The smart accident detection and alert system using IoT is a technical solution that detects accidents and alerts authorities and emergency services. The system mainly relies on sensors, GPS, and Arduino UNO to detect and collect information about the location and severity of the accident. The system then transmits this information in real time to the appropriate authorities using algorithms and protocols, enabling them to respond quickly and effectively, therefore increasing the possibility of saving lives and benefiting road users, emergency services, and transportation authorities in case of accidents.