This paper first introduces the history of the development of traffic lights, the history of development of micro-computer and computer application in various fields. Then the main chip on the PC 8086 and 8255 programmable parallel I/O interface chip functions and working principle to do a more detailed introduction, and then to these chips as the central device to design the traffic light control system for traffic lights to achieve the kindle and traffic lights to kindle the time control, display time output through 8255, by two-color LED lights indicate that the system the system practical, easy to operate.

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