29.8.77 Official Journal of the European Communities No L 220/1 (Acts whose publication is not obligatory) COUNCIL COUNCIL DIRECTIVE of 28 June 1977 on the approximation of the laws of the Member-States relating to the roll-over protection. structures of wheeled agricultural or forestry tractors (77/536/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 with which tractors must comply pursuant to national laws relate inter alia to roll-over protection structures and to their attach- ment to the tractor; : 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 procedure 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-approval of (% OJ No C 76, 7. 4. 1975, p. 37. (3 OF No C 263, 17. 11. 1975, p. 58. wheeled agricultural or forestry tractors (%), to be ap- plied in respect of each type of tractor; Whereas a harmonized component type-approval pro- cedure for roll-over protection structures and their at- tachment to the tractor makes it possible for each Member State to check compliance with -the common construction and testing requirements and to inform the other Member States of its findings by sending a copy of - the component type-approval certificate completed for reach type of roll-over protection structure and its at- ‘tachment to the tractor; whereas the placing of an EEC- component type-approval mark on all structures manu- a factured in conformity with the approved type obviates any need for technical checks on those structures in the other Member States; Whereas common .requirements concerning other ele- “ments and characteristics of the roll-over protection strucgure, in particular those concerning the dimensions, doors, safety glass, devices to prevent continuous rolling if the tractor overturns, and protection of passengers, " will be laid down at a later date; Whereas “the harmonized requirements are intended principally to ensure safety on the road and at work throughout the Community; whereas for this reason it is' necessary to introduce the obligation for tractors () OJ No L 84, 28. 3. 1974, p. 10.