An Analysis of Traffic Signal Safety Improvements

by Robert E. Craven, Illinois DOT, Springfield, IL, USA,

Document Type: Proceeding Paper

Part of: Effectiveness of Highway Safety Improvements


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 analysis | Traffic safety | Traffic signals | Accidents | Traffic accidents | Federal government | Traffic signs | Intersections | Illinois | United States

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