Left-Turn Accommodations at Unsignalized Intersections (2013) / Chapter Skim
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1 Left-Turn Accommodations at Unsignalized Intersections NCHRP Project 3-91, "Left-Turn Accommodations at Unsignalized Intersections," had two primary research goals: • Develop an objective and clear process for the selection of left-turn accommodations at unsignalized intersections and • Provide guidance on the design of these accommodations. The second of those goals led to the decision to create this design guide to facilitate the distribution of findings from that project and to assist practitioners in their efforts when installing, or deciding when to install, left-turn lanes at unsignalized intersections.
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2typically lower than those described in various states' manuals and other guidance documents, with installations warranted for as few as five left-turning vehicles in the peak hour, depending on the opposing through volume. These warrants are based on a benefit-cost analysis conducted in NCHRP Project 3-91.
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