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at网站上有写,是埋在地下的。
https://at.govt.nz/about-us/asse ... -light-maintenance/
Underground vehicle detectors
Vehicle detectors are installed under the road surface close to the stop line on the approach to the intersection. The detector loops register the presence of vehicles by the metal of the vehicle bodies.
The detector loops can detect the presence of slow moving vehicles, stopped vehicles, the queue length and register a demand for a green signal, or extend a green signal.
The detectors might not detect vehicles if the sensors were damaged or vehicles stopped too far from the detectors. |
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