GAR | Brake Assist Systems

Saturday, 16 August 2025
Week 33

Cookies help us deliver our services. By using our services, you agree to our use of cookies. Learn more

Latest Documents

14 Aug 2025 | SLR: Follow-up to the 73rd IWG session (for information only) | SLR-...

14 Aug 2025 | UK Health and Safety Executive accident data for trailer reversing c...

14 Aug 2025 | UN R138: Draft amendment on AVAS sound levels | R51/R138-13-06/Rev.1

13 Aug 2025 | UN R159: Working draft amendments for separate technical units | TF-...

12 Aug 2025 | Report of the 16th (June 2025) SCUNV informal group session | SCUNV-16

12 Aug 2025 | Safer and Cleaner Vehicles: Agenda for the 17th (August 2025) sessio...

12 Aug 2025 | Report of the 17th (July 2025) TF-STU task force session | TF-STU-17-02

12 Aug 2025 | VRU Separate Technical Units: Agenda for the 17th (July 2025) sessio...

(19 posted during the past week)

SLR: Follow-up to the 73rd IWG session (for information only)

Reference Number:	SLR-73-00
Meeting Session(s):	73rd SLR session (9-11 Jul)
Document date:	14 Aug 25
Regarding:	UN R48 Installation of Lighting \| UN R53 Motorcycle Lighting \| UN R74 Moped Lighting \| UN R86 Tractor Lighting \| UN R148 Light-Signalling Devices \| UN R149 Road Illumination Devices (RID) \| UN R150 Retro-reflective Devices (RRD) \| SLR

Download from UNECE:

.pdf format

UK Health and Safety Executive accident data for trailer reversing collisions with VRUs

Reference Number:	TF-R151/158-04-02/Rev.1
Submitted by:	DfT
Meeting Session(s):	4th TF-R151/158 session (30 Jun)
Document date:	14 Aug 25
Regarding:	UN R158 Reversing Motion

Download from UNECE:

.ppt format

UN R138: Draft amendment on AVAS sound levels

Reference Number:	R51/R138-13-06/Rev.1
Meeting Session(s):	13th R51/R138 session (6 Aug)
Document date:	14 Aug 25
Regarding:	UN R138 Quiet Road Transport Vehicles

Download from UNECE:

.docx format

UN R159: Working draft amendments for separate technical units

Reference Number:	TF-STU-17-04
Meeting Session(s):	17th TF-STU session (2 Jul)
Document date:	02 Jul 25
Regarding:	UN R159 MOIS

Download from UNECE:

.pdf format

.docx format

Report of the 16th (June 2025) SCUNV informal group session

Reference Number:	SCUNV-16
Meeting Session(s):	17th SCUNV session (19 Aug)
Document date:	12 Aug 25
Regarding:	Safe and Clean Vehicles

Download from UNECE:

.docx format

Safer and Cleaner Vehicles: Agenda for the 17th (August 2025) session

Reference Number:	SCUNV-17-01
Meeting Session(s):	17th SCUNV session (19 Aug)
Document date:	12 Aug 25
Regarding:	Safe and Clean Vehicles

Download from UNECE:

.docx format

Report of the 17th (July 2025) TF-STU task force session

Reference Number:	TF-STU-17-02
Meeting Session(s):	17th TF-STU session (2 Jul)
Document date:	12 Aug 25
Regarding:	UN R151 Blind spot detection \| UN R158 Reversing Motion \| UN R159 MOIS \| VRU Proximity Awareness

Download from UNECE:

.pdf format

VRU Separate Technical Units: Agenda for the 17th (July 2025) session

Reference Number:	TF-STU-17-01
Meeting Session(s):	17th TF-STU session (2 Jul)
Document date:	02 Jul 25
Regarding:	UN R151 Blind spot detection \| UN R158 Reversing Motion \| UN R159 MOIS \| VRU Proximity Awareness

Download from UNECE:

.pdf format

Upcoming Meetings

Safer and Cleaner Used and New Vehicles in Developing Markets | Session ...

GRSP Task Force on Automated Vehicles and Regulation Screening | Session...

GRBP Task Force on Automated Vehicle Regulation Screening | Session 17 |...

Informal Working Group on Children Left in Vehicles | Session 11 | 26-28...

Informal Working Group on Artificial Intelligence | Session 1 | 27 Aug

Working Party on Noise and Tyres | Session 82 | 3-5 Sep

Electric Vehicles and the Environment | Session 87 | 4 Sep

Working Party on Automated and Connected Vehicles | GRVA Scenarios Works...

Electric Vehicle Safety | Session 30 | 9-11 Sep

Simplification of Lighting and Light-Signalling Regulations | Session 74...

Informal Working Group on Automated Driving Systems | Session 13 | 10-11...

Automotive Life Cycle Assessment | Session 26 | 10 Sep

View complete calendar

Latest Changes to Regulations

10 Jul 2025 UN R13-H Revision 4 | Amendment 6 (Light Vehicle Braking)

Regulation:	UN Regulation No. 13-H \| Light-Duty Vehicle Braking
Document:	Revision 4 \| Amendment 6
Corresponds to:	02 series of amendments (Entered into force on 12 Jun 2025)
Based on:	Document WP.29/2024/147 Proposal to align UN R13-H 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. Document WP.29-194-08

7 Jul 2025 UN R172 Corrigendum 1 (Traction/snow retreaded tyres)

Regulation:	UN Regulation No. 172 \| Retreaded tyres: Snow performance and/or traction classification
Document:	Corrigendum 1

13 Mar 2025 UN R172 UN R172 (Traction/snow retreaded tyres)

Regulation:	UN Regulation No. 172 \| Retreaded tyres: Snow performance and/or traction classification
Document:	UN R172
Corresponds to:	Original text (Entered into force on 10 Jan 2025)
Based on:	Document WP.29/2024/75

12 Mar 2025 UN R138 Revision 1 | Amendment 4 (Quiet Road Transport Vehicles)

Regulation:	UN Regulation No. 138 \| Quiet Road Transport Vehicles
Document:	Revision 1 \| Amendment 4
Corresponds to:	02 series of amendments (Entered into force on 10 Jan 2025)
Based on:	Document WP.29/2024/66 Proposal to specify the working principles of an Acoustic Vehicle Alerting System (AVAS) and to reduce measurement uncertainties during the measurement of the one third octave bands.

27 Jan 2025 UN R13-H Revision 4 | Amendment 5 (Light Vehicle Braking)

Regulation:	UN Regulation No. 13-H \| Light-Duty Vehicle Braking
Document:	Revision 4 \| Amendment 5
Corresponds to:	01 series of amendments \| Supplement 5 (Entered into force on 10 Jan 2025)
Based on:	Document WP.29/2024/59 Proposal to adapt the regulation to allow for the approval of vehicles equipped with both an Automated Driving System and a manual driving mode.

9 Jan 2025 UN R167 Amendment 1 (CV Direct Vision)

Regulation:	UN Regulation No. 167 \| UN Regulation on Commercial Vehicle Direct Vision
Document:	Amendment 1
Corresponds to:	Original text \| Supplement 1 (Entered into force on 22 Sep 2024)
Based on:	Document WP.29/2024/13 Proposal to introduce an alternative method for assessment of the frontal visible volume to address future cab designs with narrower distances between A pillars. The current measurement method is dependent on the position of the A pillar. The alternative method is independent of the cab design and would be available for use at the manufacturer’s discretion.

16 Dec 2024 UN R148 Revision 1 | Amendment 2 (Light-Signalling Devices)

Regulation:	UN Regulation No. 148 \| Light-Signalling Devices (LSD)
Document:	Revision 1 \| Amendment 2
Corresponds to:	01 series of amendments \| Supplement 2 (Entered into force on 22 Sep 2024)
Based on:	Document WP.29/2024/23 Proposal to clarify and correct the text and improve the definition of photometric stability.

View last six months

Recent Headlines

6 May 2025 CO2 emissions EP fast-tracks vote on flexibility measures for...

10 Mar 2025 Electric vehicles and climatisation measuring the impact on...

29 Jan 2025 EU Parliament report on vehicle circularity and end-of-life...

9 Jan 2025 High-visibility clothing may thwart pedestrian crash prevention...

30 Dec 2024 Australia ceases UN R147 application

20 Dec 2024 NHTSA Proposes National Program for Vehicles with Automated...

Vehicle System Pages

Lighting and Light-Signalling

Passive Safety

Driving Automation

Emissions and Energy

Vehicle and Tyre Noise

Braking and Steering

Tyres

General Construction Safety

Vehicle Categories Pages

Definitions

Motorcycles

Passenger Vehicles

Commercial Vehicles

Agricultural Vehicles

Trailers

Home

Reference Number:	WP.29/2019/48
Meeting Session(s):	178th WP.29 session (24-28 Jun 2019)
Document date:	11 Apr 19
Document status:	Adopted by WP.29
Regarding:	UN R139 Brake Assist Systems
Adoption Vote
This proposal (WP.29/2019/48) was adopted by the World Forum. Forty Contracting Parties out of the 55 applying UN R139 were present for the vote by AC.1. Forty voted in favor with zero against and zero abstaining.
View full document file for more information

Reference Number:	GRVA-02-29
Meeting Session(s):	2nd GRVA session (28 Jan-1 Feb 2019)
Document date:	29 Jan 19
Document status:	Superseded
Regarding:	UN R139 Brake Assist Systems
View full document file for more information


11 Nov 2019	Correlations between some UN Regulations and UN Rules	PTI-16-02	2019-11-11
19 Apr 2019	UN R139: Proposal for Supplement 2	WP.29/2019/48	2019-04-19
29 Jan 2019	UN R139: Agreed amendments to GRVA/2019/12	GRVA-02-29	2019-01-29