Ultrasonic sensors are devices that use sound waves to detect and measure distances. They send out high-frequency sound waves and then listen for the echoes that bounce back, helping them to determine how far away an object is. Full definition
The available Forward and Reverse Sensing Systems use ultrasonic sensors in the bumpers to audibly alert you to certain objects when you're moving forward or backing up at a slow speed. (pompanoford.com)
It uses ultrasonic sensors in the front and rear of the vehicle to determine the location of other vehicles and objects nearby. (paulmillervw.com)
For instance, available enhanced active park assist uses ultrasonic sensors on the front and rear of the vehicle to help you guide your Edge into a suitable parallel or perpendicular parking space. (ford.com)