(2) Where the height of a structure in a public place is indicated by means of a traffic sign, specified in regulations made under section 95(2) of the Road Traffic Act 1961, provided in accordance with those regulations on or in the vicinity of the structure, a person shall not drive or attempt to drive a mechanically propelled vehicle under the structure, where the height of the vehicle, including its load, if any, measured from the ground to its highest point is equal to or exceeds the height indicated in the traffic sign, so as to strike the structure.