PCD is an abbreviation for Pre-Crash Detection, a safety feature that senses an impending collision and alerts the driver to take corrective action to avoid it. Synonyms for PCD include collision warning, driver assistance system, obstacle detection, and safety detection. These features are becoming increasingly common in modern vehicles as driving assist technologies improve. The PCD system combines radar, camera, and ultrasonic sensors to monitor the surroundings of the car and provide visual and audible warnings in case of an imminent collision. The primary objective of PCD is to enhance the safety of drivers, passengers, and pedestrians on the road and reduce the occurrence of accidents.