Turn Speeds and Crashes Within Right-turn Lanes

Front Cover
Texas Transportation Institute, Texas A&M University System, 2005 - Roads - 77 pages
Right-turn lanes are used to provide space for the deceleration and storage of turning vehicles and to separate the turning vehicles from the through movement. When larger corner radii are used at the right turn, vehicles can turn at higher speeds (thereby minimizing the speed differential between turning and through vehicles) and can more efficiently merge with the cross-street traffic. A concern with the higher operating speed is the challenge it provides pedestrians attempting to cross the street. Equations are available for predicting speeds on a horizontal curve; however, these equations should not be used for predicting speeds in a right turn. This project analyzed the impact of right-turn lane treatments on vehicle speeds and vehicle safety using nine intersections for the safety study and 18 approaches for the speed study. Each approach for the speed study had an exclusive right-turn lane that was separated from the through lane with either a lane line or with a raised corner island.

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Contents

Review of RightTurn Lane Design
7
Comparison of Portable Speed Measurement Devices in RightTurn Lane
23
FreeFlow Vehicle Speeds in a Right Turn
35

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