1. Department of Civil Engineering, University of Victoria, Victoria, BC V8W 2Y2, Canada
2. Centre for Environmental Management and Control, University of Nigeria, Enugu Campus, Enugu 410001, Nigeria
3. Mineta Transportation Institute, San Jose State University, San Jose, CA 95192, USA
4. University of Chicago Booth School of Business, Chicago, IL 60637, USA
5. Department of Mechanical and Industrial Engineering Technology, University of Johannesburg, P.O. Box 524, Johannesburg 2006, South Africa