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.

CLIV is developing a new UN Regulation for vehicle categories M1, M2, M3, and N1 in Phase 2. The draft regulation requires visual and audible external warnings upon detection of a child left in a vehicle. Visual warnings use direction indicator lamps flashing in SOS morse code pattern for at least 15 seconds, then off for no more than 30 seconds, repeating for at least 10 minutes. Audible warnings must exceed 60dB(A) following the same timing pattern. The IWG requests guidance on potential amendments to UN R48, UN R28, and UN R165.

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 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.

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.

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.

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.

Proposal to amend para. 6.5.4. to permit an automated driving system to control the cleaning device while active and to require the cleaning device to operate through at least one cleaning period when headlamps are switched on and windscreen washers are operated, except for vehicles of categories X and Y, and insert a new footnote 4 defining automated driving system as in ECE/TRANS/WP.29/78/Rev.8, para. 2.

Draft amendments to UN R53 (based on SLR-71-07, SLR-71-7, SLR-66-01, SLR-73-07, SLR-75-05, and WP.29/2024/30) updates the baseline document for the 05 series of amendments. Key changes include: simplification of definitions and general specifications; consolidation of individual specifications; addition of EV inclusion and failure provisions; editorial harmonization with UN R48 baseline regarding hyphenation, terminology, and formatting; replacement of “visual failure tell-tale” with “tell-tale indicating failure” and “rear-end collision alert signal” with RECAS; standardization of vehicle category references; adoption of scientific notation with lumens; simplification of paragraphs 6.4 and 6; and revision of the transitional provisions.

Proposal to insert para. 2.5.22. defining direction indicator projector, insert paras. 2.7.12. and 2.7.13. defining basic element of a direction indicator projection and direction indicator projection, insert para. 3.2.10. requiring manufacturers to provide a list of patterns where direction indicator projections are provided, amend para. 5.9.1. to include direction indicator projections as flashing lamps, amend para. 5.15. to specify direction indicator projection colour as amber, insert para. 5.37. with general provisions for direction indicator projections including pattern explanation in owner’s handbook and automatic reduction of luminous intensity to 7.00×10³ cd or less when windshield wiper operates continuously for at least two minutes, insert para. 6.28. with detailed requirements for direction indicator projection presence, number, arrangement, position, projection area, orientation, electrical connections, and other requirements for vehicles of categories M₁–M₃, N₁–N₃, O₃, and O₄, insert item 9.32. in Annex 1 to the Communication Form, amend Annex 14 title, and insert new Annex 18 specifying chevron as the basic element for direction indicator projection patterns in amber colour.

Proposal to add provisions for Automated Driving Systems (ADS) in vehicle lighting and light-signalling functions, insert definitions for ADS-related terms and direction indicator projection, amend direction-indicator lamp definition to reference UN Regulations 97, 116, 162, and 163, add direction indicator projector definition, amend switch ON/OFF and activate/deactivate definitions to include ADS operation, insert definitions for basic elements and direction indicator projection, add requirements for direction indicator projection patterns in approval documentation, add driver seat position specification requirement, amend headlamp discomfort and ADS performance requirements across multiple paragraphs, insert main-beam control requirements for active ADS features, amend dipped-beam and front fog lamp provisions to account for ADS, add automatic alignment and luminous intensity adaptation provisions, amend side-marker lamp operation to permit ADS control, insert direction-indicator lamp flash requirements for ADS operation, add hazard warning signal control by ADS, amend interior lighting provisions, amend front-facing lighting unit height requirements for ADS-equipped vehicles without windscreens, insert ADS control requirements for cornering lamps and reversing lamps, amend Adaptive Front-lighting System (AFS) provisions to permit ADS control, insert new paragraph 6.28. establishing comprehensive direction indicator projection requirements including presence (optional), number, arrangement, position, projection area boundaries, orientation, electrical connections (flash synchronisation with direction-indicator lamps), tell-tale (optional), visual testing requirements, pattern restrictions, and operational restrictions based on vehicle speed and gear engagement, add Communication Form items for direction indicator projection luminous intensity and projector compliance, add item for ADS presence indication, add item for driver seat location specification, amend Annex 5 loading conditions to establish “seating position 1” terminology for the front seat nearest opposing traffic with provisions for ADS-equipped vehicles of categories X and Y, and insert new Annex 18 specifying the chevron as the sole basic element in amber for direction indicator projection patterns.

Baseline document for amending UN R74 (based on WP.29/2024/91, SLR-71-07, SLR-71-7, SLR-66-01, and SLR-73-07). Key changes include: simplifying definitions; using “type-approved” and “type-approval” with hyphens per UN R48; replacing “vehicle type (moped)” with “type of vehicles of category L₁”; adding hyphenation to “direction-indicator lamp”; deleting “above” from paragraph references; clarifying UN R48 series; removing “to this Regulation” after Annex references; applying scientific notation for lumens; including electric vehicles; revising individual and general provisions; correcting signal lamp category errors; and using category symbols instead of lamp function names.

Proposal to:

• Expand scope in paragraph 1. to include reversing projectors and direction indicator projectors
• Insert new paragraph 3.1.2.10. requiring drawings and measurement reports for direction indicator projectors tested with direction indicator lamps
• Amend Table 1 to add reversing projector, front direction indicator projector, and rear direction indicator projector entries
• Amend Table 2 to add corresponding change index entries
• Insert new paragraph 5.13. establishing luminous intensity requirements and specifications for direction indicator projectors
• Amend Annex 1 initial table to add reversing projector and direction indicator projector to lamp list
• Insert new item 9.1.8. in Annex 1 with communication form requirements for direction indicator projectors

Proposal to add new provisions defining terms related to automated driving systems (including Dynamic Driving Task, Automated Driving System, Operational Design Domain, and ADS feature), amend definitions of direction-indicator lamps, adaptive main beam, switching and activation functions, and movable components, insert definitions of direction indicator projectors and projections, add general and special requirements for direction indicator projections including patterns, luminous intensity limits, electrical connections, and operational constraints, amend requirements for vehicles equipped with an Automated Driving System including control of lighting functions, automatic operation provisions, testing methods, and applicability of driver-related requirements to categories X and Y vehicles, modify provisions for headlamp control, dipped-beam adjustment, fog lamp adaptation, reversing lamps, and Adaptive Front-lighting Systems to accommodate ADS operation, insert new communication form items for direction indicator projections and ADS presence, amend loading conditions in Annex 5 to reference seating position 1 instead of driver’s seat and add provisions for categories X and Y vehicles, retitle Annex 14, and insert new Annex 18 specifying chevron as the basic element for direction indicator projections in amber colour, effective upon entry into force as Supplement 4 to the 09 series of amendments.

Proposal to amend UN R10 by inserting new paragraphs to address Automated Driving System (ADS) requirements. The supplement to the 07 series of amendments extends the Regulation’s application to vehicles of categories X and Y equipped with an ADS, as well as conventional vehicles with an ADS, while maintaining the spirit of the original Regulation. Modifications include new definitions for “ADS test configuration,” revised immunity related functions to account for ADS sensor performance, and updated test conditions specifying that ADS shall be operational during testing. Alternative testing methods may be used when the ADS cannot function in the laboratory environment, subject to type-approval authority agreement.

Based on SLR-76-03-Rev1 for R48 and tentatively applying WP.29/2024/76, IMMA presents transitional provisions for UN R53. The document outlines provisions applicable to all amendment series, including that Contracting Parties may grant type-approvals according to any preceding series and shall continue granting extensions of existing approvals. For the 05 series of amendments, specific dates establish when Contracting Parties shall accept or refuse type-approvals, with exceptions for equipment, parts, and unaffected vehicle systems.

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.

Proposal to insert new definitions for “direction indicator projector,” “basic element,” and “direction indicator projection” in paragraph 2.5.22., 2.7.12., and 2.7.13.; amend paragraph 5.9.1. to include direction indicator projections as flashing lamps; amend paragraph 5.15. to specify amber colour for direction indicator projection; insert new paragraph 5.37. with general provisions for direction indicator projections; insert new paragraph 6.28. with detailed requirements for direction indicator projection presence, number, arrangement, position, projection area, orientation, electrical connections, and other requirements for vehicles of categories M, N, O₃, and O₄; insert new item 9.32. in Annex 1 with communication form entries; amend Annex 14 title; and insert new Annex 18 (Basic element to be used for direction indicator projection patterns).

FIA proposes that vehicles in automated mode in mixed traffic should be marked with one light visible from all sides. Marker lights should have uniform colour and shape clearly distinguished from other signal lights, be positioned at sufficient distance from signal lights and headlamps to avoid impairing visibility, and be designed to not glare other road users.

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.