The document describes the development of a fuzzy logic system for controlling a traffic light using MATLAB and a PLC. It involves creating input and output membership functions in MATLAB, developing rules to evaluate traffic conditions, and testing the fuzzy system in MATLAB before implementing it on a PLC. The fuzzy system reads sensor data on vehicle presence from the PLC and outputs traffic light states. The PLC uses ladder logic to interface between sensors, the fuzzy logic controller block, and traffic lights. The completed fuzzy system is tested in real-time to control traffic lights based on dynamic vehicle conditions.