The document describes the development of a microcontroller-based automobile speed limiting device and alarm control system. The system uses Arduino Nano microcontroller, infrared sensors, LCD display, LED indicators, buzzer, and push buttons. The infrared sensors detect vehicle speed and send signals to the microcontroller. The microcontroller then compares the speed to a preset limit and triggers the alarm and LED indicators if the limit is exceeded. The system was tested and found to function satisfactorily with a reading error of 5.83%. The speed limiting device could help reduce accidents from overspeeding.