1. Jiangsu Key Laboratory of Urban ITS, Jiangsu Collaborative Innovation Center of Modern Urban Traffic Technologies, School of Transportation, Southeast University, Nanjing, Jiangsu, P. R. China
2. School of Modern Posts, Nanjing University of Posts and Telecommunications, Nanjing, China
3. College of Transportation Engineering, Chang’an University, Xi’an, Shaanxi, P. R. China