# 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 4: PROCEDURE FOR THE ALIGNMENT OF A REFERENCE LABORATORY TO THE ASSIGNED VALUES

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

Each reference laboratory ( l ) shall align itself to the assigned values of the alignment tyre set using a linear regression technique, A1 l and B1 l , calculated as follows:
RRC = A1 l * RRC m,l + B1 l
where:
RRC is the assigned value of the rolling resistance coefficient;
RRC m, is the measured value of the rolling resistance coefficient by the reference laboratory ‘ l ’ (including temperature and drum diameter corrections)

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Source: https://www.legislation.gov.uk/eur/2009/1222/annex/IVa/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1222/annex-IVa/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.