The installation of traffic lights turn left hander to area set the matters needing attention

Left the car when crossing ratio is high, in order to reduce the impact on the intersection turn left car, reduce the delay to improve the traffic capacity, in addition to setting the left lane or turn left special phase, set up the left hander to turn area is a more effective solution.

Through time and space reasonable setting make part of the left turn vehicles entering the intersection ahead of time, make full use of the left phase of green time, in a certain green light time increase the number of left turn vehicles through the intersection, so as to increase the traffic capacity of intersection, especially the left car traffic capacity.

"Turn left turn to the concept"

Left hander to turn area refers to the left before import way to draw an area as a waiting area, when not after turn left turn to the flow to light up the green light, turn left vehicles entering stay area waiting for; Until the left hander to turn lights up when the green light, to turn the vehicle to continue to go forward, through the intersection. In the whole process, don't need to increase imports of signal time and left lane number, only need to increase the length of the left lane, improve the traffic capacity of the left lane.

1, turn left and go straight full red signal, motor vehicle should be at the intersection you waiting for the go-ahead;

2, when straight light green light, turn left turn vehicles into the left turn to area waiting for the go-ahead;

3, when the left turn signal lamp lights up, waiting to turn the vehicle through the intersection quickly.

"Turn left turn to the set type"

According to the intersection of different road conditions, respectively for the ordinary type, bridge and the central space.

According to the import quantity is different, can be divided into single import has left hander to turn the corner and more import has left hander to turn the corner.

"Turn left turn to the suitable conditions"

Geometric critical condition: turn left at the left corner to turn area need parking space length is greater than or equal to 15 m, that is when the left turn to turn area at least, 3 cars left the car capacity can be significantly improved. In addition, in multiple import Settings turn left hander to zone, many strands of left turn traffic at the intersection of safe distance must conform to the relevant geometry size, usually is 2 m.

Critical traffic condition: set the left hander to turn area can effectively alleviate the overflow of left car, reduce the delays caused by overflow. Research shows that in flat peak period, if the red light of the unit cycle time left car full left lane, can consider to set the left hander to turn area.

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