In an ADAS system, ultrasonic sensors play an important role in the parking of vehicles, avoiding obstacles in blind spots, and detecting pedestrians. One of the companies providing ultrasound sensors for ADAS systems is Murata (http://www.murata.com/). They provide ultrasonic sensors for up to 10 meters, which are optimum for a parking assistance system (PAS). The following diagram shows where ultrasonic sensors are placed on a car: