| 摘要 |
Two lines interconnect a central traffic signal control station with a local control station. The two lines carry signals from the central station to the local station that determines whether the local station is under local or central control. When on central control, the two lines carry signals that cause the traffic signal at the local station to advance to the next condition. In addition, the system includes circuitry that establishes a predetermined interval in which the central station is conditioned to receive signals over the two lines from the local station indicative of a predetermined condition, such as the main thoroughfare signal being green so that a shift between local and central control may be effected without interrupting the smooth flow of traffic during the changeover, and so that central control may continuously monitor the operation of the local control station.
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