Pedestrian Safety versus Traffic Flow: Finding the Balance
Pedestrian Safety versus Traffic Flow: Finding the Balance
Seventh Annual TRIPP Lecture, 16 March 2015 by Robert B Noland
About the author:
Robert B. Noland is a Professor at the Edward J. Bloustein School of Planning and Public Policy and serves as the Director of the Alan M. Voorhees Transportation Center. He received his PhD at the University of Pennsylvania in Energy Management and Environmental Policy. Prior to joining Rutgers University he was Reader in Transport and Environmental Policy at Imperial College London, a Policy Analyst at the US Environmental Protection Agency and also conducted post-doctoral research in the Economics Department at the University of California at Irvine. The focus of Dr. Noland's research is the impacts of transport planning and policy on both economic and environmental outcomes. Work on economic effects has included examining behavioral reactions to changes in reliability, associations with the built environment, and trip' chaining behavior. Environmental work includes impacts on safety, climate, health, and other factors associated with overall quality of life. Dr. Noland's research has been cited throughout the world in debates over transport infrastructure planning and environmental assessment of new infrastructure. Dr. Noland is currently the Associate Editor of Transportation Research-D (Transport and Environment) and the International Journal of Sustainable Transportation and is Chair of the Transportation Research Board Special Task Force on Climate Change and Energy.
Abstract
Pedestrian safety is an issue in many urbanized areas throughout the world. While this is recognized by policy makers many tend to focus more on traffic congestion and finding solutions to improve traffic flow. These two objectives are often in conflict in urban areas. This paper outlines the early history of this conflict in Great Britain and the United States leading up to the development of engineering guidelines focused on improving traffic flow and the level of service in cities; guidelines that are replicated in many developing countries. New safety manuals are being developed and some of the flaws with these are also highlighted, primarily that they tend to ignore behavioral adaptation that can occur in response to safety policies. This is followed by a review of research examining safety trends and policies that have successfully reduced fatalities. This research also suggests that the construction of large arterial and collector roads is counterproductive, despite the recommendations in engineering guidance. Pedestrian casualties and their severity are then discussed, with findings that show that larger, high-speed roads tend to result in more severe injuries and that various features of urban environments are beneficial for pedestrian safety. Various problems with the data available for conducting this type of analysis, especially pedestrian fatality data made the rigorous tracking of such information problematic. Solutions to improving traffic and pedestrian safety are then highlighted, including shared space concepts, complete streets, and road diets that reduce the flow of traffic. A cost/benefit analysis of a road diet is evaluated showing that for the case studied, the safety benefits are overwhelmingly positive, with only minor costs associated with extra traffic delay. In closing, the implications for rapidly developing countries are briefly discussed with a warning not to follow the path of some western countries.