1. Built Environment Unit, CSIR, P.O. Box 395, Pretoria, 0001, South Africa.
2. Caltrans Division of Research and Innovation, Materials and Infrastructure Office, P.O. Box 942873, MS-83 1227 O Street, Sacramento, CA 94273-0001.
3. Pavement Research Center, University of California, Davis; Engineering III, Room 3139, One Shields Ave. Davis, CA 95616:.
4. Pavement Research Center, University of California, Berkeley; 1353 S. 46th St, Bldg. 452, Richmond, CA 94804;.
5. Dynatest Consulting Inc., 165 S. Chestnut St. Ventura, CA 93001:.