9. Any end marker or side marker which is required by any provision of this Schedule to be fitted to a projection of a load must be kept clean and unobscured.
10. Between sunset and sunrise, and at all times when visibility is seriously reduced, any end marker or side marker must be kept illuminated by a lamp which—
(a)makes the marker readily visible from a reasonable distance; and
(b)is shielded so that its light (except as reflected from the marker) is not visible to other persons using the road.