As the technology is improving day by day many things get controlled automatically .Here we are trying to design the project to automate the traffic control system.This system consists of multiple methods which can be used in traffic control light system.The project is aimed at designing a density based dynamic traffic signal system where the signal changes automatically on sensing the traffic density at the junction .Now-a-days traffic signaling system works on time basis which may arise a problem if one lane is operational than other.To optimize this problem traffic is measured in terms of density .We therefore propose a mechanism to avoid traffic congestion at the junction by measuring the density of vehicles on each path and the green light glows to that particular path in whichever the traffic is high. This paper presents traffic congestion.