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- W2151486976 abstract "Design exceptions are used in roadway projects that require design elements that vary from typical designs. There have been concerns raised regarding the safety implications of the use of lower than typical design values. This study summarized past design exceptions in Kentucky to document their frequency and reason for their use and evaluate possible safety consequences from these exceptions. A site visit was made to a large number of the locations where the project was built with the requested design exception, and available crash data were obtained at these locations. There was an average of 39 design exceptions per year for the 1993 to 1998 period. The majority of the projects involved a bridge replacement with the next most frequent being roadway widening reconstruction projects and construction of turning lanes. The most common design exception was for a design speed lower than the posted speed limit followed by a reduction in sight distance, curve radius, or shoulder width. The crash analysis showed that, with a very few exceptions, use of the design exception process did not have any negative effects on highway safety. The analysis showed that the design exception projects resulted in an improvement over the prior condition although some aspect of the design may not be typical." @default.
- W2151486976 created "2016-06-24" @default.
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- W2151486976 date "2005-01-01" @default.
- W2151486976 modified "2023-09-27" @default.
- W2151486976 title "DESIGN EXCEPTIONS AND SAFETY" @default.
- W2151486976 hasPublicationYear "2005" @default.
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