1. Prof., Dept. of Civ. and Mat. Engrg., Univ. of Illinois at Chicago, 842 West Taylor St., Chicago, IL 60607-7023; formerly, Urban Transp. Ctr., Univ. of Illinois at Chicago, 1033 West Van Buren St., Chicago, IL 60607-2919.
2. Res. Fellow, Ctr. for Transp. Anal., Oak Ridge Nat. Lab., P.O. Box 2008, MS-6206, Oak Ridge, TN 37831-6206; formerly, Urban Transp. Ctr., Univ. of Illinois at Chicago, 1033 West Van Buren St., Chicago, IL.
3. Assoc. Prof., Dept. of Civ. Engrg., Univ. of Colorado at Denver, Denver, CO 80217-3364.
4. Res. Assoc., Dept. of Civ. Engrg., Portland State Univ., P.O. Box 751, Portland, OR 97207; formerly, Urban Transp. Ctr., Univ. of Illinois at Chicago, 1033 West Van Buren St., Chicago, IL.