1. Professor, Dept. of Civil Engineering, Transportation Engineering Div., Indian Institute of Technology Madras, Chennai-600 036, Tamilnadu, India.
2. Assistant Professor, Civil Engineering Group, Birla Institute of Technology & Science, Pilani–333031, Rajasthan, India; formerly, Ph.D. Scholar, Dept. of Civil Engineering, Transportation Engineering Div., Indian Institute of Technology Madras, Chennai-600 036, Tamilnadu, India (corresponding author).