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ECE R-66
Superstructure Strength
Applies to
M
Topic
Structure & dimensions
Framework
UN ECE
Velocert services
European · Series · Individual
Overview
UN Regulation No 66 lays down uniform provisions for the approval of large passenger vehicles with regard to the strength of their superstructure. Its annexes cover the rollover test as the basic approval method and equivalent methods using body sections.
This summary is based on the version published on EUR-Lex, 02 series (2010), which is the current series. GlobalAutoRegs also lists Supplement 1 to the 02 series and the 03 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 single-deck rigid or articulated vehicles of categories M2 or M3, Classes II or III or class B, having more than 16 passengers. At the manufacturer's request it may also apply to other M2 or M3 vehicles.
The regulation applies to the following vehicle categories:
M
Passenger vehicles
Official source
For the requirements of this regulation, refer to the official text in force and its amendments.
Official UNECE text