| UN R165 Reversing Warning | Audible Reversing Warning Systems | At the 168th WP.29 session (March 2016), Turkey proposed a new UN Regulation to establish requirements for audible alerting devices to signal other road users when a vehicle is moving in reverse at slow speeds. WP.29 referred this proposal to GRB for consideration. Reversing Warning Audible Reversing Warning Systems UN Regulation No. 165 UN R165 | UNR | 165 |