Northern Territory Consolidated Regulations Northern Territory Consolidated Regulations(1) The capacity of the air storage tanks of a motor vehicle used in a B double or road train must be at least 12 times the volume of all the brake activation chambers on the motor vehicle.
(2) The capacity of the air storage tanks of a trailer used in a B-double or road train must be at least 8 times the volume of all the brake activation chambers on the trailer.
sets out requirements to ensure that motor vehicles do not emit too much smoke or noise and that exhaust gases cannot enter the passenger compartment of a vehicle.