| Simplification of Lighting Regulations: Agenda for the 75th (December 2025) session |
| Reference Number: SLR-75-01/Rev.1 |
| Meeting Sessions: 75th SLR session (10-12 Dec 2025) |
| Document date: 12 Dec 25 |
| 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, WP.29 Regulatory Project | Simplification of Lighting Regulations, 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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| Input for "apparent surface" lighting discussions |
| Reference Number: SLR-75-04 |
| Submitted by: GTB |
| Meeting Sessions: 75th SLR session (10-12 Dec 2025) |
| Document date: 28 Nov 25 |
| Relevant to: UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment, UN Regulation No. 148 | Light-Signalling Devices (LSD), and WP.29 Regulatory Project | Simplification of Lighting Regulations |
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| Rear direction indicator and stop signal visibility |
| Reference Number: SLR-75-11 |
|
The document presents OICA data on rear direction indicator (DI) and stop signal visibility compliance. It evaluates various lamp configurations against UN R48 and UN R148 requirements, examining criteria including photometry areas outside 25mm from stop lamps, DI apparent surface size, separation distances, and intensity ratios. OICA proposes that compliance requirements are met when DI apparent surface equals or exceeds stop lamp surface, intensity exceeds stop lamp by 25% minimum, separation distance reaches 20mm minimum, or DI apparent surface equals or exceeds 30cm. |
| Submitted by: OICA |
| Meeting Sessions: 75th SLR session (10-12 Dec 2025) |
| Document date: 03 Dec 25 |
| 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: Counter-proposal to SLR-73-08/Rev.1 |
| Reference Number: SLR-75-12 |
|
Proposal to amend UN R48 and UN R148 regarding direction indicator visibility when grouped with stop lamps. OICA proposes replacing Germany’s masking-based approach with objective, installation-level acceptance criteria: apparent surface area comparison, luminous intensity ratio at HV of at least 25% higher, or absolute apparent surface of 30 cm². Physical masking eliminates measurement uncertainty and improves test repeatability. Three alternative compliance routes provide flexibility without constraining designs. |
| Submitted by: OICA |
| Meeting Sessions: 75th SLR session (10-12 Dec 2025) |
| Document date: 03 Dec 25 |
| 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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| Comments on "apparent surface" discussions |
| Reference Number: SLR-75-15 |
| Submitted by: Poland |
| Meeting Sessions: 75th SLR session (10-12 Dec 2025) |
| Document date: 08 Dec 25 |
| Relevant to: UN Regulation No. 148 | Light-Signalling Devices (LSD) and UN Regulation No. 48 | Installation of Lighting and Lighting-Signalling Equipment |
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