12. After paragraph 13 insert—
13A.—(1) A road surfacing vehicle is an excepted vehicle.
(2) In sub-paragraph (1) above “road surfacing vehicle” means a vehicle which —
(a)is designed and constructed to perform an operation necessary to construct or restore the surface of a road,
(b)does not carry any load on a public road except such as is necessary for its propulsion or for the operation of any machinery built-in or permanently attached to the vehicle, and
(c)has a maximum speed not exceeding 20 kilometres per hour.
13B.—(1) A tar sprayer is an excepted vehicle.
(2) In sub-paragraph (1) above a tar sprayer means a vehicle which is constructed or permanently adapted, and used, solely for spraying tar on to the road or for proceeding to and from the place where it is to be or has been used for that purpose.”.