Traffic signal according to the key phase of intersection vehicle arrives situation, using the induction control principle, the real-time optimization of the green time of each phase, and maintain the coordination of phase a bright moment invariant, change to ensure that the intersection of phase difference is not ideal, thus realize the main green wave control, road traffic green light time using the purpose of effectively.

Without cable induction signal coordination control is no cable coordinated control has several advantages:

1) ensure that, on the basis of the overall green wave band, can increase the width of the green wave band;

2) can be adjusted in real time in each phase of green time, decrease the loss of green time;

3) improving the efficiency of the intersection, reduce the intersection traffic delays.

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