GAR | WP.29-198

UN R13: Proposal for a Supplement 2 to the 15 series of amendments
Reference Number: WP.29/2026/6
Proposal to Enable real-time reading of electrical transmission brake demand values via an OBD connector and scan tool during periodical technical inspections, Clarify that only one braking control (e.g., service braking control, parking brake control) shall be used for each test condition of the secondary braking effectiveness and to permit the selection of the braking control based on the vehicle load condition, and Establish definitions for “e-axle”, “e-axle trailer” and “dynamo function” and to establish provisions for the approval of e-axle trailers with regard to their “dynamo function”.
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.
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UN R13: Proposal for a Supplement 3 to the 14 series of amendments
Reference Number: WP.29/2026/11
Proposal to: Enable real-time reading of electrical transmission brake demand values via an OBD connector and scan tool during periodical technical inspections, Clarify that only one braking control (e.g., service braking control, parking brake control) shall be used for each test condition of the secondary braking effectiveness and to permit the selection of the braking control based on the vehicle load condition, Establish definitions for “e-axle”, “e-axle trailer” and “dynamo function” and to establish provisions for the approval of e-axle trailers with regard to their “dynamo function”.
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
Proposal to: Clarify that only one braking control (e.g., service braking control, parking brake control) shall be used for each test condition of the secondary braking effectiveness and permit the selection of the braking control based on the vehicle load condition, and Establish definitions for “e-axle”, “e-axle trailer” and “dynamo function” and provisions for the approval of e-axle trailers with regard to their “dynamo function”.
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
Proposal to: Clarify that only one braking control (e.g., service braking control, parking brake control) shall be used for each test condition of the secondary braking effectiveness and permit the selection of the braking control based on the vehicle load condition, and Establish definitions for “e-axle”, “e-axle trailer” and “dynamo function” and provisions for the approval of e-axle trailers with regard to their “dynamo function”.
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