An accident occurred where an N1 security vehicle fatally injured a child who was crossing the entrance to a supermarket car park. The vehicle had been modified from the original specification of the manufacturer by the removal of the side windows and the fitting of plastic glazing on both sides of the driver’s cab area, and a frame of strengthening material fitted to the replacement glazing. This reduced the side vision for the driver of the vehicle. Since UN R125 applies to M1 vehicles, the UK seeks guidance from GRSG on the application of UN R125 provisions to N1 vehicles.