No L 325/16 Official Journal of the European Communities 20.11. 78 COUNCIL DIRECTIVE of 17 October 1978 on the approximation of the laws of the Member States relating to the installation of light- ing and light-signalling devices on wheeled agricultural and forestry tractors (78/933/EEC) THE COUNCIL OF THE EUROPEAN COMMUNITIES, Having regard to the Treaty establishing the European Economic Community, and in particular Article 100 thereof, Having regard to the proposal from the Commission, Having regard to the opinion of the European Parlia- ment (1), Having regard to the opinion of the Economic and Social Committee (2), Whereas the technical requirements which tractors must satisfy pursuant to national laws relate inter alia to the installation of lighting and light-signalling devices; Whereas those 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 pro- cedure, which was 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-ap- .proval of wheeled agricultural or forestry tractors (3), to be applied in respect of each type of tractor; Whereas the common requirements for the construction, of lighting and light-signalling devices will be the sub- ject of further special Directives; Whereas the approximation of the laws of Member States relating to tractors entails mutual recognition by the Member States of the checks carried out by each of them on the basis of the common requirements; whereas, if the system is to function properly, these requirements must be applied by all Member States from the same date, HAS ADOPTED THIS DIRECTIVE: Article 1 1. ‘Agricultural or forestry tractor’ means any motor vehicle, fitted with wheels or endless tracks, having at (1) OJ No C S, 8. 1. 1975, p. 54. (2) O] No C 47, 27. 2. 1975, p. 43. (3) OJ No L 84, 28. 3. 1974, p. 10. least two axles, the main function of which lies in its “tractive power and which is specially designed to tow, push, carry or power certain tools, machinery or trailers intended for agricultural or forestry use. It may be equipped to carry a load and passengers. 2. This Directive shall apply only to the tractors de- fined in paragraph 1 which are fitted with pneumatic tyres and which have two axles and a maximum design speed of between 6 and 25 km/h. Article 2 -No Member State may refuse to grant EEC type-ap- proval or national type-approval of a tractor on grounds relating to the installation of lighting and light- signalling devices, whether mandatory or optional, listed in 1.5.7 to 1.5.21 of Annex I if these are installed in accordance with the requirements set out in that Annex. Article 3 No Member State may refuse the registration or pro- hibit the sale, entry into service or use of any tractor on grounds relating to the installation of lighting and light- signalling devices, whether mandatory or optional, listed in 1.5.7 to 1.5.21 of Annex I if they are installed in accordance with the requirements set out in that Annex. Article 4 A Member State which has granted EEC type-approval shall take the necessary measures to ensure that it is informed of any modification to any of the parts or characteristics referred to in 1.1 of Annex I. The com- petent authorities of that Member State shall determine whether further tests should be carried out on the modi- fied tractor type and a fresh report drawn up. Where such tests reveal failure to comply with the requirements of this Directive, the modification shall not be ap- proved. Article 5 Any amendments necessary to adjust the requirements of the Annexes to take account of technical progress