WP.29 196th session: amendments to UN Regulations
24–27 June 2025
Amendments to UN Regulations that the WP.29 documents submitted for the vote at the 196th session. Each change report shows what changes, why, and who is affected.
This list has the 37 amendments with a RegVault change report, in 26 regulations. It is not the full agenda of the session.
UN R9 — Noise of three-wheeled vehicles
- 08 series — Supplement 3
The surface of the test track in Annex 3 must now conform to ISO 10844:2021 instead of ISO 10844:2014.
UN R13 — Heavy vehicle braking
- 15 series — Supplement 1
For full trailers and centre-axle trailers, paragraphs 5.1.3. and 5.2.1. of Annex 10 now refer to a new diagram 5, not to diagram 2.
- 14 series — Supplement 2
This supplement adds a new Diagram 5 for full trailers and centre-axle trailers to Annex 10.
- 13 series — Supplement 5
For full and centre-axle trailers with compressed-air braking, Annex 10 paras 5.1.3. and 5.2.1. now refer to a new diagram 5, not diagram 2.
- 12 series — Supplement 7
For full and centre-axle trailers with compressed-air braking, Annex 10 paras 5.1.3. and 5.2.1. now refer to a new diagram 5, not diagram 2.
UN R16 — Safety-belts
- 10 series — Supplement 1
The buckle-opening test load in paragraph 7.8.2. is now 30 daN on each of the two straps of a two-point lap belt. For a three-point belt, it is 30 daN on the two clamped straps of the diagonal belt part together.
UN R17 — Strength of seats, their anchorages and head restraints
- 12 series — Base text
New paragraph 5.6.8. applies to vehicles of M1 and N1. In a defined position, a 120 +1/-0 mm cylinder must not pass from front to rear through the head restraint structure. In this position, the head restraint is in its lowest position of use and the seat back in its design torso angle.
UN R30 — Tyres for passenger cars and their trailers
- 02 series — Supplement 27
On run flat or self-supporting tyres suitable for speeds above 240 km/h but not above 300 km/h, “ZRF” may replace “RF”. Above 300 km/h, “ZRF” must replace “RF”.
UN R41 — Noise emissions of motorcycles
- 06 series — Base text
For nPP' ≥ nwot,(i), the RD-ASEP limit of Annex 7 is now the lower of the old line and a new logarithmic line.
- 05 series — Supplement 4
The rule in paragraph 6.3.1. against a device or procedure used to pass the noise tests now also names software.
- 04 series — Supplement 12
The rule in paragraph 6.3.1. against a device or procedure used to pass the noise tests now also names software.
UN R44 — Child Restraint Systems
- 04 series — Supplement 19
From 1 September 2026, Contracting Parties applying R44 need not accept its approvals of vehicle specific “built-in” child restraint systems first issued after that date.
UN R54 — Tyres for commercial vehicles and their trailers
- 00 series — Supplement 28
Under paragraph 2.21., the nominal rim diameter is expressed either by codes (numbers below 100) or in millimetres (numbers above 100) but not both.
UN R61 — External projections of commercial vehicles
- 00 series — Supplement 4
Annex 3 no longer contains the procedure for the “H” point and the actual seat-back angle. A new footnote refers to Addendum 6 of M.R.1.
UN R75 — Tyres for L-category vehicles
- 00 series — Supplement 21
The category of use “special tyre” is now “special-use tyre”, and new paragraph 2.33.1. defines “Normal tyre” as a tyre intended for normal, on-road use.
UN R79 — Steering equipment
- 04 series — Supplement 8
New paragraph 5.3.3.6. gives an alternative to the 24 “figure of eight” manoeuvres of paragraph 5.3.3.3. for a shared energy source or electrical supply.
- 03 series — Supplement 13
New paragraph 5.3.3.6. gives an alternative to the 24 “figure of eight” manoeuvres of paragraph 5.3.3.3. for a shared energy source or electrical supply.
UN R108 — Retreaded tyres for passenger cars and their trailers
- 01 series — Supplement 1
Principal grooves (paragraph 2.14.1.) are now the wide tread grooves positioned in the central zone of the tyre tread, and new paragraph 2.15. defines “Tread depth”.
UN R109 — Retreaded tyres for commercial vehicles and their trailers
- 01 series — Supplement 1
Paragraph 2.56. now defines the central zone for “Principal grooves” as “the area on the tread which comprises of 75 per cent of the width of the tread measured symmetrically from the centre line”.
UN R117 — Tyres rolling resistance, rolling noise and wet grip
- 04 series — Supplement 3
In Annex 9, the reference tyre BFCave,corr must now be “greater than or equal to 0.42 and less than or equal to 0.64”, and µpeak,corr “greater than or equal to 0.50 and less than or equal to 0.75”. Until 6 July 2026, Contracting Parties may continue to grant class C1 approvals with Annex 9 tests and Supplement 2 surface friction (paragraph 12.27.). New Annex 9 paragraph 2.3.1.6. covers water depth measurement for external watering.
- 02 series — Supplement 17
Paragraph 2.16.1. now defines “principal grooves” as the wide tread grooves positioned in the central zone of the tyre tread. The central zone is “the area on the tread which comprises of 75 per cent of the width of the tread measured symmetrically from the centre line”. New paragraph 2.16.2. defines “tread groove”.
UN R129 — Enhanced Child Restraint Systems (ECRS)
- 04 series — Supplement 3
Paragraph 3.5 now says “more than one UN Regulation No. 129 approval number” where it said “more than one approval number”.
- 03 series — Supplement 12
Paragraph 3.5. now says “more than one UN Regulation No. 129 approval number” where it said “more than one approval number”.
UN R131 — Advanced emergency braking systems (AEBS)
- 02 series — Supplement 2
Paragraph 5.4.1.1. now requires the AEBS function to be automatically reinstated “at each initiation of the powertrain”, instead of “at the initiation of each new engine start (or run cycle, as relevant)”.
- 01 series — Supplement 4
Paragraph 5.4.1. now requires the AEBS function to be automatically reinstated “at each initiation of the powertrain”, instead of “at the initiation of each new engine start (or run cycle, as relevant)”.
UN R134 — Hydrogen and Fuel Cell Vehicles (HFCV)
- 02 series — Supplement 2
One (1) container is now tested in paragraph 5.2. Before, three (3) containers were tested in some cases, depending on the pressure cycle life measurements made in paragraph 5.1.2.
UN R142 — Tyre installation
- 01 series — Supplement 2
New paragraph 5.2.1.5. says Free Rolling Tyres marked “FRT” must not be fitted to front axles and drive axles of M or N motor vehicles.
UN R152 — Advanced Emergency Braking System (AEBS)
- 02 series — Supplement 5
Paragraph 5.4.1.1. now requires the AEBS function to be automatically reinstated “at each initiation of the powertrain”, instead of “at the initiation of each new engine start (or run cycle, as relevant)”.
UN R157 — Automated Lane Keeping Systems (ALKS)
- 01 series — Supplement 4
For Categories N3 or M3, a regular lane change may start only if the target lane's permitted maximum speed is limited for all vehicle categories.
- 00 series — Supplement 6
Paragraphs 5.5.5. and 6.2.2. now use “initiation of the powertrain” instead of “engine start/run cycle”.
UN R170 — Child Restraint Systems for Safer Transport of Children in Buses
- 00 series — Supplement 1
The Introduction now names CRS approved according to UN Regulation No. 129 or UN Regulation No. 44. The requirements of this UN Regulation do not apply to these CRS.
UN R171 — Driver Control Assistance System (DCAS)
- 00 series — Supplement 2
A DCA must clearly and prominently instruct the driver to immediately resume at least the lateral control of the vehicle.
UN R172 — Snow grip performance and traction tyre classification for retreaded tyres
- 00 series — Supplement 1
As from 1 September 2030, Contracting Parties must not grant type approvals based on “snow performance tests as described in Annex 7 to UN Regulation No. 117” using SRTT19.5 or SRTT22.5 as reference tyre. The table in paragraph 6.1. now also lists SRTT19.5 siped and SRTT22.5 siped.
UN R173 — Installation of safety-belts, restraint systems, child restraint systems, ISOFIX child restraint systems and i-Size child restraint systems
- 01 series — Base text
New paragraphs 5.2.3. to 5.2.3.2. add a strap length requirement for rear seating positions of M1 category vehicles, with conditions where it does not apply.
- 00 series — Supplement 1
Annex 6, Appendix 2, paragraph 3.4. now refers to “Table 1 of Appendix 3 of this annex” instead of “Table 2 and/or 3 of Appendix 3 of this annex”.
UN R174 — Safety-belt reminders
- 01 series — Base text
If the vehicle master control switch was activated remotely, the first level warning must be (re-)initiated once the driver enters or driver presence is detected.
UN R175 — Acceleration control for pedal error (ACPE)
- 01 series — Base text
Paragraph 1.1. now applies the Regulation to vehicles of Category M1 and N1 equipped with automatic transmission.