Literature Review
The employment of GPS data in travel surveys began with a series of demonstration studies
designed to prove the possibility of using GPS data for identifying travel patterns, and has
expanded to several more advanced applications (e.g. André (1997) Ohmori, Y et al. (1998)
Murakami and Wagner (1999). With the success of these initial studies, GPS devices were
widely used in other household travel surveys. Most of initial GPS-assisted travel surveys
employed vehicle-based GPS method, and technological improvements handheld GPS
devices were employed as well for performing travel surveys