1. Asst. Prof., The Univ. of Texas at San Antonio, Div. of Engrg., 6900 N. Loop 1604 W., San Antonio, TX 78249-0665. E-mail: helwany@ voyager1.utsa.edu
2. Res. Asst., The Univ. of Texas at San Antonio, Div. of Engrg., 6900 N. Loop 1604 W., San Antonio, TX.
3. Engrg. Asst., Texas Dept. of Transp., Design Div., 125 E. 11th St., Austin, TX 78701. E-mail: jleidy@mailgw.dot.state.tx.us