8.7.8. Any travelway in an underground work site shall be provided with shelter spaces:(a) if the travelway does not have, when a piece of equipment travels on tracks or by any other guided system, a minimum free space of 500 mm between the widest part of the machinery and the wall of each side of the equipment, or a free space of 600 mm on one side of the equipment;
(b) if the width of the travelway does not exceed the width of the equipment not travelling on tracks by at least 1.5 m.