An investigation of traffic crash migration at urban intersections.

Author(s)
Datta, T. Schattler, S. Jahan, I. & Datta, S.
Year
Abstract

Safety professionals are often concerned about the installation of safety measures at selected high crash locations due to the potential for the past crash experiences of the improved locations moving to other untreated locations within the same area. It is postulated that increases in the traffic crash experience at untreated locations would occur after improvements were made at only selected treated locations in an area that experiences significant crash reductions. Past research indicates that this `migration' phenomenon is possible under certain conditions. A public-private partnership project in the City of Detroit, Michigan was initiated in 1996 to alleviate traffic crash and severity problems at select high crash locations. AAA Michigan, one of the largest insurance companies in Michigan, partnered with the City of Detroit, Wayne County, the Michigan Department of Transportation (MDOT), the Office of Highway Safety Planning (OHSP) and Wayne State University, to identify high crash locations and implement low cost countermeasures, in order to reduce crashes and injuries. Low cost safety treatments were installed at several intersections in the northeast part of the City of Detroit. A "before and after" safety evaluation study revealed that total crashes and injury crashes were reduced by close to 50 percent at the locations where safety improvements were made in 1997. The reduction of right angle crashes, left-turn head-on and injury crashes were statistically significant. The purpose of this study was to determine if the intersection locations in the vicinity of the treated sites were experiencing increased traffic crashes and injuries due to traffic crash migration effect. The results of the statistical analyses for intersections without implemented countermeasures indicated the differences in targeted crash types during the same time period were not significant. Therefore, no migration effects were identified in this study. The results of the statistical analyses performed for grouped intersections with implemented countermeasures indicated significant reductions in traffic crashes for total, injury, right angle and left-turn head-on crashes. (Author/publisher).

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Publication

Library number
C 21136 (In: C 21105 CD-ROM) /82 / ITRD E205739
Source

In: Proceedings of the Conference Road Safety on Three Continents in Pretoria, South Africa, 20-22 September 2000, VTI Konferens 15A, p. 363-375, 5 ref.

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