1 Scope This standard specifies the general requirements, special prescription and inspection rules for the installation of the external lighting and light-signalling devices for motor vehicles and their trailers. This standard is applicable to Categories M, N and O motor vehicles and their trailers. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 3977 Specification of colors GB 4094 Symbols for controls, indicators and tell-tales of motor vehicles GB 4599 Motor vehicle headlamps equipped with filament lamps GB 4660 Photometric characteristics of power-driven vehicle front fog lamps GB 5920 Photometric characteristics of front and rear position lamps, end-outline marker lamps and stop lamps for motor vehicles and their trailers GB 11554 Photometric characteristics of rear fog lamp for power-driven vehicles and their trailers GB 11564 Retro-reflector device for motor vehicles GB 12676 Technical requirements and testing methods for commercial vehicle and trailer braking systems GB 15235 Photometric characteristics of reversing lamps for power-driven vehicles GB 15766.1 Lamps for road vehicles - Dimensional, electrical and luminous requirements GB 17509 Photometric characteristics of direction indicators for motor vehicles and their trailers GB 18099 Photometric characteristics of side-marker lamps for motor vehicles and their trailers GB 18408 Photometric characteristics of devices for the illumination of rear registration plates of motor vehicles and their trailers GB 18409 Photometric characteristics of parking lamps for power-driven vehicles GB 21259 Headlamps equipped with gas-discharge light sources for motor vehicle GB/T 21260 Headlamp cleaner GB 21670 Technical requirements and testing methods for passenger car braking systems GB 23254 Retro-reflective markings for trucks and trailers GB 23255 Photometric characteristics of daytime running lamps for power driven vehicles GB 25990 Rear-marking plates for vehicles and their trailers GB 25991 Automotive headlamps with LED light sources and/or LED modules GB/T 30036-2013 Adaptive front-lighting system for motor vehicles GB/T 30511 Photometric characteristics of cornering lamps for motor vehicle