Title: DO 12 INCH SIGNAL LENSES REDUCE ANGLE CRASHES
Abstract: In 1986, the City of Winston-Salem started a formal Safety Improvement Program. It identifies crash locations, uses traffic engineering tools and techniques to treat problems, evaluates each treatment and records the results in a library of completed case studies. The program differs from traditional traffic engineering based safety improvement programs in that it does not rely on a priority listing of crash locations. Instead, the program simple requires that a location display a pattern of crashes that could be remedied through the application of traffic engineering tools or techniques. Each location is evaluated using a before and after paradigm. Results are tested statistically using the Poisson Distribution Test described by Lunenfeld. In the program's 11 year history, a library of 186 completed before and after studies have been compiled. Thirty-eight of these studies describe attempts to reduce right angle crashes, on one or more approaches to signalized intersections, by replacing signal heads that have 8 inch signal lenses with larger traffic signal heads that have 12 inch signal lenses. This paper discusses the results of these studies.
Publication Year: 1998
Publication Date: 1998-01-01
Language: en
Type: article
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