Article 4
1. Member States shall not allow the normal circulation of vehicles or vehicle combinations for the national transport of goods in their territory which are not in conformity with the characteristics set out in points 1.1, 1.2, 1.4 to 1.8, 4.2 and 4.4 of Annex I. 2. Member States may nonetheless allow circulation in their territory of vehicles or vehicle combinations for the national transport of goods freight which are not in conformity with the characteristics set out in 1.3, 2, 3, 4.1 and 4.3 of Annex I. 3. Vehicles or vehicle combinations which exceed the maximum dimensions may only be allowed to circulate on the basis of special permits issued without discrimination by the competent authorities, or on the basis of similar non-discriminatory arrangements agreed on a case-by-case basis with those authorities, where these vehicles or vehicle combinations carry or are intended to carry indivisible loads. 4. Member States may allow vehicles or vehicle combinations used for goods transport which carry out certain national transport operations that do not significantly affect international competition in the transport sector to circulate in their territory with dimensions deviating from those laid down in points 1.1, 1.2, 1.4 to 1.8, 4.2 and 4.4 of Annex I. Transport operations shall be considered not significantly to affect international competition in the transport sector if one of the conditions under (a) and (b) is fulfilled: (a) the transport operations are carried out in a Member State's territory by specialized vehicles or specialized vehicle combinations in circumstances in which they are not normally carried out by vehicles from other Member States, e.g. operations linked to logging and the forestry industry; (b) the Member State which permits transport operations to be carried out in its territory by vehicles or vehicle combinations with dimensions deviating from those laid down in Annex I also permits motor vehicles, trailers and semi-trailers which comply with the dimensions laid down in Annex I to be used in such combinations as to achieve at least the loading length authorized in that Member State, so that every operator may benefit from equal conditions of competition (modular concept). The Member State concerned which has to adapt its road infrastructure in order to be able to fulfil the condition under (b) may nevertheless prohibit, until 31 December 2003 at the latest, the circulation in its territory, in national goods transport operations, of vehicles or vehicle combinations which exceed current national standards on dimensions, provided that national legislation continues to apply to all Community carriers in a non-discriminatory manner. The Member States shall inform the Commission of the measures taken pursuant to this paragraph. 5. Member States may allow vehicles or vehicle combinations incorporating new technologies or new concepts which cannot comply with one or more requirements of this Directive to carry out certain local transport operations for a trial period. Member States shall inform the Commission thereof. 6. Member States may allow vehicles or vehicle combinations used for goods transport and registered or put into circulation before the implementation of this Directive to circulate in their territory until 31 December 2006 with dimensions exceeding those laid down in points 1.1, 1.2, 1.4 to 1.8, 4.2 and 4.4 of Annex I by virtue of differing national provisions or methods of measurement.