1. Precision Systems, Inc, Washington, DC, USA
2. CARRS-Q, Queensland University of Technology, Kelvin Grove, QLD, Australia
3. Charles E. Via, Jr. Department of Civil and Environmental Engineering, Virginia Tech Transportation Institute, Blacksburg, VA, USA
4. Civil Engineering Department, King Saud University, Riyadh, Saudi Arabia
5. Department of Statistics, Virginia Tech, Blacksburg, VA, USA