AUTHOR=Kaewunruen Sakdirat , Sussman Joseph M. , Matsumoto Akira TITLE=Grand Challenges in Transportation and Transit Systems JOURNAL=Frontiers in Built Environment VOLUME=Volume 2 - 2016 YEAR=2016 URL=https://www.frontiersin.org/journals/built-environment/articles/10.3389/fbuil.2016.00004 DOI=10.3389/fbuil.2016.00004 ISSN=2297-3362