# 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 3.3: Atmospheric conditions

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

The wind conditions shall not interfere with wetting of the surface (wind-shields are allowed).
Both the wetted surface temperature and the ambient temperature shall be between 2 °C and 20 °C for snow tyres and 5 °C and 35 °C for normal tyres.
The wetted surface temperature shall not vary during the test by more than 10 °C.
The ambient temperature must remain close to the wetted surface temperature; the difference between the ambient and the wetted surface temperatures must be less than 10 °C.

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Source: https://www.legislation.gov.uk/eur/2009/1222/annex/V/division/3/division/3.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1222/annex-V/division-3/division-3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.