1. Department of Traffic EngineeringCollege of Transportation and Vehicle EngineeringShandong University of TechnologyZiboShandong255049People's Republic of China
2. Institute of Intelligent Transportation, School of Transportation and LogisticsDalian University of TechnologyDalianLiaoning116024People's Republic of China
3. Institute of Marine Information Science and TechnologyZhejiang UniversityHangzhouZhejiang310058People's Republic of China
4. Department of Civil and Environmental EngineeringUniversity of WashingtonSeattle98105USA