Drunk driving and driving while intoxicated are the main causes of accidents in the modern world. Only drunk driving is a blame for the majority of preventable deaths i n t h e worldwide. The goal of this initiative is to shield the public from needless fatalities brought on by drunk driving related traffic accidents. We have created an automated engine locking mechanism for this project that uses alcohol breath as its input. The alcohol sensor MQ3, DC motor, and Arduino UNO are used in the project.The purpose of alcohol detection in the vehicle is to protect those who are seated inside. The alcohol content is detected using the alcohol sensor MQ3, and the detected signal is transformed into a digital signal that is directly managed by the micro-controller unit (MCU). The digital signal indicates that the vehicle is automatically controlled and cannot be driven by a driver who has consumed alcohol. This prevents drunk driving incidents.