# Commission Delegated Regulation (EU) 2015/68 of 15 October 2014 supplementing Regulation (EU) No 167/2013 of the European Parliament and of the Council with regard to vehicle braking requirements for the approval of agricultural and forestry vehicles (Text with EEA relevance), Division 5.2.2

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

The adhesion utilisation (ε) shall be measured on road surfaces with a coefficient of adhesion of 0,3 or less, and of about 0,8 (dry road), with an initial speed of 50 km/h or vmax, whichever is the lower. To eliminate the effects of differential brake temperatures it is recommended that zAL (see Appendix 1) be determined prior to the determination of k.
Until such test surfaces become generally available, tyres at the limit of wear, and higher values up to 0,4 may be used at the discretion of the technical service. The actual value obtained and the type of tyres and surface shall be recorded.

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Source: https://www.legislation.gov.uk/eur/2015/68/annex/XI/division/5/division/5.2/division/5.2.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2015-68/annex-XI/division-5/division-5.2/division-5.2.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.