1. Department of Transportation, Logistics, and Finance, Upper Great Plains Transportation Institute, North Dakota State University (NDSU), Fargo, ND, USA
2. Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, MA, USA
3. Department of Physics, University of Houston, Houston, TX, USA
4. Department of Civil and Environmental Engineerin, Rutgers, The State University of New Jersey, Piscataway, NJ, USA