1. Assoc. Prof., Dept. of Civ. Engrg., Rensselaer Polytechnic Inst., Troy, NY 12180
2. Traffic Engr., City of Albany, Div. of Traffic Safety, 526 Central Ave., Albany, NY 12206
3. Research Asst., Dept. of Civ. Engrg., Rensselaer Polytechnic Inst., Troy, NY 12180