Model S has several sensors designed to detect the presence of objects. When driving slowly in Drive or Reverse (for example, when parking), the vehicle alerts you if an object is detected in close proximity of your Model S. Objects are only detected in your chosen direction; front objects in Drive, rear objects in Reverse.
WARNING: You may not be alerted if Model S rolls freely in the opposite direction (for example, Park Assist does not display an alert if Model S rolls backwards down a hill while in Drive).
The sensors are activated when driving slower than 5 mph (8 km/h).
WARNING: Never depend on Park Assist to inform you if an area you are approaching is free of objects and/or people. Several external factors can reduce the performance of Park Assist, causing either no readings or false readings (see Limitations and False Warnings). Therefore, depending on Park Assist to determine if Model S is approaching an obstruction can result in damage to the vehicle and/or objects, and can potentially cause serious injury. Always inspect the area with your own eyes. When reversing, perform shoulder checks and use all mirrors. Park assist does not detect children, pedestrians, bicyclists, animals, or objects that are moving, protruding, located too far above or below the sensors, or too close or too far from the sensors. Park Assist is for guidance purposes only and is not intended to replace your own direct visual checks. It is not a substitute for careful driving.