Circuit-based traffic lights at a crossroads, 1,3 for the South and the North to 2,4 for the east-west direction, the initial state for the red lights at the junction of four full-liang. After the green light at the junction of 1,3, 2,4 at the junction of the red light, the direction of the opening of 1,3 junctions. Delayed for some time, put out the green light at the junction of 1,3, and 1,3 started flashing yellow light junctions. After several flashes, 1,3 at the junction of the red light, while the green light at the junction of 2,4, 2,4 junction opened to traffic. Delayed for some time, the green light junctions 2,4 extinguished, and the yellow light started blinking. After several flashes in the switch to the direction of 1,3 junctions. After repeat the process.

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