1. School of Intelligent Systems Engineering, Sun Yat-sen University, Shenzhen, Guangdong, People's Republic of China
2. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, People's Republic of China
3. School of traffic and transportation, Beijing Jiaotong University, Beijing, People's Republic of China
4. Department of traffic planning, Nanchang urban planning and design institute, Nanchang, People's Republic of China