abstract: Crossroads with traffic lights directing the safe operation of vehicles and pedestrians, to achieve the automatic traffic lights make traffic management command and work,To improve urban traffic management automation is an important landmark. Highway traffic light control to solve the problem would be to protect the traffic orderly, safe and efficient operation of the important part. But now there is a single traffic signal control system of fixed timing control can not be adjusted according to actual traffic control. PLC and the EDA are two new universal control device. It will relay the traditional PLC control technology, computer technology and communication technology integration, is designedDoors designed for industrial control, with strong functions, general flexibility, high reliability, good stability, anti-jamming can be strengthened, and programming is simple, easy to use and small size, light weight, low power, a number of advantages. EDA design using VHDL, traffic signal control system. And in the MAX + PLUSII system FPGA / CPLD chip to download, due to be generated is the integrated digital circuit, there is no system of wiring problems, so failure rate, high reliability, and size is very small.
