Setting Speed Limits on Rural Two-Lane Highways by Modeling the Relationship between Expert Judgment and Measurable Roadside Characteristics
Publication: Journal of Transportation Engineering
Volume 137, Issue 3
Abstract
Over recent years it has been assumed that posted speed limits should consider an integrated set of requirements such as the built-in road environment and the presence and characteristics of its users. In the present paper a multinomial logit (MNL) discrete choice model for selecting speed limits is presented as an exploratory method for relating measurable roadside characteristics and speed limits over the full length of rural two-lane highways. The model was developed using as a case study 34 km of rural roads in the region of Coimbra (Portugal). The choice of four traffic safety experts was recorded for each 200 m segment, in both directions, permitting the estimation of the MNL. Only straight and nearly straight roadway segments were considered, and speed limitations resulting from restrictive geometric properties of the segments were disregarded in this study. The explanatory variables were collected to describe the built-up characteristics of the different segments of the road and its surrounding environment. The model adjusted well to the data; and an external data set was shown to be consistent with the expert judgment. Variables that were added to translate lateral roadside constraints were those with a higher significance in explaining the choice of lower limits. Comparing the model with the actual speed limits posted in situ, it was possible to conclude that there is a clear mismatch between these limits and the surrounding environment with a significant tendency for lower posted speed limits compared with the limits at which experts believe that it would be safe to drive.
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Acknowledgments
The writers are grateful to the support of the external faculty experts on road design and safety who participated in the reported experiment.
References
Aarts, L., and Schagen, I. V. (2006). “Driving speed and the risk of road crashes: A review.” Accid. Anal. Prev., 38(2), 215–224.
Agent, K. R., Pigman, J. G., and Weber, J. M. (1998). “Evaluation of speed limits in Kentucky.” Transportation Research Record, 1640, 57–64.
AIPCR/PIARC—World Road Association. (1991). “Through traffic in small towns—Safety and environmental aspects.” Rep. 04.03.B, World Road Association, 〈http://publications.piarc.org/fr/recherche/fiche.htm?publication=213&solo〉.
Autoridade Nacional de Segurança Rodoviária (ANSR). (2009). “Relatório de sinistralidade rodoviária [Report on road accidents].” Autoridade Nacional de Segurança Rodoviária, Lisbon, Portugal, 〈http://www.ansr.pt/LinkClick.aspx?fileticket=Skc1ap20jiA%3d&tabid=273&mid=775&language=pt-PT〉 (in Portuguese).
Ben-Akiva, M. E., and Lerman, S. R. (1985). Discrete choice analysis: Theory and application to travel demand, MIT Press, Cambridge, MA.
Coleman, J. A., and Morford, G. (1998). “Speed management program in FHWA and NHTSA.” ITE J., 68(7).
Department for Transport. (2006). “Setting local speed limits.” DFT—Department for Transport, London.
Domencich, T., and MacFadden, D. (1975). Urban travel demand: A behavioural analysis, Elsevier, New York.
Elvik, R. (2002). “Optimal speed limits, limits of optimality models.” Transportation Research Record, 1818, 32–38.
Eurostat. (2007). People killed in road accidents, Eurostat, Luxembourg.
Farmer, C., Retting, R., and Lund, A. (1999). “Changes in motor vehicle occupant fatalities after repeal of the national maximum speed limit.” Accid. Anal. Prev., 31(5), 537–543.
Fildes, B., Langford, J., Andrea, D., and Scully, J. (2005). “Balance between harm reduction and mobility in setting speed limits: A feasibility study.” Rep. AP-R272/05, Austroads, Sydney, Australia.
Fitzpatrick, K., Carlson, P., Brewer, M., and Wooldridge, M. (2001). “Design factors that affect driver speed on suburban streets.” Transportation Research Record, 1751, 18–25.
Global Road Safety Partnership. (2008). Speed management: A road safety manual for decision-makers and practitioners, Global Road Safety Partnership, Geneva.
Greibe, P., Nilsson, P., and Herrstedt, L. (1999). Speed management in urban areas. A framework for the planning and evaluation process, Ministry of Transport, Copenhagen, Sweden.
Hensher, D. A. (1994). “Stated preference analysis of travel choices: The state of practice.” Transportation, 21(2), 107–133.
Kloeden, C. N., McLean, A., Moore, V. M., and Ponte, G. (1997). “Travelling speed and the risk of crash involvement.” Federal Office of Road Safety, Transport and Communications, Canberra, Australia.
Kockelman, K., and Bottom, J. (2006). “Safety impacts and other implications of raised speed limits on high-speed roads.” Project 17-23, National Cooperative Highway Research Program, Washington, DC.
Lave, C., and Elias, P. (1994). “Did the 65 mph speed limit save lives?” Accid. Anal. Prev., 26(1), 49–62.
Mackey, P. (2004). “Context-sensitive design for rural speed management.” Proc., Congrès Annuel de 2004 de l’Association des Transports du Canada, Quebec.
Malyshkina, N. V., and Mannering, F. (2008). “Effect of increases in speed limits on severities of injuries in accidents.” Transportation Research Record, 2083, 122–127.
McMurtry, T., Saito, M., Riffkin, M., and Heath, S. (2009). “Variable speed limits signs: effects on speed and speed variation in work zones.” Proc., Transportation Research Board 88th Annual Meeting, Washington, DC.
National Cooperative Highway Research Program (NCHRP). (2006) “Project 3-67—Expert system for recommending speed limits in speed zones—Final report.” National Cooperative Highway Research Program, Transportation Research Board, Washington, DC.
Oei, H.-L. (1996). “Automatic speed management in the Netherlands.” Transportation Research Record, 1560, 57–64.
Organisation for Economic Cooperation and Development/European Conference of Ministers of Transport (OECD/ECMT). (2006). “Speed management report.” OECD/ECMT Transport Research Center, Paris.
Raju, S., Souleyrette, R., and Maze, T. (1998). “Impact of 65-mph speed limit on Iowa’s rural interstate highways: Integrated Bayesian forecasting and dynamic modeling approach.” Transportation Research Record, 1640, 47–56.
Rama, P., and Luoma, J. (1997). “Driver acceptance of weather-controlled road signs and displays.” Transportation Research Record, 1573, 72–75.
Rothengatter, J. A. (1991). “Normative behaviour is unattractive if it is abnormal: Relationships between norms, attitudes and traffic law.” Enforcement and rewarding: Strategies and effects, M. J. Koornstra and J. Christensen, eds., Institute for Road Safety Research, Leidschendam, The Netherlands.
Son, H. D., Fontaine, M. D., and Park, B. B. (2009). “Long-term speed compliance and safety impacts of rational speed limits.” J. Transp. Eng., 135(8), 536–544.
Stuster, J., Coffman, Z., and Warren, D. (1998). “Synthesis of safety research related to speed and speed management.” FHWA-RD-98-154, U.S. Dept. of Transportation, Washington, DC.
Transportation Research Board. (1998). “Managing speed—Review of current practice for setting and enforcing speed limits.” Office of Safety and Traffic Operations R&D, Federal Highway Administration, McLean, VA.
Yang, J., and Daniel, J. (2004). “Study of optimal travel speed limits for shared traffic.” New Jersey Institute of Technology, Newark, NJ and Dept. of Transportation–Federal Highway Administration, Washington, DC.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 137 • Issue 3 • March 2011
Pages: 184 - 192
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 19, 2010
Accepted: Jul 23, 2010
Published online: Jul 26, 2010
Published in print: Mar 1, 2011
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