9. In the case of roadways where steel arches are used as the principal support–
(a)the maximum distance between adjacent arches shall be 1.2 metres; and
(b)the maximum distance between the last arch before the face and the face shall be 3.5 metres.
9. In the case of roadways where steel arches are used as the principal support–
(a)the maximum distance between adjacent arches shall be 1.2 metres; and
(b)the maximum distance between the last arch before the face and the face shall be 3.5 metres.