# 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 3.5.3.2: Warm-up phase

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

Drive the vehicle minimum 90 minutes at the target speed of the high speed test to warm-up the system. A repeated warm up (e.g. after a configuration change, an invalid test etc.) shall be at least as long as the standstill time. The warm-up phase can be used to perform the misalignment calibration test as specified in 3.6 of this Annex.
In case it is not possible to maintain high speed for a complete round, e.g. due to curves being too narrow, it is allowed to deviate from target speed requirement during the curves, including the nearby straight portions that are needed for slowing down and accelerating the vehicle.
Deviations shall be minimized as far as possible.
Alternatively, the warm-up phase may be performed on a nearby road, if the target speed is maintained within ± 10 km/h for 90 % of the warm-up time. The part of the warm-up phase used for driving from the road to the standstill area of the test track for zeroing of the torque meters shall be included in the other warm-up phase set out in point 3.5.3.4. The time for this part shall not exceed 20 minutes. The speed and time during the warm-up phase shall be recorded by the measurement equipment.

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/VIII/division/3/division/3.5/division/3.5.3/division/3.5.3.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-VIII/division-3/division-3.5/division-3.5.3/division-3.5.3.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.