UN Regulation No. 13-H
Light-Duty Vehicle Braking

Series of Amendments, Supplements, and Corrigenda

Text based upon a proposal from CLEPA and OICA as adopted by the Working Party on Brakes and Running Gear (GRRF) at its 74th session to harmonize UN R13-H with the Federal Motor Vehicle Safety Standard (FMVSS) 135 on electric vehicle requirements with regard to the regenerative braking system (RBS).

Proposal to clarify and update transitional provisions, including provisions for extensions of type approvals granted according to the antecedent requirements of the original approval. These amendments also relate to the transfer of brake-related telltale provisions to UN R121.

Proposal to delete provisions for electronic stability and brake-assist systems from UN R13-H as part of their transposition into new stand-alone regulations. This proposal also clarifies the requirements on electromagnetic compatibility via reference to Regulation No. 10.

Proposal to enable activation of the ESC optical symbol in cases of a corrective steering function intervention when the CSF intervention is activated under the control of an ESC system. The aim is to avoid separate requirements for brake-actuated and steering-actuated vehicle stability functions (VSF) that would lead to two optical warnings where only one is necessary. This would enable use of the ESC intervention tell-tale for CSF steering intervention.

89. In ECE/TRANS/WP.29/2018/8, the title, for “Supplement 1 to the 01 series”, read “Supplement 17 to the 00 series”.

Proposal to improve the uniformity of requirements for stop lamp illumination with regard to various types of braking systems, including those of electric vehicles.

Proposal to improve the uniformity of requirements for stop lamp illumination with regard to various types of braking systems, including those of electric vehicles.

94. The expert from OICA introduced GRVA-11-39, proposing amendments to ECE/TRANS/WP29/2021/73, recently adopted by WP.29 and AC.1. GRVA noted that the official document, currently notified by the Office of Legal Affairs to the Contracting Parties, could not be amended at this stage. GRVA requested the secretariat to distribute GRVA-11-39 as an amendment proposal to UN Regulation No. 13-H with an official symbol at the next session.

Proposal from GRVA to clarify paragraph 5.2.22.2. with regard to the deceleration thresholds for generating the braking light signal in the case of regenerative braking and/or automatically commanded braking.

130. The secretariat presented, on behalf of the GRVA Chair, the proposal for the 02 series of amendments to UN Regulation No. 131 (AEBS for heavy vehicles) pointing out its importance for road safety (item 4.8.1) according to road safety organisations. He also presented the proposal for the 01 series of amendments to UN Regulation No. 157 (ALKS) with the extension of the maximum design speed up to 130 km/h and provisions for automated lane changes (item 4.8.2).

131. The World Forum considered draft amendments under agenda items 4.8.1 to 4.8.8 and recommended their submission to AC.1 for voting, subject to the below amendment:

Agenda item 4.8.5., ECE/TRANS/WP.29/2022/79, title amend to read:

“Proposal for Supplement 4 to the 01 series of amendments to UN Regulation No. 13-H”

Proposal to ensure the continuity of the American Society for Testing and Materials (ASTM) Method E1337 for the measurement of the Peak Braking Coefficient (PBC) in UN Regulation No. 140, by introducing a reference to the new ASTM Standard Reference Test Tyre F2493.

Proposal to align the regulation with technical advances and the emergence of a new type of braking system that employs stored electrical energy for both the control transmission and the energy transmission. The proposal would also amend the requirements for the safety of electronic systems.

Proposal to adapt the regulation to allow for the approval of vehicles equipped with both an Automated Driving System and a manual driving mode.

Consolidated amendments from the FADS task force to the proposal to adapt UN R13-H provisions to enable application to ADS vehicles.