What’s the difference between overhead traffic signal detectors and inductive loops embedded in the pavement?
answer of yours about damaged sensors
. Some intersections use wire loops buried in the roadway and some use cameras mounted with the traffic lights. Out of curiosity, how do they decide which to use? The wire loops clearly require more maintenance based on the number of times they are mentioned in your articles.A: Traffic signals in San Jose primarily use two sources of vehicle detection, inductive loops and video detection.
While loops are great at detecting vehicles, they are susceptible to being damaged by normal pavement wear and tear and by construction projects. It can take some time to fully repair faulty detection with these more traditional detectors. Video detection is newer technology, and is slowly replacing the pavement-embedded sensors. Some of the benefits of video detection equipment are that repairs can be made faster, and this equipment can observe real-time traffic conditions. The cameras used for this system are mounted on traffic signal poles and are used for detection purposes only. They do not record video that can be viewed afterwards.
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