Paragraph 11

Without prejudice to the provisions of the Coal and Other Mines (Ventilation) Regulations, 1956^f1, where a locomotive runs in any length of road in which the use of lamps or lights, other than permitted lights, is unlawful, the manager shall make and secure the efficient carrying out of arrangements whereby determinations of the percentage of inflammable gas present in the general body of the air (in these regulations referred to as “the firedamp content”) are made in that length of road in accordance with the provisions of the three next following regulations: Provided that an inspector, if he is satisfied that the normal firedamp content in any length of road is not such as to make regular determinations necessary, may by notice served on the manager exempt that length from the application of any provision in this Part of these regulations.