Simulator Assessment of Alternative Lane Grouping At Signalized Intersections [techbrief]
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Simulator Assessment of Alternative Lane Grouping At Signalized Intersections [techbrief]

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      This document is a technical summary of the Federal Highway Administration report, Simulator Assessment of Alternative Lane Grouping at Signalized Intersections (FHWA-HRT-19-025). Throughput at signalized intersections with high left-turn demand is a common cause of bottleneck for traffic flow. Dynamic lane-grouping strategies offer cost-effective methods for increasing operational efficiency within existing rights of way. Previous traffic simulations suggest that reversible left turn lanes can significantly increase throughput at intersections where left-turn demand is high. However, the operational benefits offered by reversible-turn-lane designs depend on safe and proper use by drivers. Because reversible lanes make use of existing infrastructure and are time-of-day dependent, they require clear and adaptive signs and signals to indicate the active or closed status of a reversible lane and control alternative lane assignment during active periods. Reversible-lane designs may also expose drivers to novel or unfamiliar situations, such as sharing a lane with opposing traffic waiting at the far side of the intersection. In these cases, appropriate signs can mitigate unsafe driving behaviors and driver discomfort or confusion. In addition, improved signs and markings may aid in minimizing issues observed at existing reversible-lane interchanges, such as incorrect or missed turns and lane changes within the intersection.
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