| 摘要 |
A system for controlling the traffic signals within a relatively wide district divided into a plurality of subdistricts, in each of which there are distributed many traffic signals at different places. A submaster controller coordinately controls many local controllers within each subdistrict, and a master controller controls all the submaster controllers within the wide district. The master controller gives the same cycle pulses and the same series of synchronizing pulses, but different offsets, to different submaster controllers, and each submaster controller provides a second series of synchronizing pulses, which are displaced in time from the first series of synchronizing pulses by the offset time given to the submaster controller, to the local controllers belonging to the submaster controller, so that the local controllers control their respective traffic signals on the basis of the synchronizing pulses received from the submaster controller. Thus, with proper different offsets given to the different submaster controllers, all the traffic signals in the wide district are coordinately controlled in accordance with the actual traffic conditions in the different subdistricts for establishment of smooth traffic flows throughout the wide district.
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