12(1)The nominated undertaker shall not, except with the consent of the highway authority, deposit any soil or materials, or stand any plant, on or over any highway so as to obstruct or render less safe the use of the highway by any person, or, except with the like consent, deposit any soil or materials on any highway outside a hoarding, but if within 28 days after request for it any such consent is neither given nor refused it shall be deemed to have been given.
(2)The expense reasonably incurred by the highway authority in removing any soil or materials deposited on any highway in contravention of this paragraph shall be repaid to the highway authority by the nominated undertaker.