This document proposes a notification service to prevent accidents using vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communication. The system would warn drivers about accidents and hazardous road conditions using messages of different priorities sent between vehicles and roadside units (RSUs). A VANET simulation shows how safety messages reduce driver response time during emergencies. The new communication system improves bandwidth usage for low priority messages containing traffic and weather data shared between RSUs. The simulation results demonstrate that intelligent transportation systems can significantly decrease driver response times and improve road safety.