1. Group Engineer, Atkins Highways and Transportation, The Axis, 10 Holliday St., Birmingham, B1 1TF, U.K.
2. Senior Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Auckland, Private Bag 92019, Auckland, New Zealand.
3. Professor of Highway Engineering, Civil Engineering, School of Engineering, Univ. of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.