Traffic Control System based on PLC and SCADA Techniques

This smart traffic control system uses Programmable Logic Controllers (PLC’s) and SCADA HMI for monitoring and controlling of traffic signals. This system is quite useful in high-traffic-density areas, toll gates and other high-end-parking areas.

Wikipedia quotes " A programmable logic controller (PLCPLC SCADA, or programmable controller is an industrial digital computer which has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, or robotic devices, or any activity that requires high reliability control and ease of programming and process fault diagnosis.

They were first developed in the automobile industry to provide flexible, ruggedized and easily programmable controllers to replace hard-wired relays and timers. Since then they have been widely adopted as high-reliability automation controllers suitable for harsh environments. A PLC is an example of a "hard" real-time system since output results must be produced in response to input conditions within a limited time, otherwise unintended operation will result."

This is a centralized control of traffic system where it collects the several places traffic conditions remotely through communication medium and this information is monitored using SCDA HMI. Therefore, synchronizing the traffic at different junction roads is possible with this system. And, also depending on the traffic density at different junctions, it controls the traffic light through remote operation.