别误解， 那是智能控制红绿灯时间的， 不是抓超速的。

来源: gegenion 于 2014-12-09 15:05:53 [] [旧帖] [给我悄悄话] 阅读数 : 0 (1034 bytes)


What are the cameras for?

The overhead cameras you see at a traffic signal are solely for detecting the presence of vehicles in order to provide the best distribution of green time based on traffic demand. They are cost-effective replacements for in-ground induction loops that are cut into the pavement.

The cameras are not focused on you the driver, but instead on your vehicle as it moves towards the intersection. As your vehicle enters defined areas or "zones" within the camera's field of view, the camera's processor detects a change in the "zone". An output is sent to the traffic signal's controller (the computerized "brain" housed in a nearby metallic cabinet controlling the intersection's timing) that says a vehicle is requesting green time for its direction.

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