Pedestrian Warning System (if equipped)
The Pedestrian Warning System causes Model S to emit sound when driving below approximately 24 km/h (15 mph) or while driving in reverse. Electric vehicles operate quietly and this sound helps to alert pedestrians of your oncoming vehicle. The sound, which activates whenever the setting is turned on (if equipped) and Model S is shifted out of Park, gets louder as speed increases.
In situations where you want to turn the sound off (such as in stop and go highway traffic), touch(if equipped). Your setting is retained until you manually change it.
It is strongly recommended that you turn on the Pedestrian Warning System immediately after the circumstances that required you to turn if off have passed.