(a) are in the same plane as the platforms for a minimum distance of—
(i) 3 metres if the length of the platforms is less than 18 metres; or
(ii) 1 metre if the length of the platforms is 18 metres or more;
(b) have a hard, true and durable surface of concrete or other approved material; and
(c) are arranged so that drainage from the surface does not flow into the pit.