United States Department of Transportation
i
Research and Findings on Roundabouts and Innovative Intersections for High-Speed and Rural Locations
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2023-10-01
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[PDF-7.87 MB]
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Edition:August 2019-May 2022
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Abstract:Texas has thousands of centerline-miles of high-speed roadways where access might traditionally have been restricted, but there are an increasing number of high-speed roadways that have at-grade intersections and driveways. Innovative intersection designs (e.g., j-turns, median U-turns) and modern roundabouts have been used to remove conflict points and redistribute turning traffic from traditional intersections, and their success has been documented at locations across the country. However, minimal guidance exists on using those intersection types at rural and high-speed locations, particularly to serve high volumes of heavy vehicles. This project investigated the operational and safety benefits of modern roundabouts and selected innovative intersection designs for high-speed locations, as well as best practices for designing these intersections. The research team compiled proven results from these designs in other states and collected and analyzed operational and safety data from within and outside of Texas to develop updated design guidance, which can be used to implement roundabout designs that accommodate oversize/overweight vehicles and innovative intersections that provide appropriate access in rural areas.
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