Division 2.1.4.2

The engine, if fitted, shall run at a speed not exceeding 30 % of the speed corresponding to its maximum power output. However, if this is proven not to be practicable due to specific engine control strategies, for instance in the case of electric hybrid vehicles, a realistic scenario taking into account the engine speeds, periodical absence or complete absence of a running engine during normal driving conditions, shall be determined. If the windscreen wiper system can meet the requirements without a running engine, the engine does not have to run at all.