Opinion of the Economic and Social Committee on the proposal for a Council Directive on the approximation of the laws of the Member States relating to headlamps which function as main beam and/or dipped beam headlamps and to incandescent electric filament lamps for such headlamps, to end-outline marker lamps, to front position ( side ) lamps, to rear position ( side ) and stop lamps, to direction indicator lamps, to reflex reflectors, to the rear registration plate lamps, to front fog lamps and filament lamps for such lamps, to rear fog lamps, to reversing lamps, to parking lamps, for wheeled agricultural or forestry tractors