Turn Speeds and Crashes Within Right-turn Lanes
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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Review of RightTurn Lane Design
Comparison of Portable Speed Measurement Devices in RightTurn Lane
FreeFlow Vehicle Speeds in a Right Turn
0.000l Right-Turn Lane angle Beginning of Right Chan classiﬁer College Station corner islands corner radius corner radius ft crash rates Crash Type Crosswalk curb ramps design vehicle driver equations developed Figure ﬁndings Fit for Speed free-ﬂow speed horizontal curves IIIIIIIIIII included inﬂuence Irving lane line lane with island laser gun Least Squares Fit Line Island Measured Speed Values Middle of Right midpoint n lane N/A N/A pedestrian crossing percent Percentile Data percentile speed pneumatic tubes point of curvature prediction equations radii raised island Regression Equations Right Turn Based Right-Turn Crashes RIGHT-TURN LANE DESIGN Right-Turn Lane Length Right-Turn Lane Width Right-Turn Treatment right-turning vehicle shared lane Sideswipe Speed at Beginning speed measurement devices speed zone speeds of vehicles Table Texas Transportation Institute trafﬁc Turning Roadway Width turning speeds turning vehicles TxDOT Type of Right-Turn Vehicle stopped video camera WB-50 Truck