Traffic light control system design

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, after a moment a short transition time, will exchange traffic ban direction.

Traffic condition from 1 began to change, until 4 and loop until conditions 1, cycle, reduce the four conditions are as follows:

1, what direction turns red, north and south direction of green light, the countdown and 27 seconds.

Under this condition, east-west no thoroughfare, north and south to allow passage.

2, what direction turns red, the north-south direction yellow light is shining, the countdown 3 seconds.

Under this condition, in addition to now are popular in other cars so need to wait for state transformation.

3, north and south direction turns red, what direction the green light, the countdown and 27 seconds.

Under this condition, east-west promised to pass, north and south to no thoroughfare.

4, north and south direction turns red, yellow light shining things direction, the countdown 3 seconds.

Under this condition, in addition to now are popular in other cars so need to wait for state transformation.

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