| 摘要 |
A pull-in and drop-out delay unit for a vehicle detector acting in conjunction with a traffic-light controller installed at a traffic intersection. The detector serves to sense the presence or absence of a vehicle in a zone adjacent the traffic intersection. When the detector senses the presence of a vehicle, the delay unit serves to defer the transfer of the presence signal to the traffic controller for an adjustable period to permit right-turn on "red." When the detector senses the absence of a vehicle, the delay unit defers the transfer of the absence signal to the controller for an adjustable period whereby "tailgating" is minimized and slow-reacting vehicles are more easily passed.
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