Road accidents caused by over-speeding are a major problem, especially in areas like school zones, hospitals, and residential areas. To improve road safety, an automatic vehicle speed control system using Radio Frequency (RF) technology is proposed. In this system, an RF transmitter is installed in restricted zones and an RF receiver is placed in the vehicle. When the vehicle enters the restricted area, the transmitter sends a signal that is received by the vehicle's receiver. The microcontroller processes this signal and automatically limits the vehicle speed. When the vehicle exits the restricted zone, the system restores the normal speed. This system helps reduce accidents and improves safety in sensitive areas.