# Regulation (EC) No 1222/2009 of the European Parliament and of the Council of 25 November 2009 on the labelling of tyres with respect to fuel efficiency and other essential parameters (Text with EEA relevance), Division 2.1: Principle

Extent: E+W+S+N.I.

The measured Rolling Resistance Coefficient ( RRC m ) in a reference laboratory ( l ) shall be aligned to the assigned values of the network of reference laboratories.
The RRC m in a candidate laboratory ( c ) shall be aligned through one reference laboratory of the network of its choice.

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Source: https://www.legislation.gov.uk/eur/2009/1222/annex/IVa/division/2/division/2.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1222/annex-IVa/division-2/division-2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.