Another motivation for transportation mode detection is
transportation surveys. Travel demand surveys have taken multiple
formats, such as telephone interviews and questionnaires. These
data collection strategies rely on manual labeling of data after the
trip, and thus, inaccuracies are introduced. For example, a traveler
may not recall the exact time that she/he boarded a transportation
mode. Using GPS devices is more reliable for reporting accurate
location, trip time, and trip duration [12, 13, 14]. Hence, if the
precise transportation modes of individual users are recognized, it
is possible to provide a more realistic travel demand picture