(42)It is important to grant Member States, national authorities and economic operators enough time to prepare for the application of the new rules introduced by this Regulation and the implementing and delegated acts adopted thereunder. The date of application should therefore be deferred, and different dates of application should be established for new and existing types. While for light-duty vehicles the date of application should be as soon as technically and economically possible, for heavy-duty vehicles and trailers the date of application can be delayed, since the transition to zero-emission vehicles will be longer for heavy-duty vehicles.