770. Signalling in roads in regard to mines.

At mines1 of coal, stratified ironstone, shale or fireclay the signalling codes for use in roads2 in connection with various types of haulage and with conveyors are prescribed3, the use of signals other than those prescribed and any further signals which may be determined by the manager4 is prohibited5; signalling notices must be kept posted6; and, except in an emergency, no one other than an official of the mine or a person authorised by the manager may transmit any signal in a road7. At any such mine, except one at which not more than 30 persons are employed or