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And in the above scheme vehicles are allowed to make a free right turn so we need to consider only two directions straight and left. The traffic flow can be classified in to four phases in the above diagram and i have considered the North as starting point of this traffic flow. I have chose this one for easier explanation of the traffic flow. And this is just a model of the four way road ,schemes and layout may subjected to change. The above diagram illustrates the traffic flow layout of the four way road. Here we are using 6 MHz crystal for the 8051 Microcontroller operation and you can use upto 12MHz crystal with this controller. That means logic 0 signal in the Microcontroller switches the LED ON and logic 1 signal switches the LED off. In this configuration the Microcontroller was used to sink the current from the LED to its ports. The LED’s which was used as lights was connected to the Microcontroller by means of common Anode configuration.

This system uses 8051 microcontroller ( AT89C52), 7-segments and LED’s for indication.

This is the four way traffic light system using embedded systems which was bit complex in nature as we need to consider the traffic flow in four different directions providing appropriate timings to each of the lights. I have previously posted a simple Traffic light system for one way roads with small timings check it out if you are interested in it. Traffic light system was one of the fascinating applications of Embedded systems and have been using the same till this day.