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 ROLL-OVER PROTECTIVE STRUCTURES ( ROPS ) FOR CERTAIN CONSTRUCTION PLANT AND THE PROPOSAL FOR A COUNCIL DIRECTIVE ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES RELATING TO FALLING-OBJECT PROTECTIVE STRUCTURES ( FOPS ) FOR CERTAIN CONSTRUCTION PLANT