How does it know when to change and what to prioritize? I.e. the first car that got to the intersection, left turn arrows first, one side first, etc.. is it on a timer and takes the sensors into account or what?
In: Engineering
Well, for one, they often use electromagnetic metal sensors instead of weight. But typically that data is fed to a computer, and different computers are programmed differently. In some cases, for instance, the computer may always keep one direction green, but change when a car is detected.
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