UN R127 Supplement 5 (03 series) · UNECE Regulation No. 127 (ECE R127) — Uniform provisions concerning the approval of motor vehicles with regard to their pedestrian safety performance.
UN R127 — Supplement 5 to the 03 series of amendments
Supplement 4 → 5
- What changed
- For all tests to the windscreen, resultant acceleration and jerk versus time histories must be provided and evaluated against the atypical fracture criteria. New paragraphs 4.8. to 4.10. require the test results of the cowl monitoring area and the windscreen to be uploaded to DETA in English.
- Contracting Parties must continue to grant type approvals with the atypical windscreen fracture test proceedings until 1 September 2033 instead of 1 September 2028.
- For the upper legform impactor, the joint friction torque is now set to a minimum of 650 Nm but no more than 850 Nm. Before, it was set to 675 Nm ± 25 Nm.
- Why
- A clarification is needed that the definition of atypical windscreen fracture behaviour refers to the resultant acceleration of all three axes (x, y and z).
- Atypical behaviour during windscreen tests that meet the performance criteria may not be detected. So provisions are needed as a guideline of the scope of data that must always be provided during the type approval procedure.
- A moderate increase of the maximum torque setting is associated with no higher risk for damage to the impactor or the guidance system. But it may reduce the efforts and costs of the certification significantly.
Q1What changed28 changes
Atypical windscreen fracture criteria (para. 2.48.)
Criteria (a) and (b) of paragraph 2.48. now refer to the resultant headform acceleration. Criterion (a) now ends with “and/or” instead of “or”. Criterion (b) now says “10 ms” instead of “10 milliseconds”.
Windscreen test data and new Figure 6 (Annex 5, paras. 4.1. and 5.1.)
For all tests to the windscreen, resultant acceleration versus time and jerk versus time histories must be provided. They must be evaluated against the atypical fracture criteria according to paragraph 2.48. and reported for monitoring purposes according to paragraphs 4.8. to 4.10. New Figure 6 shows the evaluation of resultant acceleration and jerk for tests to the windscreen. A new note accepts both alternatives: 1 graph for each criterion or 1 graph for both criteria.
Sharing test results through DETA (paras. 4.8. to 4.10.)
Under paragraph 4.8., each Contracting Party, by its Approval Authority, must inform the other Approval Authorities about the cowl monitoring area and windscreen test results. This information must be shared when an approval is first granted, and with each extension when new tests in these areas have been performed. This information is intended to be shared for the collection and analysis of the cowl area and atypical windscreen fracture behaviour. Paragraph 4.9. requires the upload of this information in English to the secure internet database “DETA”. Paragraph 4.10. requires the Approval Authority to upload the type approval and these test results to DETA within 14 days after the day of granting. A new footnote gives the web address https://www.unece.org/trans/main/wp29/datasharing.html.
Additional character in the approval mark for WAD 2,100 boundary approvals (para. 4.4.3., Annex 2)
New paragraph 4.4.3. requires an additional character after the type approval number in the approval mark. This character distinguishes vehicles approved based upon the specific provisions related to WAD 2,100 boundary from vehicles approved with the extended WAD 2,500 boundary. The letter should be chosen according to paragraph 4.2. In Annex 2, the letter “T” now indicates an approval granted using the specific provisions on WAD 2,100 boundary in accordance with paragraph 11.9. The Annex 2 example mark also changes, and the text under the heading now refers to paragraphs 4.4. to 4.4.3.
Paragraphs 11.1. to 11.4. deleted and a new date in paragraph 11.9.
Paragraphs 11.1. to 11.4. are deleted. They dealt with the 02 series of amendments and with approvals to the original series and the 01 series. Under paragraph 11.9., type approvals with the atypical windscreen fracture test proceedings must continue to be granted until 1 September 2033, not 1 September 2028. The date for the specific provisions related to WAD 2,100 boundary stays 1 September 2028. Paragraphs 11.12. and 11.13. now refer to paragraph 2.1. instead of footnote 2 in paragraph 2.1. In Annex 1, the text under the table now refers to paragraphs 11.9 to 11.13 instead of 11.9 to 11.11.
Joint friction torque of the upper legform impactor (Annex 4, para. 3.5.; Annex 6, para. 2.4.1.)
The joint friction torque of the torque limiting joint is now set to a minimum of 650 Nm but no more than 850 Nm. Before, it was set to 675 Nm ± 25 Nm. The change is the same in Annex 4, paragraph 3.5., and in Annex 6, paragraph 2.4.1.
Footnote on the coordinate system now refers to M.R.1
The footnote on the coordinate system now refers to Annex B of Addendum 6 of Mutual Resolution No. 1 (M.R.1), document ECE/TRANS/WP.29/1101/Amend.5. Before, it referred to appendix 2 to Annex 1 of the Consolidated Resolution on the Construction of Vehicles (R.E.3), document ECE/TRANS/WP.29/78/Rev.6. The web address in the footnote also changes.
Q2Why it changed
- Proposed by
- Experts from Germany and the Kingdom of the Netherlands; expert from Germany (Annexes 4 and 6)
- Working party
- GRSP, 78th session (December 2025)
Reasons
Paragraph 2.48. contains the definition of atypical windscreen fracture behaviour. A clarification is needed that this definition refers to the resultant acceleration of all three axes (x, y and z).
Source
“A clarification is needed that the resultant acceleration of all three axes (x, y and z) is referred to in this definition.”
The change also clarifies that all three alternatives are allowed: criterion (a) only, criterion (b) only, or both (a) and (b).
Source
“Also it is clarified that all three alternatives are allowed:”
Paragraphs 4.8. and 5.8. of Annex 5 require tests with atypical windscreen fracture to be duly recorded in the test report. But atypical behaviour during windscreen tests that meet the performance criteria may not be detected. So provisions are needed as a guideline of the scope of data that must always be provided during the type approval procedure.
Sources (2)
“prescribe tests with atypical windscreen fracture to be duly recorded in the test report.”
“However, since atypical behaviour during windscreen tests meeting the performance criteria may not be detected, provisions are needed as a guideline of the scope of data that must always be provided during the type approval procedure.”
The proposals change the torque values of the upper legform impactor to avoid damaging it during tests.
Source
“with proposals to change the torque values of the upper legform impactor to avoid damaging it during tests.”
The relatively small corridor for the setting, with an upper limit of 700 Nm, may lead to unnecessary burden during the quasistatic certification. It is recommended to raise the upper limit to 850 Nm for a broader certification corridor. This moderate increase is associated with no higher risk for damage to the impactor or the guidance system. But it may reduce the efforts and costs of the certification significantly.
Sources (4)
“the relatively small corridor for the setting with an upper limit of 700 Nm may lead to unnecessary burden during the quasistatic certification.”
“Since a moderate increase of the maximum torque setting for obtaining a broader certification corridor is associated with no higher risk for damage to the impactor or the guidance system”
“but may reduce the efforts and costs of the certification significantly, it is recommended to raise the upper limit to 850 Nm.”
“For the full justification, please refer to ECE/TRANS/WP.29/GRSP/2025/39.”
Document trail
- —ProposalGRSP-77-38Informal proposal on windscreen test data by the Kingdom of the Netherlands and Germany
- —ProposalGRSP-77-27Informal proposal on the torque setting by Germany
- 2025-09ProposalECE/TRANS/WP.29/GRSP/2025/28Proposal by the experts from Germany and the Kingdom of the Netherlands
- 2025-09ProposalECE/TRANS/WP.29/GRSP/2025/40Proposal on the torque setting by the expert from Germany
- —Working party adoptsECE/TRANS/WP.29/GRSP/78Session report, paras. 28 and 30
- 2026-03Sent to WP.29ECE/TRANS/WP.29/2026/52Text that GRSP sent to WP.29 and AC.1
- 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, for all tests to the windscreen, resultant acceleration and jerk versus time histories are provided and evaluated.
- Make sure that the approval mark contains the additional character after the type approval number required by paragraph 4.4.3.
Component supplier
- No direct action for this role.
Technical service / Approval authority
- Check the upper legform impactor joint friction torque setting: a minimum of 650 Nm but no more than 850 Nm.
- For all tests to the windscreen, check that resultant acceleration and jerk histories are provided and evaluated against paragraph 2.48.
- Be ready for the upload of the cowl monitoring area and windscreen test results to DETA, in English.
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ⓘ This report gives advice only. It is not legal or type-approval advice.