# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 6.4.1: Wind tunnel criteria


The wind tunnel design, test methods and the corrections shall provide a value of (CD × Af) representative of the on-road (CD × Af) value and with a precision of ± 0,015 m2.
For all (CD × Af) measurements, the wind tunnel criteria listed in paragraph 3.2. of this Sub-Annex shall be met with the following modifications:
(a)The solid blockage ratio described in paragraph 3.2.4. of this Sub-Annex shall be less than 25 per cent;
(b)The belt surface contacting any tyre shall exceed the length of that tyre's contact area by at least 20 per cent and shall be at least as wide as that contact patch;
(c)The standard deviation of total air pressure at the nozzle outlet described in paragraph 3.2.8. of this Sub-Annex shall be less than 1 per cent;
(d)The restraint system blockage ratio described in paragraph 3.2.10. of this Sub-Annex shall be less than 3 per cent.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/6./division/6.4./division/6.4.1. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-6./division-6.4./division-6.4.1.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.