Title: Clearance Intervals - ITE Guidelines Prove To Be Effective
Abstract: This paper describes how there has always been a debate on whether the Institute of Transportation Engineers (ITE) recommended guidelines for clearance intervals or change intervals should be used to time traffic signals. For many years in Michigan this has been a topic of discussion and debate between road agencies while red light violation and related traffic crashes continues to be a concern, and this is because a good portion of crashes that occur at urban signalized intersections involve the running of red lights and often result in severe injuries. In late 2002 and 2003 the City of Troy engineers calculated clearance/change intervals (yellow + all-red) for all signalized intersections using the ITE guidelines. The Road Commission for Oakland County (RCOC) maintains all traffic signals within the City, and as partners in this effort, implemented in 2003 and early 2004. The revised clearance intervals were based on ITE guidelines that now included the recommended yellow and all-red times. A study was performed to analyze before and after traffic crash experience. The study included the top 20 high-crash locations in the City. One year’s worth of “before” data and one year worth of “after” data on traffic crashes were compared. A review of the comparison reveals that at a majority of intersections there have been reductions in traffic crashes. This paper discusses the findings of this evaluation of clearance intervals.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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