1. Asst. Res. Engr., Inst. of Transp. Studies—PATH, Univ. of California, Berkeley, 1301 S. 46th St., Bldg. 452, Richmond, CA 94804
2. Prof., Dept. of Civ. Engrg., Univ. of Tennessee, Perkins Hall, Knoxville, TN 37996
3. Dir., Transp. Ctr., Univ. of Tennessee, South Stadium Hall, Knoxville, TN 37996
4. Group Leader, Oak Ridge Nat. Lab., P.O. Box 2008, MS 6366, Oak Ridge, TN 37831