1. Nanjing Institute of City and Transport Planning, 63-1 Zhujiang Rd., Naning, China 210008.
2. Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37923-2010; and School of Traffic and Transportation Engineering, Changsha Univ. of Science and Technology, Changsha, China (corresponding author).
3. Kittelson and Associates, Inc., 4332 Teravista Club Dr., Unit 75, Round Rock, TX 78665.