What are those circular and diamond-shaped objects in the pavement at signalized intersections?
A. The circular and diamond-shaped objects are called traffic loop detectors because they consist of loops of wire buried in the roadway. When a vehicle drives towards an intersection that has a traffic signal, these loops detect the presence of the vehicle and send a message to the control unit of the traffic signal that there is a vehicle approaching. This helps to reduce waiting time for the vehicle and avoids having the signal change if no vehicle is waiting.
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