Prevention of damage
14. No person shall—
(a)by any action wilfully damage or, except with permission given by, or on behalf of, the Secretary of State, mark any part of the relevant works;
(b)except with such permission, remove, or obscure any notices or signs placed on the relevant works in connection with the regulation of traffic, or with the levying of tolls; or
(c)drive on the specified roads any vehicle fitted with metal tyres or having deflated tyres.