<p>This project was undertaken as a final-year initiative aimed at addressingthe serious issue of accidents and damage caused by drunk driving. The system was designed around an Arduino Uno3 microcontroller connected to an alcohol detection sensor, which analyzes the driver’s breath. If alcohol is detected, the vehicle’s engine is automatically shut down, and an emergency siren is activated to warn others and prevent potential hazards. The alcohol sensor is strategically mounted on the steering wheel so that any excessive presence of alcohol beyond a <br /> set threshold disables the ignition system. The Arduino continuously monitors data from the sensor and activates a locking mechanism that prevents the engine from operating, thereby helping reduce the risk of accidents, injuries, and loss of property.</p>