This study was partially supported financially from Mitsui Sumitomo Insurance Welfare Foundation Research Grant (FY2013) and Special Task Force for Activating Research (STAR), Ratchadaphiseksomphot Endowment Fund, Chulalongkorn University. Furthermore, the tested vehicle was supported by Smart Mobility Research Center, Chulalongkorn Universiy through a research grant by Tri-Petch Isuzu Sale Co., Ltd.