1. Research Scholar, Dept. of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
2. Associate Professor, Dept. of Civil Engineering, Univ. of Iowa, Iowa City, IA 52242.
3. Associate Professor, Dept. of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India (corresponding author).
4. Associate Professor, Dept. of Engineering Design, Indian Institute of Technology Madras, Chennai 600036, India.
5. Professor and Director, Mid-America Transportation Center, Univ. of Nebraska—Lincoln, Lincoln, NE 68583-0851.