Where rope haulage apparatus or a conveyor is installed in a road in a mine or is so installed at a mine as to permit of its operation in a road therein, then, if the length of the part of that road through which vehicles can move as part of that apparatus or, as the case may be, through which loads can be carried by means of that conveyor, exceeds[F1 25 metres], there shall be provided and maintained effective means of transmitting signals from every point throughout that part of that road, to the place at which the apparatus or, as the case may be, the conveyor is operated.
F1SR 1991/239