Description: Crossroads of traffic lights, the north-south trunk road, the east-west road to support each crossing to install a set of traffic lights: red, yellow, green. Design crossroads traffic light controller, so that the traffic lights by the state 1 state 2 state 3 4 state law changes, circulation more than. State 1: things to green light, red light from north to south, the other lights all off, 30 seconds Status 2: something to yellow light, red light from north to south, the other lights all off, 5 seconds state 3: the red stuff light, green light from north to south, the other lights all off, 20 seconds Status 4: something to the red light, yellow light from north to south, the other lights all off, 5 seconds
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