1. Dept. of Traffic Engineering and Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji Univ., Shanghai 201804, PR China.
2. Lianyungang Jari Electronics Co., Ltd., Lianyungang, Jiangsu 222061, PR China.
3. Dept. of Comprehensive Traffic Information and Key Laboratory of Road and Traffic Engineering, Ministry of Education, Tongji Univ., Shanghai 201804, PR China.