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ECE R-173
Installation of Safety-Belts, Restraint Systems and Child Restraint Systems
Applies to
M, N, O, L
Topic
Occupant safety
Framework
UN ECE
Velocert services
European
Overview
UN Regulation No 173 lays down uniform provisions for the approval of the installation of safety-belts, restraint systems, child restraint systems, ISOFIX child restraint systems and i-Size child restraint systems.
Current series: 01 series, Supplement 1 (in force 4 June 2026); this summary is based on the UN text kept on GlobalAutoRegs, the original version (2025). The text was not found on EUR-Lex. GlobalAutoRegs also lists Supplement 2 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 vehicles of categories M, N, O, L2, L4, L5, L6, L7 and T1 with regard to installing safety-belts and restraint systems used by adults in forward-facing, rearward-facing and side-facing seats, and to vehicles of categories M1 and N1 with regard to installing child restraint systems and ISOFIX child restraint systems. At the manufacturer's request it also applies to M2 and M3 vehicles and to installing i-Size child restraint systems.
The regulation applies to the following vehicle categories:
M
Passenger vehicles
N
Goods vehicles
O
Trailers and semi-trailers
L
Two- and three-wheelers, quadricycles
Official source
For the requirements of this regulation, refer to the official text in force and its amendments.
Official UNECE text