[Li, Oujing; Li, Ping] Changsha Univ Sci & Technol, Sch Traff & Transportat Engn, 960,2nd Sect,Wanjiali Rd S, Changsha 410004, Hunan, Peoples R China.
[Zhai, Long] Guizhou Transportat Planning Survey & Design Acad, 100 Yangguan Ave, Guiyang 550000, Guizhou, Peoples R China.
[Yan, Qiang; Fu, Qin] Guangxi Commun Investment Technol Co Ltd, 71 Anji Ave, Nanning 530001, Guangxi, Peoples R China.
[Yu, Zhengrong] Hunan Commun Res Inst Co Ltd, 472,Three Sect Furong Middle Rd, Changsha 410004, Hunan, Peoples R China.