Road accidents frequently lead to severe injuries and fatalities due to delays in emergency assistance. This work presents an Arduino-based Intelligent Accident Detection and SOS Alert Mechanism for automatic accident identification and emergency notification. The system employs an ADXL335 accelerometer to monitor sudden impact events, while a NEO-6M GPS module determines the vehicle location. Upon detecting an accident, an Arduino Uno processes the sensor data and activates a SIM800L GSM module to transmit an alert message containing location details and initiate an emergency call. A manual SOS feature is also incorporated to enable users to request assistance during critical situations. Experimental testing demonstrated reliable accident detection and timely communication of emergency information. The proposed system offers a simple, economical, and effective approach for improving road safety and reducing emergency response time.