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Intelligent traffic signal system plays an indispensable role in the current intelligent system of urban transportation, and it plays a vital role in urban development and economic construction. PLC (Programmable Logic Controller) is a general-purpose industrial control device widely used in the design of automatic control systems for industrial automation and mechanical production. With its various functions, low price and easy to use, PLC has become more and more important in industrial production. This paper will design an intelligent traffic signal system based on PLC that can handle complex traffic conditions at intersections.