UN R134 Supplement 1 (03 series) · UNECE Regulation No. 134 (ECE R134) — Uniform provisions concerning the approval of motor vehicles and their components with regard to the safety-related performance of Hydrogen-Fuelled Vehicles (HFCV).
UN R134 — Supplement 1 to the 03 series of amendments
Base text → Supplement 1
- What changed
- New section 0. says that the Regulation is amended to account for vehicles of category X.
- New paragraph 5.7.: the CHSS or vehicle manufacturer must provide periodic technical inspection (PTI) guidelines and identify any special conditions that would require immediate inspection.
- Paragraph 7.1.6. now says that, whilst an ADSF-2 is active, the warning must be transmitted as a logic signal to the ADS.
- Why
- The amendment intends to extend the application of the Regulation to vehicles without a driver and without manual driving controls inside the vehicle.
- The proposal in informal document GRSP-78-16-Rev.2 included PTI requirements, following France’s suggestion at the previous GRSP session.
- TF-H2 states that the amendment aims to clarify tables 3 and 4 of the Regulation.
Q1What changed37 changes
Vehicles of category X, vehicles with an ADS and ADS feature types (section 0., paras. 2.33. and 2.34.)
New section 0. says that the Regulation is amended to account for vehicles of category X. Without a driver or manual driving controls in the vehicle, related provisions must not be taken into account, unless this amendment already covers them. For vehicles with an ADS other than category X, no special provisions or exemptions apply in the manual driving mode. In a mode where an ADS feature is active, the relevant ADS requirements apply. New paragraph 2.33. defines ADSF-1 as an ADS feature which includes an ADS fallback response requiring a fallback user. New paragraph 2.34. defines ADSF-2 as an ADS feature which does not include an ADS fallback response requiring a fallback user.
Section 1.: new paragraph numbers and vehicles of category Y (paras. 1.1. and 1.2.)
In section 1., the first paragraph now has the number 1.1. Old paragraphs 1.1. and 1.2. are now paragraphs 1.1.1. and 1.1.2. New paragraph 1.2. says that this Regulation does not apply to vehicles of category Y. Paragraph 1.1.3. now has a dash after “Part III”. Old footnote 1 is now footnote 2. Its first sentence now says “the electric power train” instead of “electric power train”, and “or the post-crash” instead of “and the post crash”.
Periodic technical inspection (PTI) guidelines (paras. 2.19. and 5.7.)
New paragraph 2.19. defines “Periodic Technical Inspection (PTI)” as the inspection of the vehicle performed at specified intervals according to national regulations. New paragraph 5.7. requires the CHSS or vehicle manufacturer to give PTI guidelines, for example in the owner’s manual, a QR code or a web-link. This manufacturer must also identify any special conditions that would require immediate inspection, such as CHSS reinstallation, vehicle collision or fire, during its service life. Upon request, these guidelines must be made available to the type-approval authorities. Upon request, they must also be made available to the competent authorities in the Contracting Parties responsible for the periodic inspection of vehicles. Old paragraphs 2.19. to 2.31. are now paragraphs 2.20. to 2.32.
Warning to the ADS whilst an ADSF-2 is active (paras. 7.1.4.3. and 7.1.6.)
Paragraph 7.1.4.3. covers a single failure during operation that results in over 3.0 % hydrogen by volume in air in enclosed or semi-enclosed vehicle spaces. Then a warning must be provided, as before, or, whilst an ADSF-2 is active, transmitted as a logic signal to the ADS. Paragraph 7.1.4.3. also now says “3.0 %” and “4.0 %” instead of “3.0 per cent” and “4.0 per cent”. The heading of paragraph 7.1.6. now ends with “or ADS”. A new last paragraph of 7.1.6. says that, whilst an ADSF-2 is active, the warning must be transmitted as a logic signal to the ADS. This new paragraph also refers to the technical requirements of UN Regulation No. [XXX] according to its original version or later series of amendments.
Number of cycles in Annex 3, tables 3 and 4
In Annex 3, table 3, the first row of the “Number of cycles” column now says “60 per cent of initial cycle life (11 000 cycles)”. Before, it said “60 per cent the specified number of cycles determined in paragraph 5.1.2.”. In table 4, the first and second rows of this column now say “20 per cent of initial cycle life (11 000 cycles)”. Before, they said “20 per cent the specified number of cycles determined in paragraph 5.1.1.2.”.
Sensor location for vehicles of category X (Annex 5, paragraph 2.)
Annex 5, paragraph 2. gives the locations of the sensors before the crash impact. Location (a) is within 250 mm of the headliner above the driver’s seat or near the top centre of the passenger compartment. For vehicles of category X, the most forward passenger seat must now be taken instead of the driver's seat. The text also now says “of the passenger compartment” instead of “the passenger compartment”.
R.E.3 references in footnotes
Old footnote 2 is now footnote 1. It now refers to the Consolidated Resolution on the Construction of Vehicles (R.E.3.), document ECE/TRANS/WP.29/78/Rev.8 instead of /Rev.7. Footnote 2 of Annex 1 – Part 1, Model - III, paragraph 0.4. also now refers to /Rev.8 instead of /Rev.7.
Q2Why it changed
- Proposed by
- Expert from Germany on behalf of the GRSP Task Force on Automated Vehicles Regulation Screening (TF-AVRS); Task Force on Hydrogen Regulations (TF-H2)
- Working party
- GRSP, 78th session (December 2025)
Reasons
The Regulation was first written for vehicles with a driver and manual driving controls. The amendment intends to keep the spirit of the Regulation. It also intends to extend its application to vehicles without a driver and without manual driving controls inside the vehicle. The proposal by TF-AVRS was prepared to enable the application of the Regulation to vehicles equipped with an Automated Driving System (ADS).
Sources (3)
“The Regulation was originally drafted for vehicles with driver and manual driving controls”
“It is the intention of this amendment to keep the spirit of the regulation and to extend its application to vehicles without driver and without manual driving controls inside the vehicle”
“The text reproduced below was prepared by the expert from Germany on behalf of TF-AVRS, to enable the application of the regulation to vehicles equipped with an Automated Driving System (ADS).”
At its November 2025 session, WP.29 reaffirmed its objective for its June 2026 session. The objective is to adopt all documents related to the review of existing UN Regulations related to Automated Driving Systems (ADS).
Source
“at its November 2025 session, WP.29 reaffirmed its objective to adopt all documents related to the review of existing UN Regulations related to Automated Driving Systems (ADS) at its June 2026 session”
The proposal in informal document GRSP-78-16-Rev.2 included Periodical Technical Inspection (PTI) requirements, following France’s suggestion at the previous GRSP session.
Sources (2)
“Therefore, it had not been included in the proposal brought to this session (informal document GRSP-78-16-Rev.2)”
“This proposal, however, did include Periodical Technical Inspection (PTI) requirements, following France’s suggestion in the previous GRSP session.”
Proposer's reason (informal document GRSP-78-16-Rev.2)
France suggested taking PTI requirements that are already present in UN Regulation No. 110 into UN Regulation No. 134. In TF-H2, the experts suggested requirements to be fulfilled by the CHSS or vehicle manufacturer.
Submitted by Task Force on Hydrogen Regulations (TF-H2). Working party adoption: ECE/TRANS/WP.29/GRSP/78, para. 36.
Sources (2)
“France suggested including requirements on Periodic Technical Inspections (PTI) which are already present in UN Regulation No. 110 into UN Regulation No. 134”
“the experts suggested to include requirements to be fulfilled by the CHSS or vehicle manufacturer”
Proposer's reason (informal document GRSP-78-16-Rev.2)
When UN Regulation No. 134 was made, it was agreed to apply 11000 cycles. Supplement 4 to the original series and supplement 1 to the 01 series added the option to use 15000 cycles. The 02 series of amendments dropped this option, as UN GTR No. 13 phase 2 decided that 11000 cycles should be sufficient for 25 years. The amendment aims to clarify tables 3 and 4 of the Regulation.
Submitted by Task Force on Hydrogen Regulations (TF-H2). Working party adoption: ECE/TRANS/WP.29/GRSP/78, para. 36.
Sources (4)
“When UN Regulation No. 134 was made, it was agreed to apply 11000 cycles.”
“In supplement 4 to the original series of amendments and supplement 1 to the 01 series of amendments, the option to use 15000 cycles was added”
“while this option is dropped in the 02 series of amendments, as UN GTR No. 13 phase 2 decided that 11000 cycles should be sufficient for 25 years”
“The amendment aims to clarify tables 3 and 4 of this regulation.”
Document trail
- 2025-09ProposalECE/TRANS/WP.29/GRSP/2025/22Proposal by the expert from Germany on behalf of TF-AVRS
- —ProposalGRSP-78-16-Rev.2TF-H2 proposal to include requirements on periodic technical inspections
- —Amended in sessionGRSP-78-39-Rev.1TF-AVRS changes to ECE/TRANS/WP.29/GRSP/2025/22
- —Working party adoptsECE/TRANS/WP.29/GRSP/78GRSP session report, paras. 36 and 43 and Annex VII
- 2026-04Sent to WP.29ECE/TRANS/WP.29/2026/57Text that GRSP sent to WP.29 and AC.1
- —Amended in sessionWP.29-199-10Amendments for the AC.1 vote, reproduced in Annex VI of ECE/TRANS/WP.29/1192
- 2026-06-24WP.29 adoptsECE/TRANS/WP.29/1192Adopted at the 199th session (session report, para. 103)
- PendingIn forceDate not yet known
Q3Who is affected
Vehicle manufacturer
- Make sure that you or the CHSS manufacturer provide guidelines for the PTI (paragraph 5.7.).
- Make sure that you or the CHSS manufacturer identify any special conditions that would require immediate inspection (paragraph 5.7.).
- Be ready to make the PTI guidelines available upon request (paragraph 5.7.).
- Whilst an ADSF-2 is active, make sure the warning is transmitted as a logic signal to the ADS (paragraph 7.1.6.).
Component supplier
- As a CHSS manufacturer, be ready to provide guidelines for the PTI (paragraph 5.7.).
Technical service / Approval authority
- If the vehicle has no driver or manual driving controls, ignore related provisions unless this amendment already covers them.
- Do not apply this Regulation to vehicles of category Y (paragraph 1.2.).
- Use paragraphs 2.33. and 2.34. to decide if an ADS feature is ADSF-1 or ADSF-2.
- Whilst an ADSF-2 is active, check that the warning is transmitted as a logic signal to the ADS (paragraph 7.1.6.).
- For category X vehicles, take the most forward passenger seat instead of the driver's seat (Annex 5, sensor location (a)).
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ⓘ This report gives advice only. It is not legal or type-approval advice.