Traffic congestion is a serious problem in many cities around the world so it is time to switch to more manual mode or timer-timer mode to a more automated decision-making system. The current traffic signals system is based on a fixed time which may cause malfunction if one route works better than the other. To address this issue we have developed a smart traffic management system framework. Sometimes high traffic congestion on one side of the junction requires a longer green time compared to the allotted time. Therefore, we suggest here the way in which the time of green light and red light is allocated on the basis of existing traffic congestion. at that time. This is achieved by using an ultrasonic sensor. When the density is calculated, the bright time of the green light is allocated with the help of a microcontroller (Arduino). Sensors located on the side of the road will detect the presence of vehicles and send information to the microcontroller where it will determine how long the flank will be open or when to switch on signal lights. In the following sections, we have described in detail the process of this framework.