What is the design of the traffic light control system

In is located in the intersection traffic signal control system, generally divided into east-west and south-north, as long as a direction at any moment, another direction for stop, continue to necessarily moment, short transition time by time, will exchange traffic ban direction.

The traffic condition changes from the beginning of condition 1, until condition 4 and then circulates to condition 1, and the cycle repeats, and the four conditions are summarized as follows:

The lights are red and the lights are green in the north and south, counting down to 27 seconds.

In this situation, dongxi was forbidden to pass through, and the south and north were allowed to pass.

Two, the direction red light is bright, north and south direction yellow light shine, countdown 3 seconds.

In this condition, the vehicle needs to wait for the condition to be changed except for the other vehicles that are already in transit.

3, the north and south lights are red, the lights are green and the countdown is 27 seconds.

In this situation, dongxi was allowed to pass, and south and north were forbidden to pass.

The north and south lights are red and the yellow light shines in the direction of three seconds.

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