Answers: That depends on the location but in broad, yes.
Many traffic light are programmed within a 'wait delay' mode. In nonspecific, this mean that no situation whether there are 50 cars waiting contained by any direction or just one, the hurricane lantern is always going to progress in a fussy sequence.
Other light are linger delay programmed, but can be overridden when a sensor deep-seated in the road is tripped. These sensors are roughly a magnetic loop. When the metal contained by a vehicle disrupts this loop, it trips a switch which lets the fluffy controller know a car is ratification, or waiting to pass. This will shift the traffic lights accordingly.
Hope this help you understand traffic oil lamp sensors.
Yes,but not all lights own them.
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