About WCTTE2019 2019 2nd World Congress of Traffic and Transportation Engineering (WCTTE2019) (http://www.wctte.org/2019/en/home) is a platform for academic communications between specialists and scholars in the fields related to traffic and transportation engineering. WCTTE2019 will be held in Hangzhou, China during Dec. 16-18, 2019. Hangzhou is the capital of Zhejiang Province and one of the seven ancient capitals of China. Publication 2019 2nd World Congress of Traffic and Transportation Engineering (WCTTE2019) accepts original and unpublished papers. Both Full paper and Abstract are welcomed. Full papers accepted by the conference will be published online in the following journals of Science Publishing Group (http://www.sciencepublishinggroup.com). The journals have been indexed and abstracted by WorldCat, CrossRef, Electronic Journals Library, CNKI, Zeitschriftendatenbank, EZB, ResearchBib, Polish Scholarly Bibliography, Wissenschaftszentrum Berlin, etc. International Journal of Transportation Engineering and Technology (IJTET) http://www.sciencepublishinggroup.com/j/ijtet ISSN Print: 2575-1743 ISSN Online: 2575-1751 American Journal of Mechanical and Industrial Engineering (AJMIE) http://www.sciencepublishinggroup.com/j/ajmie ISSN Print: 2575-6079 ISSN Online: 2575-6060 Science Discovery (SD) http://www.sciencepublishinggroup.com/j/sd ISSN Print: 2331-0642 ISSN Online: 2331-0650