This book comprises the proceedings of the Sixth International Conference of Transportation Research Group of India (CTRG2021) focusing on emerging opportunities and challenges in the field of transportation of people and freight. The contents of the volume include characterization of conventional and innovative pavement materials, operational effects of road geometry, user impact of multimodal transport projects, spatial analysis of travel patterns, socio-economic impacts of transport projects, analysis of transportation policy and planning for safety and security, technology enabled models of mobility services, etc. This book will be beneficial to researchers, educators, practitioners and policy makers alike.

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Dr. Lelitha Devi is a Professor in the Transportation Division of the Department of Civil Engineering at IIT Madras and holds a Ph.D. from Texas A&M University, USA. Her teaching and research interests are in the general area of transportation systems with emphasis on traffic flow modelling, traffic operations, and Intelligent Transportation systems. She has published around 90 referred journal papers and more than 100 conference papers. She serves in various editorial boards and is a member of various national and international societies. She has been involved in 15 research projects and has graduated more than 10 MS/Ph.D. scholars.

Dr. Madhu Errampalli is a Senior Principal Scientist in Transportation Planning and Environment Division at CSIR-Central Road Research Institute (C.R.R.I.), New Delhi, India. He has more than 22 years of experience of R&D and Consultancy works in the areas of Transportation Planning, Traffic Engineering and Road Safety. His main research interests are microscopic traffic simulation and fuzzy logic. He did PhD in Transportation Engineering from Gifu University, Gifu, Japan. He completed about 38 R&D and Consultancy Projects and published a total of 132 Research Publications. He also guided 24 M.Tech/ ME students and 1 PhD Student. He has received number of recognitions and awards namely Pt. Jawaharlal Nehru Birth Centenary Award 2017 from IRC, Vishwakarma Award 2016 of CIDC for the category of Scientist, SKOCH Order of Merit Award 2015 for SUSTRANS Project on being a Champion of the Project, Young Scientist Award 2011-12 from CSIR-CRRI, Two times Bronze Medal Award from IRC in 2005 and 2011, Best Article Award in Indian Journal of Traffic Management by ASRTU in 2009, Session Best Presentation Award in SCIS & ISIS 2006, Tokyo, Japan, Japanese Government Scholarship (Monbugakusho) for 2004 - 2008, etc. He served as Member Secretary, IRC H-1 Committee on Transport Planning & Traffic Engineering, 2018-2021.

Dr. Avijit Maji is a Professor in the Department of Civil Engineering, IIT Bombay, India. He received Doctor of Engineering from Morgan State University, USA in 2008; M.Tech. from IIT Kanpur in 2004; and B.E. from Bengal Engineering College (now known as Indian Institute of Engineering Science and Technology) in 2000. He has more than eighteen years of academia and industry experience working for organizations in India and USA. At present, he is a member of Transportation Research Board's Standing Committee on Performance Effects of Geometric Design (AKD 10), Co-Chair of Performance-Based Approaches and Applications Subcommittee and Chair of Technical Committee of the Transportation Research Group of India on Transportation Safety and Security. His area of expertise includes design, operations,and safety of transportation infrastructure. He has published more than eighty technical research papers in journals, edited books, and conferences. For his contribution, Maryland Society of Professional Engineers conferred him with the "Young Engineer of the Year Award" in 2011. He is a licensed Professional Engineer (PE) in Maryland, USA and Transportation Professional Certification Board's certified Professional Traffic Operations Engineer (PTOE). Dr. Gitakrishnan Ramadurai is an Associate Professor in the Transportation Engineering Division, Department of Civil Engineering, IIT Madras, and a core faculty member in the Robert Bosch Center for Data Science and AI at IIT Madras. He received his Ph.D. in Transportation Engineering from Rensselaer Polytechnic Institute, Troy, NY, in June 2009, M.S. in Civil Engineering from the University of Texas at Austin in December 2003, and B.Tech. with honors in Civil Engineering from Indian Institute of Technology, Roorkee in May2002. His overarching goal is to develop technological and management solutions for a safe and sustainable transportation system. His primary research interests are in network modeling, dynamic traffic simulation and assignment, Intelligent Transport Systems (ITS), vehicular emissions, urban freight, public transit systems, and road safety. He was awarded First Place in the 2009 Dissertation Prize by Transportation Science and Logistics Society, Institute for Operations Research and Management Science (INFORMS) in San Diego, USA. He is a recipient of New York Metropolitan Transportation Commission's September 11 Memorial Program Fellowship in 2007-08. He has co-authored over 65 conference and journal papers. He has served as a principal / co-investigator in Government of India funded projects on ITS and urban transportation. He has advised Chennai Port Trust, JNPT, Kolkata Port Trust and CIDCO, Navi Mumbai on improving congestion of trucks destined to ports, and various government organizations including Chennai Corporation, Tamil Nadu Police, TNHSP / EMS on ITS technology implementation, transportation planning, and management, and road safety. He was a corresponding member of the IRC H-8 committee on urban roads from 2015-17.