UN R127 Base text (05 series) · UNECE Regulation No. 127 (ECE R127) — Uniform provisions concerning the approval of motor vehicles with regard to their pedestrian safety performance.
UN R127 — 05 series of amendments
Changes from 04 series of amendments (supplement 4)
- What changed
- New Annexes 7 and 8 give a test procedure for Deployable Pedestrian Protection Systems (DPPS) and a simulation procedure for the head impact time (HIT).
- When a vehicle is tested with DPPS activated, the test conditions and requirements in Annex 7 apply.
- The transitional provisions for the WAD 2,100 boundary and the BRRL are deleted, together with the extra character after the approval number.
- Why
- The 05 series transposes the DPPS provisions of UN GTR No. 9, Amendment 3 into UN Regulation No. 127.
- The test procedures for DPPS depend on the deployment status at the time of the head impact, so the head impact time must be known.
Q1What changed284 changes
Introduction to the 05 series (paras. 0.2. to 0.2.5.)
New paragraphs 0.2. to 0.2.5. explain the 05 series. It takes the DPPS test procedure and the HIT determination simulation from UN GTR No. 9, Amendment 3. A flowchart in the Appendix to Annex 7 gives a general guideline for the assessment of DPPS.
DPPS definitions and the detection test area (paras. 2., 2.50. to 2.61.)
New definitions 2.50. to 2.61. cover the DPPS and its timing. For example, they define the deployment module, the detection test area, the HIT and the total response time. New Figure 18 shows how to find the detection test area. For a vehicle with a DPPS, the measurements in chapter 2 must be taken with the system undeployed. Paragraph 2.31. now refers to paragraph 2.29. instead of 2.27.
Headform tests with DPPS activated (paras. 5.2. to 5.2.2.)
When a vehicle is tested with DPPS activated, the test conditions and requirements in Annex 7 apply. In paragraphs 5.2.1. and 5.2.2., the HIC requirements now also apply when tested to Annex 7, if applicable. When tested with DPPS activated, the vehicle must be adjusted as the Annex 7 test procedure specifies (Annex 3, paragraph 3.2.). Annex 1, Part 1, paragraph 9.23.1. now refers to Annex 7, paragraph 1.2. for DPPS.
New Annex 7: test procedure for DPPS
Annex 7 lists the prerequisites for testing with the DPPS activated, for example the system specification (paragraph 1.2.) and the sensing system verification. If a prerequisite is not met, the vehicle is tested with the DPPS undeployed. If HIT_d < TRT, the headform test must be dynamic. If HIT_d ≥ TRT, the test may be static or dynamic. Combined tests are also possible. The Appendix to Annex 7 gives a flowchart for the assessment.
New Annex 8: head impact time (HIT) determination simulation
Annex 8 gives the computer simulation that finds the HIT over the WAD for a vehicle with a DPPS. It uses Human Body Models qualified to Addendum 5 of M.R.1 and a vehicle speed of 40 km/h. The computed HIT values and the corresponding WADs go into Tables 3 and 4. From these results, graphs with a linear regression line are plotted.
Approval number and approval mark (paras. 4.2., 4.4.3., Annex 2)
Paragraph 4.2. now ends after its first sentence. The approval number no longer gets a slash and the letter "T", "E" or "F". Paragraph 4.4.3. on this extra character is deleted. The Annex 2 example now shows an approval to the 05 series of amendments.
Transitional provisions for WAD 2,100 and BRRL deleted (chapter 11)
Old paragraphs 11.16. to 11.23. are deleted. Paragraphs 11.0.1. and 11.0.2., under the new heading 11.0., apply to all series of amendments. Under new paragraph 11.27., Contracting Parties need not accept approvals to an earlier series first issued after 1 September 2031. Approvals with the atypical windscreen fracture procedures can be granted until 1 September 2033. Footnotes on the WAD 2,100 boundary and the BRRL are deleted. In Annex 1, Part 2, the line under the table of paragraph 16.1. is also deleted.
Q2Why it changed
- Proposed by
- Experts from Germany and the Kingdom of the Netherlands
- Working party
- GRSP, 79th session (June 2026)
Reasons
The 05 series transposes UN GTR No. 9, Amendment 3 into UN Regulation No. 127. This covers the DPPS test procedure and the HIT determination simulation.
Sources (2)
“It concerns the transposition of UN GTR No. 9, Amendment 3 (ECE/TRANS/WP.29/2024/77) on the test procedure for Deployable Pedestrian Protection Systems (DPPS) and the procedure for the head impact time (HIT) determination simulation into UN Regulation No. 127.”
“to transpose provisions for Deployable Pedestrian Protection Systems (DPPS) from UN GTR No. 9 into UN Regulation No. 127”
The 05 series gives test provisions for vehicles with a DPPS.
Source
“The intention of the 05 series of amendments is to provide test provisions for vehicles equipped with DPPS.”
The test procedures depend on the DPPS deployment status at the time of the head impact. For this reason, the head impact time (HIT) must be determined first.
Source
“Since those test procedures differ depending on the DPPS deployment status at the time of the head impact, for tests on vehicles equipped with DPPS, the determination of the pedestrian’s head impact time (HIT)”
The procedure must also make sure that the pedestrian is detected. It must also give safety when the DPPS does not deploy below the deployment threshold speed.
Source
“It is also necessary to ensure the pedestrian is properly detected as well as the safety of pedestrians in the cases where the DPPS is not deployed due to vehicle speeds below the deployment threshold during the accident.”
Document trail
- 2025-09ProposalECE/TRANS/WP.29/GRSP/2025/30Proposal by Germany and the Kingdom of the Netherlands
- —RevisedGRSP-78-45Changed proposal for the 78th GRSP session
- —RevisedGRSP-79-06Changed proposal for the 79th GRSP session
- —Working party adoptsECE/TRANS/WP.29/GRSP/79Session report, para. 23
- 2026-09Sent to WP.29ECE/TRANS/WP.29/2026/197Text that GRSP sent to WP.29 and AC.1
- PendingWP.29 voteScheduled for the 200th session (17–20 November 2026)
- PendingIn forceDate not yet known
Q3Who is affected
Vehicle manufacturer
- For a vehicle with a DPPS, give the system description and the deployment information that Annex 7, paragraph 1.2. lists.
- Document the HIT information according to Annex 8, including Tables 1 to 4.
- Take the chapter 2 measurements with the DPPS undeployed.
- Update the approval number format, because paragraph 4.2. no longer adds a letter after the number.
Component supplier
- Give the vehicle manufacturer the DPPS data that Annex 7, paragraph 1.2. lists, for example sensor type and sensor locations.
Technical service / Approval authority
- Test vehicles with a DPPS to Annex 7, including the sensing system verification with the FlexPLI and the headform tests.
- Use HIT_d and TRT to decide if the headform test is static or dynamic (Annex 7, paragraph 1.).
- Check the filled-in Tables 1 to 4 of the HIT determination simulations (Annex 8, paragraphs 3.2. to 3.4.).
- Check approvals that use the WAD 2,100 or BRRL provisions, because old paragraphs 11.19. to 11.23. are deleted.
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ⓘ This report gives advice only. It is not legal or type-approval advice.