Proposal to amend and supersede ECE/TRANS/GRSG/2026/11. Supplement 6 to UN R158 amends provisions for means of rear visibility and detection. The Regulation is amended to account for vehicles of categories X and Y. Vehicles of category Y and vehicles of category X without manual mode intended to be operated on-board are exempted. Vehicles equipped with Automated Driving Systems must comply when operated manually by a driver on-board. Alternative provisions apply for category X vehicles with manual operation other than seated in driver’s seat.