1. Asst. Prof., Transp. and Infrastructure Sys., School of Civ. and Envir. Engrg., Georgia Inst. of Technol., Atlanta, GA 30332; Georgia Transp. Inst., Georgia Inst. of Technol., Atlanta, GA.
2. Dir., Urban Transp. Ctr., MC 357, Univ. of Illinois at Chicago, 412 S. Peoria St., Ste. 340, Chicago, IL 60607.