1. Prin. Traffic Engr., Midwest Res. Inst., 425 Volker Blvd., Kansas City, MO 64110
2. Sr. Res. Engr., Traffic Safety Res. Div. (HSR‐30), Turner‐Fairbanks Hwy. Res. Ctr., 6300 Georgetown Pike, McLean, VA 22101
3. Kansas State Univ., Civ. Engrg. Dept., Manhattan, KS 66506