ker se te zahteve v posameznih državah članicah razlikujejo in ker je zato potrebno, da vse države članice bodisi poleg svojih obstoječih predpisov ali namesto njih sprejmejo enake zahteve, zlasti zato, da bi bilo mogoče uvesti postopek EGS-homologacije na podlagi Direktive Sveta 74/150/EGS z dne 4. marca 1974 o približevanju zakonodaje držav članic o homologaciji kmetijskih in gozdarskih traktorjev na kolesih(4), spremenjene z Direktivo 79/694/EGS(5), za vsak tip traktorja,
Whereas these requirements differ from one Member State to another, whereas it is therefore necessary that all Member States adopt the same requirements, either in addition to or in place of their existing rules, in order in particular to allow the EEC type-approval procedure which forms the subject of Council Directive 74/150/EEC of 4 March 1974 on the approximation of the laws of the Member States relating to the type-approval of wheeled agricultural or forestry tractors (4), as amended by Directive 79/694/EEC (5), to be introduced in the case of each type of tractor,