# Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance), Division 3.4.2: Vehicle speed

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

The vehicle speed is determined by the air drag pre-processing tool based on the CAN-bus front axle signal which is calibrated based on either:
Option (a) a reference speed calculated by a delta-time from two fixed opto-electronic barriers (see 3.4.4 of this Annex) and the known length(s) of the measurement section(s) or
Option (b) a delta-time determined speed signal from the position signal of a DGPS and the known length(s) of the measurement section(s), derived by the DGPS coordinates
For the vehicle speed calibration the data recorded during the high speed test are used.

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/VIII/division/3/division/3.4/division/3.4.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-VIII/division-3/division-3.4/division-3.4.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.