1. Professor of Civil Engineering, Nottingham Transportation Engineering Centre, Univ. of Nottingham, NG7 2RD, U.K.
2. Senior Research Scientist, Australian Road Research Board, 500 Burwood Highway, Vermont South, VIC 3133, Australia.
3. Associate Professor and Reader in Civil Engineering, Nottingham Transportation Engineering Centre, Univ. of Nottingham, NG7 2RD, U.K.