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The purpose of this project is to prevent the vehicle accidents by using an alcohol detector in an effort to reduce traffic accident cases based on driving under the influence of alcohol. This project is developed by integrating the alcohol sensor with the microcontroller. The alcohol sensor used in this project is MQ-3 which is used to detect the alcohol content in human breath. The alcohol content level in blood is detected by the alcohol sensor from the human breath. The ignition system of the vehicle is operated based on this level thus providing as a safeguard against drunken driving.