(1) This section applies to a bus that--
(a) is descending a no standing passenger road; and
(b) is carrying school students on a general route service, or school service, on a journey that is, or is part of, a journey to or from a school; and
(c) is being used to provide a general route service or school service under a service contract, TransLink service contract or prescribed school service contract.
(2) If the bus is--
(a) a light bus built to carry more than 16 passengers, whether seated or standing, as well as the driver and crew; and
(b) being used to provide a school service;
the driver of the bus must activate the exhaust brake fitted to the bus.
(3) If the bus is a heavy bus, the driver of the bus must use the power-train retarder fitted to the bus under schedule 1, section 29(1)(c).