1. Vehicle Uses and Operating Conditions: On Board Measurement;Andre,1997
2. Monitoring Travel Behaviour using PHS Based Location Positioning Service System;Asakura,1999
3. Can We Ever Obtain the Data We Would Like to Have?;Axhausen,1998
4. Lexington Area Travel Data Collection Test: Global Positioning Systems for Personal Travel Surveys;Battelle Transportation Division;Final Report to FHWA (Federal Highway Administration),1997