TRANSPORT STUDIES

ABSTRACT: Global Positioning System devices are emerging as a potential means to collect improved data on the spatial aspects of personal travel. In many applications, the GPS device is coupled with a Personal Data Assistant of some type and the respondent who is using the GPS device is required to enter various data items at the start of each trip made with the device. This procedure has the disadvantage that it relies on the memory of the respondent to use the PDA, and also is subject to being missed if the respondent is in a hurry. This paper builds on earlier work by Stopher and others to develop a passive GPS device, for which additional non-GPS data may be added either through inference or through a subsequent prompted recall survey. The paper describes the use of both in-vehicle and personal versions of a GP