![]() ![]() This catches the car in the middle of the intersection. ![]() The computer then hesitates briefly and takes another shot. This first shot shows the car just as it is entering the intersection. When a car activates both triggers after the light is red, the computer automatically takes a picture. If the car activates only the first trigger, the computer knows it is stopped at the edge of the intersection. If there is more of a delay, the computer knows the car is moving more slowly. When the triggers are both activated in quick succession, the computer knows a car has moved into the intersection at high speed. In most systems, there are two loop triggers for each lane of traffic. To trigger the cameras, you have to move over the loops at a particular speed. In most systems, the computer will not activate the cameras if a car is just sitting over the induction loops.
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