1. Graduate Institute of Logistics Management, National Dong Hwa University, 1 Section 2, Da Hsueh Road, Shou-Feng, Hualien 974, Taiwan.
2. Graduate Institute of Traffic and Transportation, National Chiao Tung University, 4 F, No. 18, Line 16, Section 1, Bao'an Street, Shulin District, New Taipei City 23841, Taiwan.
3. Department of Civil and Environmental Engineering, A. James Clark School of Engineering, University of Maryland, College Park, MD 20742.