90.—(1) Save as provided in paragraph (2), no person shall use, or cause or permit to be used, on a road any trailer for the carriage of passengers for hire or reward.
(2) The provisions of paragraph (1) do not apply in respect of a wheeled trailer which is, or is carrying, a broken down motor vehicle if—
(a)the trailer is drawn at a speed not exceeding 30 mph; and
(b)where the trailer is, or is carrying, a broken down bus, it is attached to the drawing vehicle by a rigid draw bar.
(3) Save as provided in paragraph (4), no person shall use, or cause or permit to be used, on a road a wheeled trailer in which any person is carried and which is a living van having either—
(a)less than 4 wheels; or
(b)4 wheels consisting of two close-coupled wheels on each side.
(4) The provisions of paragraph (3) do not apply in respect of a trailer which is being tested by—
(a)its manufacturer;
(b)a person by whom it has been, or is being, repaired; or
(c)a distributor of, or dealer in, trailers.