Traffic control device means a flagger, sign, signal, marking, or other device used to regulate, warn or guide traffic, placed on, over, or adjacent to a street, highway, private road open to public travel, pedestrian facility, or shared-use path by authority of a public agency or official having jurisdiction, or, in the case of a private road open to public travel, by authority of the private owner or private official having jurisdiction.
aerodrome control service means air traffic control service for aerodrome traffic;
air traffic control service means a service provided for the purpose of:
Emission control system means the electronic engine management controller and any emission related component in the exhaust or evaporative system which supplies an input to or receives an output from this controller.
air traffic control unit means a generic term meaning variously, area control centre, approach control unit or aerodrome control tower;