Proposal for a 03 series of amendments, modifying para. 5.4.1.4 (Table 5) to change emission limits for Classes 1, 2, and 3, amending para. 5.4.2.2 to establish CO measurement requirements at idle, adding para. 5.4.4.3 to establish requirements for O₂ content and lambda measurement at high idle with specified calculation methods, modifying para. 12 to change transitional provision references from 02 to 03 series, and inserting comprehensive new technical requirements throughout Annexes 1 through 7 and their Appendices 1 through 12 concerning vehicle propulsion unit families, test procedures for Type I, Type II and Type VII tests, exhaust dilution systems, driving cycles, gearshift procedures, reference fuels, chassis dynamometer specifications, and related emissions testing methodologies applicable to vehicles of category L₃, L₄ and L₅.

Proposal to amend Annex 7, paragraph 3.1, to add provisions allowing discard of test runs when additional operating conditions lead to riding conditions not expected to occur in real traffic such as front wheel lift up, apparent wheel spin, chain slap, or engine lugging, and amend paragraph 3.2.2 to specify that if unusual riding conditions occur during testing, the test shall be performed in the next higher gear and maximum vehicle speed shall be reached at line BB’ instead, thereby ensuring consistency with the 05 and 06 series of UN Regulation No. 41.

Proposal to amend multiple paragraphs in UN R53. Changes include: paragraph 5.3. to add tolerance specifications and manufacturer fitting requirements; paragraphs 5.6.2.1., 5.6.2.2., and 5.6.2.3. to reference UN Regulation No. 48; paragraph 5.8.1. to clarify direction indicator lamp photometric characteristics; paragraph 5.19.2. regarding dual lamp assemblies marked “D”; paragraph 6.1.7.2. for HIAS failure tell-tale specifications; paragraphs 6.2.4., 6.3.3.1., 6.10.4., and 6.11.4. to define geometric visibility angles; paragraph 6.9.3. for circuit-closed tell-tale requirements; Annex 1 paragraphs 9 to 10

Proposal to correct mistakes found in the current 04 series of amendments and align with UN R48, with appropriate adaptation of L category vehicles.

roposal to expand the application of glare-free Adaptive Driving Beam (ADB) for category L₃ motorcycles under UN R149, by introducing additional driving beam classes aligned with UN R53 motorcycle requirements and adding symmetrical passing beam-based photometric requirements below the H-H line (Table 13, Part C). Recent technological advances have made ADB electronics more practical for a broader range of motorcycles, and these amendments aim to enhance traffic safety by reducing glare while maintaining adequate rider visibility.

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.

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.

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.

This document proposes draft provisions for a 05 series, updating the previous baseline (SLR-71-07). Key changes include simplification of definitions by referencing UN R48 where applicable; consolidation of geometric visibility requirements with uniform formatting; incorporation of electric vehicle (EV) provisions; inclusion of rear-end collision alert signal (RECAS); replacement of legacy terminology with hyphenated forms (e.g., “direction-indicator lamp,” “type-approved”); use of scientific notation for luminous intensity values; and reduction of transitional provisions to retain only the 05 series requirements. Annex 3 has been reserved and deleted. The regulation applies to the installation of lighting and light-signalling devices on motorcycles and prescribes mandatory and optional devices with specifications for position, geometric visibility, orientation, electrical connections, and tell-tales. Transitional provision dates remain undecided.

The document considers options for the Communication form of UN R53 regarding whether to include the UN R48 series number. Option 1 retains the current form without the series number. Option 2 adopts the current Baseline document style. Option 3 adds an area in the comment section. Option 4 invites other ideas. Feedback is requested on which option should be adopted.

Proposal to amend UN R53:

• Simplify para. 2 by deleting vehicle type definition and consolidating definitions from UN Regulation No. 48,
• Consolidate para. 5 general specifications by reorganising lamp positioning requirements into para. 5.5. and 5.6., restructuring geometric visibility provisions, and clarifying electrical connections,
• Consolidate para. 6 individual specifications by standardising positioning formats into minimum/maximum height tables and reformatting geometric visibility angles into upwards/downwards/outwards/inwards notation,
• Delete para. 5.20. as its content moves to para. 5.6.,
• Delete Annex 3 as its content references UN Regulation No. 48,
• Simplify transitional provisions by deleting para. 11.1. through 11.11. and para. 11.12. and replacing with new para. 11.1. and 11.2. containing simplified provisions applicable to the 05 series of amendments with dates to be determined (1 September 20xx),
• Add Annexes 10 and 11 containing summary tables of lamp positioning and geometric visibility angles.

Proposal to amend UN R74:

• Simplify definitions by referring to UN Regulation No. 48,
• Replace vehicle type references with vehicles of category L₁,
• Use hyphens in “type-approved” and “direction-indicator lamp”,
• Add provisions for electric vehicle inclusion,
• Consolidate general and individual lamp specifications,
• Reorganize geometric visibility requirements into paragraphs 5.5 and 5.6,
• Add para. 5.22 regarding lamp operation requirements,
• Create summary tables in Annexes 6 and 7 for lamp positioning and geometric visibility angles,
• Revise approval marks in Annex 2,
• Reserve Annex 3,
• Establish transitional provisions for the 04 series with dates to be determined (1 September [20xx]).