The GRE-IWG SLR is simplifying UN Lighting and Light-signalling Regulations through a two-stage process. Baseline documents for UN Regulations 48, 53, 74, and 86 have been prepared as carriers of technical amendments. Stage 2 work addresses improved visibility of rear direction indicators against stop lamps, apparent surface definitions, and correction of errors in UN Regulation 150.

Baseline document for stage 2 of UN Regulation No. 48, based on R48-09 (R48-08 up to Supplement 04 and WP.29/2024/28, WP.29/2025/36, with modifications agreed at GRE-92 and GRE-93

UN R53 series ⁰⁵ baseline amendments simplify the definition in paragraph 2 by deleting common definitions to UN R48, reducing from 49 original definitions to 27. Amendments align failure provision and EV inclusion with UN R48. The communication sheet is amended to align with UN R48. Terminology and format alignment with UN R48 and UN R74 is applied. Previous technical prescriptions are moved to a reference document, keeping only the latest. Paragraphs 6.×.4 and 6.×.5 are simplified, aligning with UN R48. An open point questions whether Annex 1 Communication form should refer to a specific Series of Amendments to R48 definitions.

This amendment modifies definitions in paragraph 2, consolidates general specifications in paragraphs 5 and 6, simplifies failure provisions, includes electric vehicles, aligns terminology with UN R48 baseline and standardizes vehicle category references to “vehicles of category(ies),” corrects AFS provision references, applies scientific notation with lumens, aligns approval number text with UN R48, corrects signal lamp category numbering, uses category symbols instead

Proposal to amend UN R74 series 04 by simplifying the definition in paragraph 2 through deletion of common definitions to UN R48, applying amendments for failure provision and EV inclusion, aligning terminology and format with UN R48 and UN R53, retaining only the latest transitional provisions, simplifying paragraphs 6.×.4 and 6.×.5, and providing editable pictures.

Proposal to amend the definitions ; add EV inclusion; clarify individual and general provisions, failure provisions, and transitional provisions; correct signal lamp category; use category symbol instead of lamp function name;

UN R86 baseline amendments add agricultural non-road mobile machinery to scope. Definitions are simplified by removing common vehicle definitions and aligning structure with UN R48. Headlamps symmetrical classes are reviewed following CLEPA comment. Side retro-reflector requirements align with EU requirements on location. Direction-indicator lamps alignment with EU scope for tractors remains an open point.

Proposal applies to vehicles of categories T, R, and S and agricultural NRMM regarding lighting and light-signalling device installation. The regulation establishes approval procedures, general specifications for lamp fitting and adjustment, electrical connections, and individual specifications for various lighting functions including driving-beam and passing-beam headlamps, direction-indicator lamps, stop lamps, position lamps, retro-reflectors, and other light-signalling devices. It specifies position requirements (height, width, length), geometric visibility angles, colour requirements, and electrical interconnection rules. Transitional provisions address implementation across different amendment series, with staggered acceptance periods for type-approvals granted under preceding series of amendments.

Proposal for editorial work with thorough review and consistency improvements. New informative Annexes for lamp positioning and geometric visibility angles are added. Technical prescriptions now pertain only to the new series. Light source provisions are clarified regarding technological neutrality, usage of light source modules, and non-replaceable light sources.

The 79th SLR Informal Working Group Meeting will be held 7–11 September 2026 at JASIC Meeting Room, 7th Floor, Zennihon Truck Sogo Kaikan, 3-2-5 Yotsuya, Shinjuku-ku, Tokyo 160-0004, Japan. The meeting schedule, venue, and other details are expected to be finalized in the later half of May. The document provides hotel accommodation options, airport information, and local transit guidance for attendees.

SLR-76 session documents are available on the SLR website. Actions include: correcting errors in UN R150 for submission to GRE-94; preparing Stage 2/Step 2 baseline documents for UN R48, R53, R74, and R86; finalizing simplification of paragraphs 6.×.4 and 6.×.5; discussing apparent surface methodology; approving technological neutrality amendments to UN R48 and R149; collecting literature on rear direction indicator visibility; and reviewing harmonization requirements. SLR-77 meeting scheduled April 15-17, 2026 in Brussels.

Michael J. Flannagan, Michael Sivak, Eric C. Traube: The University of Michigan Transportation Research Institute.

Proposal to enable the phasing out of the installation of older lamps and devices pursuant to the simplification of lighting regulations (UN R148, 149, and 150).

Proposal to enable the phasing out of the installation of older lamps/devices pursuant to the simplification of lighting regulations under GRE.

Proposal to enable the phasing out of the installation of older lamps/devices pursuant to the simplification of lighting regulations under GRE.

Revision of text in document GRE/2023/3 from the SLR informal group to enable the phasing out of the installation of older lamps and devices following the measures undertaken pursuant to the simplification of lighting regulations under GRE.

Proposal from the SLR informal group to introduce new requirements for headlamp levelling, in particular on the vertical inclination in relation to the dipped-beam headlamp mounting height, and to allow manual levelling only for off-road vehicles.

Proposal to enable the phasing out of the installation of older lamps and devices following the measures undertaken pursuant to the simplification of lighting regulations under GRE.

Proposal to enable the phasing out of the installation of older lamps and devices pursuant to the simplification of lighting regulations under GRE.

Proposal to enable the phasing out of the installation of older lamps/devices pursuant to the simplification of lighting regulations under GRE.

Proposal to enable the phasing out of the installation of older lamps/devices pursuant to the simplification of lighting regulations under GRE.

Proposals to enable the phasing out of older lamps/devices.

Draft text to enable the phasing out of older lamps and devices.

Draft text to enable the phasing out of older lamps and devices.

Revised text based on document GRE-87-09.

Proposal including transitional provisions and justifications.

Proposal includes transitional provisions and justification.