2021 Tesla Model S Pedestrian Warning System The Pedestrian Warning System (if equipped) causes Model S to emit a sound when driving below 19 mph (32 km/h) 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 Model S is shifted out of Park, gets louder as speed increases. … Continue reading 2021 Tesla Model S Pedestrian Warning System Owners Manual