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Probably the most frequent one is the left-turn channelisation, where an exclusive left-turn lane is provided. Due to that segregated lane, the left-turning vehicles are enabled to quickly clear the intersection approach (Gowri & Sivanandan 2008).
Double Left-turn Lanes. At signalized intersections on multilane conventional highways and on multilane ramp terminals, double left-turn lanes should be considered if the left-turn demand is 300 vehicles per hour or more.
For wide medians, consider the use of offset left-turn lanes at both signalized and unsignalized intersections. Opposing left-turn lanes are offset or shifted as far to the left as practical by reducing the width of separation immediately before the intersection.
Turn lanes at intersections are mainly used to separate turning traffic from through traffic. They also provide safety while reducing delays. Separate left-turn lanes help left-turning vehicles safely decelerate away from the through traffic and eliminate or reduce queues in the through lane.
Auxiliary lanes (left or right-turn lanes) may be used to increase roadway capacity and provide better operational conditions. Channelization may be achieved by increasing corner radii to separate a turning roadway from the normal traveled ways by an island.
8 Μαρ 2016 · Safety advantages of left-turn lanes with raised channelization include: Turning paths are clearly defined within an expansive median opening. Improved visibility for left-turning drivers. Simultaneous opposing left-turn lanes are offset from one another.
2 Ιαν 2008 · Sensitiv-ity analysis was carried out to study the variation of vehicle waiting times. Analysis estimated that vehicle waiting times were reduced if a channelization was provided for a high trafic volume and certain proportions of left turn vehicles in the intersection approach.
