12.—(1) No part of any numbered work in Schedule 1 (authorised development) is to commence until wheel cleaning facilities have been installed to clean the wheels of all construction vehicles entering the public highway from the site of that numbered work, the design, specification and locations of which must first be approved in writing by the relevant planning authority.
(2) The approved facilities must remain in position and be maintained in full working order and be used by all heavy goods vehicles throughout the construction of the authorised development to minimise the risk that dust, mud or other deleterious matter is transferred to the public highway by vehicles leaving the authorised development.