1. Lecturer, Dept. of Architecture and Civil Engineering, Univ. of Bath, Bath, BA2 7AY, UK.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA 94720.
3. Associate Professor, Dept. of Civil Engineering, Univ. of California, Davis, CA 95616.
4. Associate Research Engineer, Pavement Research Center, Univ. of California, 1353 S 46th St., Richmond, CA 94804.