| UN R13: Proposal for a Supplement 3 to the 14 series of amendments | |
| Reference Number: WP.29/2026/11 | |
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Proposal to:
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| Meeting Sessions: 198th WP.29 session (9-13 Mar) | |
| Document date: 23 Dec 25 | |
| Document status: Adopted by WP.29 | |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion | |
| Adoption Vote | |
| This proposal (WP.29/2026/11) was adopted by the World Forum. Thirty-four Contracting Parties out of the 54 applying UN R13 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining. | |
| Click here to view the full document file | |
| UN R13: Proposal for a Supplement 6 to the 13 series of amendments | |
| Reference Number: WP.29/2026/12 | |
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Proposal to:
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| Meeting Sessions: 198th WP.29 session (9-13 Mar) | |
| Document date: 23 Dec 25 | |
| Document status: Adopted by WP.29 | |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion | |
| Adoption Vote | |
| This proposal (WP.29/2026/12) was adopted by the World Forum. Thirty-four Contracting Parties out of the 54 applying UN R13 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining. | |
| Click here to view the full document file | |
| UN R13: Proposal for a Supplement 8 to the 12 series of amendments | |
| Reference Number: WP.29/2026/13 | |
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Proposal to:
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| Submitted by: GRVA | |
| Meeting Sessions: 198th WP.29 session (9-13 Mar) | |
| Document date: 23 Dec 25 | |
| Document status: Adopted by WP.29 | |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion | |
| Adoption Vote | |
| This proposal (WP.29/2026/13) was adopted by the World Forum. Thirty-four Contracting Parties out of the 54 applying UN R13 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining. | |
| Click here to view the full document file | |
| UN R13: Proposal for a Supplement 2 to the 15 series of amendments | |
| Reference Number: WP.29/2026/6 | |
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Proposal to
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| Meeting Sessions: 198th WP.29 session (9-13 Mar) | |
| Document date: 22 Dec 25 | |
| Document status: Adopted by WP.29 | |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion | |
| Adoption Vote | |
| This proposal (WP.29/2026/6) was adopted by the World Forum. Thirty-four Contracting Parties out of the 54 applying UN R13 were present for the vote by AC.1. Thirty-four voted in favor with zero against and zero abstaining. | |
| Click here to view the full document file | |
| e-Axles and e-Trailers: Supporting information |
| Reference Number: GRVA-23-41 |
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This document proposes amendments to UN Regulation 13 for trailers with dynamo function, superseding GRVA-22-26, GRVA-2025-15, and GRVA-21-12. The dynamo function converts vehicle kinetic energy into electrical energy without affecting braking system forces and is limited to trailers of category O2, O3, and O4 pending further development. Maximum retardation power limits are 22 kW for O3/O4 trailers and 2 kW for O2 trailers, measured using specified methods. Requirements include wheel locking prevention with braking rate not exceeding 0.04 per wheel, functional safety assessment per Annex 18, and demonstration that anti-lock and stability control systems comply when dynamo function is enabled. The dynamo function shall not be used during brake application testing. Administrative amendments update Annexes 2, 4, 5, 10, 19, 20, and 21 to reference e-axles and dynamo functions. |
| Submitted by: CLCCR, CLEPA, and OICA |
| Meeting Sessions: 23rd GRVA session (22-25 Sep 2025) |
| Document date: 25 Sep 25 |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion |
| Click here to view the full document file |
| UN R13: Status of work on the approval of eTrailers |
| Reference Number: GRVA-22-25 |
| Submitted by: CLEPA |
| Meeting Sessions: 22nd GRVA session (2-6 Jun 2025) |
| Document date: 01 Jun 25 |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion |
| Click here to view the full document file |
| UN R13: Proposal for amendments to document GRVA/2025/15 |
| Reference Number: GRVA-22-26 |
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Proposal to add definitions for “e-axle”, “e-axle trailer”, and “dynamo function” for trailers of category O3 and O4, amend paragraph 2.2.2.4. to reference electric regenerative braking systems and electric propulsion systems, insert new paragraphs 5.2.2.26.1. through 5.2.2.26.5. establishing special requirements for dynamo function including maximum retardation power of 20kW, wheel locking prevention at speeds above 15 km/h, and assessment according to Annex 18, insert requirements in Annex 4 to switch off electric regenerative braking systems and dynamo function during brake applications and tests, and amend Annex 19 Appendices 5 and 7 to include e-Axles in schematic diagram considerations. This document is based on GRVA/2025/15 and GRVA-21-12. |
| Submitted by: CLEPA |
| Meeting Sessions: 22nd GRVA session (2-6 Jun 2025) |
| Document date: 01 Jun 25 |
| Document status: Superseded |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion |
| Click here to view the full document file |
| UN R13: Proposal to amend document GRVA/2025/15 |
| Reference Number: GRVA-21-12 |
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Proposal to amend para. 2.2.2.4. to include electric regenerative braking system and electric propulsion system, amend para. 2.21. to define Electric Regenerative Braking (ERB), add para. 2.56. to define e-trailer, amend para. 5.2.2.7. regarding braking surface connection and electrical regenerative braking system disconnection, insert para. 5.2.2.26. establishing special requirements for e-trailers and trailers equipped with ERB of Category O3 or O4, insert Annex 4 paras. 1.7.1.3., 3.1.2.6., and 3.1.3.5. requiring ERB system deactivation during brake applications and tests, insert Annex 13 para. 4.7. requiring anti-lock braking system for vehicles with ERB, and amend Annex 16 tables to include trailer regenerative system parameters, based on GRVA/2025/15. |
| Submitted by: CLCCR, CLEPA, and OICA |
| Meeting Sessions: 21st GRVA session (20-24 Jan 2025) |
| Document date: 16 Jan 25 |
| Document status: Superseded |
| Relevant to: UN Regulation No. 13 | Heavy-Duty Vehicle Braking and WP.29 Regulatory Project | Trailer-axle energy and propulsion |
| Click here to view the full document file |
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