Design Guidance for Channelized Right-Turn Lanes (2014) / Chapter Skim
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Channelized right-turn lanes with yield control were shown to reduce right-turn delay to vehicles by 25 to 75 percent in comparison to intersection approaches with conventional rightturn lanes. High pedestrian volumes increased right-turn delay by approximately 60 percent on a yield-controlled channelized right-turn lane.
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Raised islands should be considered because they serve as a refuge area so that pedestrians may cross the street in two stages. Raised islands with "cut-through" paths also provide better guidance for pedestrians with vision impairment than painted islands.
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Chapter 1. Introduction This chapter summarizes the background for the research, the research objectives and scope, and the organization of this report.
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• To clearly define the appropriate path for right-turn maneuvers at skewed intersections or at intersections with high right-turn volumes • To improve safety by separating the points at which crossing conflicts and right-turn merge conflicts occur • To permit the use of large curb return radii to accommodate turning vehicles, including large trucks, without unnecessarily increasing the intersection pavement area and the pedestrian crossing distance Many transportation agencies use channelized right-turn lanes to improve operations at intersections, although their impact on safety for motorists, pedestrians, and bicyclists has not been clear. A key concern with channelized right-turn lanes has been the extent of conflicts between vehicles and pedestrians that occur at the point where pedestrians cross the right-turn roadway.
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The primary traffic operational reasons for providing channelized right-turn lanes are to increase vehicular capacity at an intersection and to reduce delay to drivers by allowing them to turn at higher speeds and reduce unnecessary stops. Channelized right-turn lanes appear to provide a net reduction in motor vehicle delay at intersections where they are installed, although no existing data and no established methodology have been available to directly compare the operational performance of urban intersections with and without channelized right-turn lanes.
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survey of highway agency experience. Chapter 3 discusses pedestrian behavior at channelized right-turn lanes based on observational field studies and interviews with orientation and mobility specialists.
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