UN R53 baseline document for 05 series of amendments, based on SLR-71-07, WP.29/2024/30, SLR-66-01, SLR-73-07, and SLR-75-05, applies to vehicles of category L3 regarding lighting and light-signalling device installation. The Regulation establishes requirements for mandatory devices including driving-beam and passing-beam headlamps, direction-indicator lamps, stop lamps, rear-registration-plate illuminating devices, front and rear position lamps, and rear retro-reflectors. Optional devices include vehicle-hazard warning signals, fog lamps, daytime running lamps, emergency stop signals, exterior courtesy lamps, adaptive driving-beam, rear-end collision alert signal, and adaptive front lighting system. The document specifies technical requirements for lamp position, geometric visibility,