Reversing a vehicle is used as an intermediate step to complete a three point turn, J-turn, parallel park, or similar maneuver.
Extremely large or luxury vehicles may have in addition technical aids such as backup cameras.
Many industrial vehicles such as fork lifts automatically activate a repetitive warning beep whilst reversing.
[1] Harmonization of reverse warning sound of vehicles is planned by an adopted UNECE regulation for entry into force in January 2023.
[2] According to this regulation, "Audible reverse warning device" means a device, emitting an acoustic signal to the outside of a vehicle while reversing, which is intended to give audible warning of the presence of a vehicle.