28. The experts of the Task Force on Autonomous Vehicle Signalling Requirements (TF AVSR) briefed GRE on the WP.29 and AC.2 discussions on coordination of work on Automated Driving Systems (ADS), including the conditions, if any, under which an ADS external lighting signal should be activated (GRE-86-13). Pending recommendations of the Working Party on Automated/Autonomous and Connected Vehicles (GRVA) and AC.2 guidance on the issue, the experts of TF AVSR proposed reviewing UN Regulation No. 48 in the context of ADS with the aim to develop alternative switching of light signalling functions independent of the driver (GRE-86-12). GRE stressed the need to screen UN Regulation No. 48 to identify which amendments would be necessary to cater for ADS level 3 and below. GRE noted that TF AVSR would convene a kick-off meeting on this topic in June 2022 and encouraged all experts to participate.