In sections 36 to 39 of this Act—

• “authorised” means specially authorised by the Secretary of State;

• “motor vehicle” has the same meaning as in the M1Road Traffic regulation Act 1984;

• “road hump” means an artificial hump which is in, or on the surface of, a road and which is designed to control the speed of vehicles; and references to a road hump include references to any other works (including signs or lighting) required in connection with such a hump; and

• “statutory”, in relation to a speed limit, means having effect by virtue of an enactment.