All metropolis cities suffer from traffic obstruction issues, particularly within the central downtown. traditional cities will be remodeled into good cities by exploiting data and communication technologies. The signal temporal arrangement changes with the density of the traffic and delay are given the assistance of a microcontroller. The web of Things (IoT) will play an important role in the accomplishment of good cities. The aim of this project is to style a density-based stoplight system interfaced with a barrier gate. This project proposes a microcontroller for temporal arrangement modification of the signal and buzzer action. before the barrier gate, a stop line is created and with the assistance of another IR device, the vehicle is caterpillar-tracked whenever it approaches the stop line If the vehicle crosses the stop line the hint is given to the close room. Node MCU microcontroller is employed for signal temporal arrangement modification supported the density of traffic.