(1) For the purposes of section forty of the Act the intervals, which must not be exceeded, between refuge holes in roads in which vehicles run shall be—
(a) in the case of a length of road in which the gradient does not exceed 1:20 and in which the maximum speed of the vehicles must not exceed four miles per hour, three hundred feet;
(b) in any other case, sixty feet.
(2) For the said purposes the prescribed dimensions of refuge holes are—
(a) in width, three feet as nearly as may be;
(b) in depth, not less than three feet; and
(c) in height, not less than the height of the road at that place or six feet, whichever is the less.
(3) Where in any length of road there is a continuous clear space not less than two feet in width between vehicles running therein and one side of the road, every refuge hole therein shall be on that side of the road.
(4) Where in any length of road such clear space is not provided, any refuge holes in a part of the road which curves shall be on the outside of the curve and, so far as is consistent with that requirement, all the refuge holes therein shall be on the same side of the road.
(5) The manager of a mine may permit vehicles to run in a length of road, notwithstanding that refuge holes are not provided therein in accordance with the provisions of section forty of the Act and the preceding paragraphs of this regulation, if as regards that length of road—
(a) the aggregate weight of mineral carried therein in any hour does not exceed ten tons; or
(b) there is a continuous clear space not less than two feet in width between the vehicles and one side of the road.