1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Washington, Seattle, WA 98195.
2. Researcher, School of Transportation, Southeast Univ., Nanjing 210096, China; Postdoctoral Researcher, Dept. of Civil and Environmental Engineering, Univ. of Washington, Seattle, WA 98195.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, Seattle, WA 98195 (corresponding author).
4. Ph.D. Candidate, Jiangsu Key Laboratory of Urban ITS, Southeast Univ., Nanjing 210096, China.