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Measuring the Performance of the Accident Reductions: Evidence from Izmir City

Authors: Y. Duvarci, S. Mizokami


Traffic enforcement units (the Police) are partly responsible for the severity and frequency of the traffic accidents via the effectiveness of their safety measures. The Police claims that the reductions in accidents and their severities occur largely by their timely interventions at the black spots, through traffic management or temporary changes in the road design (guiding, reducing speeds and eliminating sight obstructions, etc.). Yet, some other external factors than the Police measures may intervene into which such claims require a statistical confirmation. In order to test the net impact of the Police contribution in the reduction of the number of crashes, Chi square test was applied for 25 spots (streets and intersections) and an average evaluation was achieved for general conclusion in the case study of Izmir city. Separately, the net impact of economic crisis in the reduction of crashes is assessed by the trend analysis for the case of the economic crisis with the probable reduction effects on the trip generation or modal choice. Finally, it was proven that the Police measures were effective to some degree as they claimed, though the economic crisis might have only negligible contribution to the reductions in the same period observed.

Keywords: Road Safety, Police, Enforcement units, Chi Squaretest, Economic Impact.

Digital Object Identifier (DOI):

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[1] In-Safety, Newsletter, Issue 2, Nov. 2006. Available: www.insafetyeu. org)
[2] Y. Duvarc─▒, ├û. Selvi, A. K. ├ç─▒nar, "─░zmir-deki Trafik Kazalar─▒n─▒n Kentsel ve Mekansal Analizlerinin CBS ile Yorumlanmas─▒ Konusunda Bir Yöntem Denemesi" (A GIS Method for Evaluating the Urban Spatial Patterns of the Traffic Accidents in ─░zmir). Trafik ve Yol G├╝venli─ƒi Kongresi (TRODSA), 4-6 May─▒s 2005, Ankara.
[3] Round Table, Economic Evaluation of Road Traffic Safety Measures, Conclusions of Round Table 117, ECMT, 26-27 October, Paris. 2000
[4] G. Yannis, E. Papadimitriou, C. Antoniou, "Multilevel modelling for the regional effect of enforcement on road accidents," Accident Analysis and Prevention, Vol. 39, pp.818-825, 2007.
[5] C. Nicolle and B. Peters, "Elderly and Disabled Travellers: Intelligent Transportation Systems Designed for the Third Millenium", Transportation Human Factors, Vol. 1, N.2, pp.121-134, 1999.
[6] A. M. Welki and T. J. Zlatoper, "The impact of highway safety regulation enforcement activities on motor vehicle fatalities," Transportation Research Part E, Vol. 43, pp. 208-217. 2005.
[7] S. Erdogan, I. Yilmaz, T. Baybura, M. Gullu, "Geographical information systems aided traffic accident analysis system case study: city of Afyonkarahisar," Accident Analysis and Prevention, Vol. 40, pp.174- 181, 2008.
[8] U. Persson, A. Norinder, K. Hjalte, K. Gralen, "The Value of a Statistical Life in Transport: Findings from a New Contingent Valuation Study in Sweden," The Journal of Risk and Uncertainty, Vol. 23, N. 2, pp. 121-134, 2001.
[9] M. Lu, "Modelling the effects of road traffic safety measures," Accident Analysis & Prevention, Vol. 38. N. 3, pp.507-517, 2006.
[10] T. Bliss, Implementing the Recommendations of The World Report on Road Traffic Injury Prevention (Report). Road safety Taskforce Operational Guide for World Bank Staff, The World Bank, Transport Note. No.TN-1 April 2004, Washington D.C.
[11] W. M. Hearst, L. J. Mountain, M. J. Maher, "Are speed enforcement cameras more effective than other speed management measures? An evaluation of the relationship between speed and accident reductions," Accident Analysis & Prevention, Vol. 37, N. 4, pp.731-41, 2005.
[12] R. Vivian and R. Veeraragavan, "Evaluation of Traffic Management Measures in Accident Reduction Under Mixed Traffic". Proc. 16th ICTCT Workshop, Soesterberg, pp. 1-10, 2003.
[13] L. A. Foldvary and J. C. Lane, "The effectiveness of compulsory wearing of seat-belts in casualty reduction (with an appendix on chisquare (partitioning-tests of complex contingency tables)," Accident Analysis & Prevention, Vol 6, N. 1, Sept., pp.59-81, 1974.
[14] Y. Khang, J. W. Lynch, G. A. Kaplan, "Impact of economic crisis on cause-specific mortality in South Korea," International Journal of Epidemiology, Vol. 34, N. 6, pp.1291-1301, 2004.
[15] TUIK, Turkish Statistical Institute of State, Ankara, 2005. Available:
[16] Belgenet. Available:, updated 2005.
[17] KGM (Highways General Directorate), Trafik G├╝venli─ƒi Projesi (Traffic Safety project), SWEROAD, Nisan 2001.