Home/Resources/Regulation Library/R-171
ECE R-171
Driver Control Assistance Systems (DCAS)
Applies to
M, N
Topic
ADAS & vision
Framework
UN ECE
Velocert services
European
Overview
UN Regulation No 171 lays down uniform provisions for the approval of vehicles with regard to Driver Control Assistance Systems (DCAS). Its annexes cover special requirements for the audit and assessment, physical test specifications for validation, and the credibility assessment of virtual toolchains.
Current series: 01 series, Supplement 1 (in force 4 June 2026); this summary is based on the version published on EUR-Lex, 01 series (2025). GlobalAutoRegs also lists Supplements 2 and 3 to the 01 series and the 02 series with no entry-into-force date. Checked on GlobalAutoRegs, 1 November 2026. For the current text, see the UN (UNECE) page.
Scope
It applies to the type-approval of vehicles of categories M and N with regard to DCAS. It does not apply to ACSF or RMF functions approved under UN Regulation No 79, unless the manufacturer declares them to be part of DCAS.
The regulation applies to the following vehicle categories:
M
Passenger vehicles
N
Goods vehicles
Official source
For the requirements of this regulation, refer to the official text in force and its amendments.
Official UNECE text