Moreover, participants need to remember to carry an extra device
during the travel interval and also upload the collected travel logs to the server, which cause
a burden on them. In addition, since all handheld GPS loggers need battery to run and for
most cases their battery needs to be charged or replaced during the survey period, an extra
burden will be forced on respondents and even may change their real behaviour. Finally,
some GPS loggers, specially low-cost devices, need to be placed on a flat surface with a
clear view of the sky to have enough sensibility in obtaining GPS data of respondent for
travel attributes‟ detection. While most of the time in real travel patterns, for instance when
Moreover, participants need to remember to carry an extra deviceduring the travel interval and also upload the collected travel logs to the server, which causea burden on them. In addition, since all handheld GPS loggers need battery to run and formost cases their battery needs to be charged or replaced during the survey period, an extraburden will be forced on respondents and even may change their real behaviour. Finally,some GPS loggers, specially low-cost devices, need to be placed on a flat surface with aclear view of the sky to have enough sensibility in obtaining GPS data of respondent fortravel attributes‟ detection. While most of the time in real travel patterns, for instance when
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