When the parking sensors detect a close object that the car may hit while traveling at a very slow speed, automatically apply the brake so the object is not hit. (Collision avoidance is a different feature for higher speeds using the radar).
Currently, the car will warn you if you are too close to an object. However, it will not auto-brake to avoid hitting an object such as a garbage can when going very slow. A few other cars have this feature.
Moderator: One reason this feature might be problematic if the parking sensor fails (which can occur if a large bug hits the sensor or ice buildup). That said, it could be offered with some kind of bypass.