ABSTRACT The Growth of population is increasing day by day along with the technology. According to recent survey, the accidents are the main causes of death in developing countries. The most dangerous accident-prone areas are on mountain roads have many narrow curve roads, Hair pin bend curves and on T-roads. Mountains have mini narrow curves due to this curve’s drivers can’t able to see the vehicles /obstacles that are coming from the other side of the curve. The main prospective of this project is to save trees from severe accidents that occur on mountain roads. In this project the system contains sensors which are powered by Arduino uno, it includes IR sensors, LED lights and buzzer. When two vehicles pass from the opposite side of a curve on mountain roads. The IR sensor detects the vehicle, The LED colour changes to red and raises the Buzzer, giving signal of danger. This alerts driver to prevent accidents on mountain curve roads. Keywords: Arduino Uno, Proximity sensor, Buzzer, LED, accidents, Mountain Curves, System.