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Traffic light control system (8253 regular) is assumed to be a crossroads in the design of a traffic light control system. At the crossroads of East and West and North-South in both directions, each of red, yellow and green three lights. Red, yellow and green traffic lights change as follows: 1) green north-south direction, east-west direction at the same time the red light 20 seconds. 2) North-South direction to eliminate the green, yellow light 5 seconds, while east-west direction of the red light continues to light. 3) The north-south direction to eliminate the yellow light, red light, while east-west direction out of the red light, green light, sustained 20 seconds. 4) North-South direction of the red light continues to shine, while east-west direction out of the green, yellow light 5 seconds. 5) to 1) repeat.