Comparing Safety Performance Measures Obtained from Video Capture Data
Publication: Journal of Transportation Engineering
Volume 137, Issue 7
Abstract
Safety performance is evaluated by using measures obtained experimentally from a videotaping of traffic operations at an urban roundabout situated in Cosenza, Italy. Five different expressions of safety performance from the perspective of “rear-end” vehicle interactions include maximum deceleration rate to avoid a crash (DRAC), time-to-collision (TTC), proportion of stopping distance (PSD), time integrated time-to-collision (TIT), and crash potential index (CPI). Differences in safety performance are discussed with respect to the type of measure, traffic conditions, and variations in roundabout geometry. The results of this analysis suggest that safety performance is highly sensitive to the way it is measured; different measures can highlight different locations or geometric features of the roundabout as posing potential safety problems. This study underscores the usefulness of safety performance measures for providing meaningful experimental indicators of potential safety problems at roundabouts and how these problems can be affected by changing traffic conditions.
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References
Allen, B. L., Shin, B. T., and Cooper, D. J. (1978). “Analysis of traffic conflicts and collision.” Transportation Research Record 667, Transportation Research Board, Washington, DC, 67–74.
Almquist, S., Hyden, C., and Risser, R. (1991). “Use of speed limiters in cars for increased safety and a better environment.” Transportation Research Record 1318, Transportation Research Board, Washington, DC, 34–39.
American Association of State Highway and Transportation Officials. (2004). A policy on geometric design of highways and streets, Washington, DC.
Archer, J. (2005). “Methods for the assessment and prediction of traffic safety at urban intersection and their application in micro-simulation modelling.” Ph.D. thesis, Dept. of Infrastructure, Royal Institute of Technology, Stockholm, Sweden.
Coifman, B., Beymerb, D., McLauchlanb, P., and Malik, J. (1998). “A real-time computer vision system for vehicle tracking and traffic surveillance.” Transp. Res. Part C, 6(4), 271–288.
Cunto, F., and Saccomanno, F. F. (2007). “Microlevel traffic simulation method for assessing crash potential at intersections.” Proc., 86th Annual Meeting, Transportation Research Board, Washington, DC.
Cunto, F., Saccomanno, F. F., and Duong, D. (2009). “Comparison of simulated safety performance to observed crash occurrence.” Transportation Research Record 2103, Transportation Research Board, Washington, DC, 88–97.
Elvik, R., and Vaa, T. (2004). The handbook of road safety measures, Elsevier, Oxford, UK.
Evans, L. (1991). Traffic safety and the driver, Van Nostrand Reinhold, New York.
Federal Highway Administration (FHWA). (2003). “Surrogate safety measure from traffic simulation models.” Rep. FHWA-RD-03-050, McLean, VA.
Fisk, C. S. (1991). “Traffic performance analysis at roundabouts.” Transp. Res. Part B, 25(2–3), 89–102.
Hayward, J. (1971). “Near misses as a measure of safety at urban intersections.” Ph.D. thesis, Dept. of Civil Engineering, The Pennsylvania State Univ., University Park, PA.
Heimes, F., and Nagel, H. H. (1998). “Real-time tracking of intersections in image sequences of a moving camera.” Eng. Appl. Artif. Intell., 11(2), 215–227.
Hsieh, J. W., Yu, S. H., Chen, Y. S., and Hu, W. F. (2006). “Automatic traffic surveillance system for vehicle tracking and classification.” IEEE Trans. Intell. Ttransp. Syst., 7(2), 175–187.
Huguenin, F., Torday, A., and Dumont, A. (2005). “Evaluation of traffic safety using microsimulation.” Proc., 5th Swiss Transport Research Conf. (STRC), Monte Verità, Ascona, Switzerland.
Hydén, C. (1987). The development of a method for traffic safety evaluation: The Swedish traffic conflicts technique, Lund Institute of Technology, Lund, Sweden.
Hydén, C., and Várhelyi, A. (2000). “The effects on safety, time consumption and environment of large scale use of roundabouts in an urban area: A case study.” Accid. Anal. Prev., 32(1), 11–23.
Lin, C. P., Tai, J. C., and Song, K. T. (2003). “Traffic monitoring based on realtime image tracking.” Proc., Int. Conf. on Robotics and Automation, Vol. 2, IEEE, New York, 2091–2096.
Lord, D., van Schalkwyk, I., Chrysler, S., and Staplin, L. (2007). “A strategy to reduce older driver injuries at intersections using more accommodating roundabout design practices.” Accid. Anal. Prev., 39(3), 427–432.
Minderhoud, M., and Bovy, P. (2001). “Extended time to collision measures for road traffic safety assessment.” Accid. Anal. Prev., 33(1), 89–97.
Ministero delle Infrastrutture e dei Trasporti. (2001). “Norme funzionali e geometriche per la progettazione delle strade.” Decreto Ministeriale, Rome (in Italian).
Ogden, K. W. (1996). Safer roads. A guide to road safety engineering, Avebury Technical, Aldershot, UK.
Van der Horst, A. R. A. (1991). “Time-to-collision as a cue for decision-making in braking.” Vision in vehicles, Vol. 3, I. D. Brown, C. M. Haselgrave, I. Moorhead, and S. Taylor, eds., 19–26.
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© 2011 American Society of Civil Engineers.
History
Received: Dec 4, 2009
Accepted: Sep 21, 2010
Published online: Oct 9, 2010
Published in print: Jul 1, 2011
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