1. Assistant Professor, Dept. of Civil Engineering, IIT Guwahati, North Guwahati, Guwahati-39, Assam, India; formerly, Transportation Planner, Mumbai Metropolitan Region Development Authority, Bandra (E), Mumbai-51, India; formerly, Research Scholar, Dept. of Civil Engineering, IIT Bombay, Mumbai-76, India (corresponding author). E-mail: rsashu@yahoo.com
2. Professor-Emeritus, Dept. of Civil Engineering, Transportation Systems Engineering, IIT Bombay, Mumbai-76, India. E-mail: dhingra@civil.iitb.ac.in