# Commission Regulation (EU) No 109/2011 of 27 January 2011 implementing Regulation (EC) No 661/2009 of the European Parliament and of the Council as regards type-approval requirements for certain categories of motor vehicles and their trailers as regards spray suppression systems (Text with EEA relevance), Division 6.3.1

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

The width of the flap must fulfil the requirement for ‘q’ in point 6.1.1(c), except for any part of the flap that is contained within the mudguards. In such cases this part of the flap must be at least equal in width to the tread of the tyre.
The width of the part of the rain flaps positioned beneath the mudguard must satisfy the condition laid down in this paragraph with a tolerance of ± 10 mm at each side.

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Source: https://www.legislation.gov.uk/eur/2011/109/annex/IV/division/3/division/6/division/6.3/division/6.3.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-109/annex-IV/division-3/division-6/division-6.3/division-6.3.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.