United States Department of Transportation
i
Use of Roundabouts and Innovative Intersection Designs at High-Speed Intersections in Texas [Project Summary]
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2022-07-31
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[PDF-276.80 KB]
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Edition:Project Summary Report
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Abstract:Innovative intersection designs (e.g., diverging diamond interchanges [DDIs], displaced left turns [DLTs], median U-turns [MUTs], and restricted crossing U-turns [RCUTs]) and modern roundabouts have been used successfully to remove conflict points and redistribute turning traffic from traditional intersections. However, minimal guidance exists on using these 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. Researchers compiled proven results from these designs in other states and collected and analyzed operational and safety data from intersections within and outside Texas to develop updated design guidance, which can be used to implement roundabout designs that accommodate oversize/overweight (OSOW) vehicles and innovative intersections that provide appropriate access in rural areas.
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