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Part of the design task requires the controller state transition diagrams and flow charts traffic signal controller: the controller for the traffic light intersection. Experimental requirements: (1) east-west direction have a group of red, yellow, green light for directing traffic, red, yellow and green are the duration of 25s, 5s, 20s. (2) When there is an emergency situation (such as fire engines), the two directions are the red light, time stops, when the end of special circumstances, the controller to restore the original state of work. (3) two sets of digital control to display the countdown in both directions to allow access or prohibit the passage of time.