TRB's National Cooperative Highway Research Program (NCHRP) Report 745: Left-Turn Accommodations at Unsignalized Intersections presents guidance for the selection and design of left-turn accommodations at unsignalized intersections. The report includes 11 case studies of typical situations that illustrate the use of the guidance." -- publisher's description.
Reviews the history of the horizontal curve design procedures (rural highways and high-speed urban streets, low-speed urban streets, and curvature of turning roadways and curvature at intersections) through the published policies (1940 to 1990). Presents findings from the literature on key issues, and discusses additional research needs on side friction factors and transition length determination. Bibliography.
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