Article 3a 5.

Heavy-duty vehicles other than those referred to in paragraph 4 that are registered for use by civil protection services, fire services, forces responsible for maintaining the public order or urgent medical care services shall not be subject to the CO2 emissions reduction targets set out in paragraphs 1 to 3, provided that a Member State so indicates in the registration and reporting process, thereby confirming in the data reported in accordance with Part A of Annex IV that the purpose of the heavy-duty vehicle cannot be equally served by a zero-emission heavy-duty vehicle and it is therefore in the public interest to register a heavy-duty vehicle with a combustion engine to fulfil that purpose.