How does an inductive loop work?
Inductive loops are either diamond shaped or rectangular loops of wire generally sawed into the surface of the pavement. The wire is stranded copper wire in a weatherproof tubing. A very small amount of electricity flows through the wires, creating a magnetic field. When a vehicle pulls over the loop, it causes a disruption in the magnetic field. A detector in the controller cabinet detects the disruption and sends a signal to the controller indicating the presence of a vehicle.

Show All Answers

1. What method does the city use to detect vehicles at traffic signals?
2. How does an inductive loop work?
3. Does the weight of my vehicle matter?
4. What has the city done to improve detection of motorcycles and bicycles?
5. What is video detection?
6. How do I report a traffic signal malfunction?