Regulation 4
(1)
Save as provided in paragraph (2) below, the whole of every marking with which a builder's skip is required by these Regulations to be marked shall be—
(a)
clean and efficient, and
(b)
clearly visible for a reasonable distance to persons using the highway on which the skip is placed.
(2)
The requirement specified in paragraph (1)(b) above does not apply in respect of a marking, or part of a marking, on any door of a builder's skip whilst that door is required to be open for the purpose of loading or unloading the skip.