The development of Intelligent Transport Systems in Hong Kong can be traced back to the time when the first computerised Area Traffic Control (ATC) System in Southeast Asia came to operation in the 1970's.

The ATC System is a computerised system that integrates the control and operation of traffic signals within a district.  Since the 1970's, the Transport Department has been expanding the coverage of the ATC systems to all urban areas and new towns in the New Territories.  The systems provide better co-ordination of traffic lights at road intersections to help motorists and pedestrians cross roads and junctions safely and efficiently. As at the end of 2019, there are about 1916 signalized junctions in the territory of which 1880 are under ATC. There are about 808 CCTV cameras at busy traffic spots across the territory to monitor traffic conditions.

Existing and Future Coverage of Area Traffic Control Systems