1. Research Assistant, Dept. of Civil Engineering, California State Polytechnic Univ., 3801 West Temple Ave., Pomona, CA 91768.
2. Assistant Professor, Dept. of Civil Engineering, California State Polytechnic Univ., 3801 West Temple Ave., Pomona, CA 91768 (corresponding author).
3. Principal Traffic Engineer, Traffic Management Center, 201 S. Anaheim Blvd., #502, Anaheim, CA 92805.
4. Dept. of Civil Engineering, California State Polytechnic Univ., 3801 West Temple Ave., Pomona, CA 91768.