| Simplification of Lighting Regulations: Agenda for the 77th (April 2026) session |
| Reference Number: SLR-77-01/Rev.1 |
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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. |
| Meeting Sessions: 77th SLR session (15-17 Apr) |
| Document date: 21 Apr 26 |
| Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment, UN Regulation No. 53 | Installation of Motorcycle Lighting, UN Regulation No. 74 | Moped Lighting, UN Regulation No. 86 | Installation of Lighting and Lighting-Signalling Equipment on Tractors, UN Regulation No. 149 | Road Illumination Devices (RID), UN Regulation No. 148 | Light-Signalling Devices (LSD), and UN Regulation No. 150 | Retro-reflective Devices and Markings (RRD) |
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| Direction indicator visibility: Literature review |
| Reference Number: SLR-77-02 |
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A literature review on direction indicator visibility presents research on vehicle lighting design, visibility, and signalling. Sources include studies on overlapping and interlocking of lights, and dynamic evaluation of automobile rear lighting configurations. |
| Submitted by: Germany |
| Meeting Sessions: 77th SLR session (15-17 Apr) |
| Document date: 08 Apr 26 |
| Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment and UN Regulation No. 148 | Light-Signalling Devices (LSD) |
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| Analysis of separating direction indicators and stop lamps |
| Reference Number: SLR-77-03 |
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The document analyzes separating direction indicators and stop lamps. It examines how drivers recognize lighting functions through visual perception and notes that irregular lamp shapes increase reaction time. The document states that “apparent surface”, currently defined only through manufacturer drawings, lacks perceptual grounding because it ignores luminance distribution and edge contrast. It recommends minimum lamp sizes and distances based on visual acuity, minimum luminance requirements, and a 3:1 luminance contrast between functions when spatially merged in one lamp. |
| Submitted by: Poland |
| Meeting Sessions: 77th SLR session (15-17 Apr) |
| Document date: 08 Apr 26 |
| Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment and UN Regulation No. 148 | Light-Signalling Devices (LSD) |
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| Findings on available research on the reduced perceptibility of the direction indicator signal under simultaneous stop lamp activation |
| Reference Number: SLR-77-04 |
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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. |
| Submitted by: OICA |
| Meeting Sessions: 77th SLR session (15-17 Apr) |
| Document date: 08 Apr 26 |
| Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment and UN Regulation No. 148 | Light-Signalling Devices (LSD) |
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| Direction Indicator Lamp Height Issue |
| Reference Number: SLR-77-13 |
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This document addresses rear direction-indicator lamps mounted at low positions on vehicles. Republic of Korea reports increased public petitions and media articles regarding visibility and recognition concerns, particularly in congested traffic and for vehicles with higher driver seating positions like SUVs. UN Regulation No. 48 specifies direction-indicator lamp height requirements: not less than 350 mm and not more than 1,500 mm, or up to 2,100 mm under certain structural conditions. The presentation seeks feedback on similar issues from other countries and manufacturers. |
| Submitted by: KATRI |
| Meeting Sessions: 77th SLR session (15-17 Apr) |
| Document date: 14 Apr 26 |
| Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment and UN Regulation No. 148 | Light-Signalling Devices (LSD) |
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| Direction indicator visibility: Comments on SLR-76-10/Rev.1 |
| Reference Number: SLR-77-14 |
| Submitted by: Korea |
| Meeting Sessions: 77th SLR session (15-17 Apr) |
| Document date: 14 Apr 26 |
| Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment and UN Regulation No. 148 | Light-Signalling Devices (LSD) |
| Click here to view the full document file |
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