi, Assemi, Mesbah, Ferreira, and Hickman 3
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