The HWT analyzed literature and expert knowledge to identify glare causes, performance negative effects, and improvable requirements for ADB/AFS systems. Key issues include wet road conditions, external objects obstructing sensors, soiled headlamps, and insufficient dynamic masking accuracy. Recommendations include improving headlamp cleaning enforcement, enhancing vehicle detection requirements, introducing motorway ADB usage, implementing adaptive cut-off lines, and providing manual override instructions.

The HWT analyzed literature and expert knowledge to identify glare causes, performance negative effects, and improvable requirements for ADB/AFS systems. Key issues include wet road conditions, external objects obstructing sensors, soiled headlamps, and insufficient dynamic masking accuracy. Recommendations include improving headlamp cleaning enforcement, enhancing vehicle detection requirements, introducing motorway ADB usage, implementing adaptive cut-off lines, and providing manual override instructions.

GTB proposes simplifying UN R48 by developing a single CAD-based method to determine apparent surface at early design stages. The proposal deletes the “light-emitting surface” definition and establishes “apparent surface” as the orthogonal projection of visible light-emitting surfaces in a specified observation direction. Amendments include revised definitions for lens, textured outer lens, illuminating surface, and apparent surface, with modified requirements for single lamps with multiple distinct parts. Distance requirements between adjacent parts are adjusted to 75mm or 200mm depending on lamp type.

OICA presents research findings on direction indicator perceptibility when stop lamps activate simultaneously. Key findings indicate that spatial separation between functions, increased direction indicator intensity, and relative signal dominance improve perception. Research shows stop lamp luminance can reduce direction indicator recognition, particularly in near-field viewing. OICA concludes that minimum size requirements proposed in the German proposal exceed available evidence and may create unintended consequences without demonstrated safety benefits.

The agenda includes corrections to UN R150-01, baseline documents for UN R53, R74, R86, and R48, simplification of paragraphs 6.×.4 and 6.×.5, transitional provisions, harmonisation of requirements, apparent surface considerations, and direction indicator visibility improvements. The next meetings are scheduled for June and December 2026, with a potential September 2026 session in Tokyo.