Description: There is a crossroads for the north-south direction of 1,3, 2,4 for the east-west direction. Each intersection are red, yellow and green three lights, the initial state for the four junctions of the red light, 2 seconds after the green phase at the junction of 1,3, 2,4 at the junction of the red light, 1,3 junction opened to traffic delay after 50 seconds, 1,3 junctions five seconds after the green light flashes a green light out, bright yellow, 5 seconds later, the red light at the junction of 1,3, while the green at the junction of 2,4, 2,4 junction opened to traffic delay 30 seconds later, 2,4 junctions five seconds after the green light flashes a green light out, bright yellow, 5 seconds later, the red light at the junction of 2,4, 1,3 at the same time the red light at the junction (that is, the red light at the junction of four ), 2 seconds after the green phase at the junction of 1,3, 2,4 at the junction of the red light, repeat the above process.
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