An Analysis of Traffic Signal Safety Improvementsby Robert E. Craven, Illinois DOT, Springfield, IL, USA,
Abstract: Identifying high accident rate locations and determining that they have an overrepresented type or pattern of accidents is an important first step in the safety improvement process. However, selecting the proper countermeasure (or determining if, in fact, there is an appropriate one) is even more critical. A case in point is a group of intersections in Illinois that were improved under the Federal Hazard Elimination (HES) safety program. Various types of signalization improvements were made at the locations studied. They can be generally categorized as: (1) signal installation, (2) signal upgrading only, and (3) signal upgrading with intersection improvements. This paper discusses the relative effectiveness of these three types of improvements in terms of before and after accident experience (two years of before and two years of after data).
Subject Headings: Traffic signals | Traffic safety | Traffic analysis | Traffic accidents | Intersections | North America | Illinois | United States
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