Northern Territory Consolidated Regulations Northern Territory Consolidated Regulations(1) While an omnibus is being used as a school bus, it shall carry, prominently displayed at the front and at the rear of the bus, a rectangular sign not less than 1,500 millimetres long and not less than 250 millimetres wide, carrying the words "SCHOOL BUS" on a yellow background in bold-faced black letters not less than 200 millimetres high.
(2) A sign displayed in pursuance of subregulation (1) shall be clearly legible in normal conditions from a distance of 30 metres.
(3) The driver of an omnibus shall ensure that a sign in accordance with this regulation:
(a) is displayed at all times while the bus is being used as a school bus; and
(b) is not displayed except while the bus is being so used.
(4) For the purposes of this regulation, an omnibus is being used as a school bus while it is engaged principally in carrying children to or from school and the route that it is taking begins or ends at a school.