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@adroit
They are either induction loop ( so they detect a metal object passing over it) or they sense heat (infra red)
Cyclists sometimes don't trigger them because the sensors are not set to detect that level of signal. It is easy to set them to detect a car, but the tuning of them is harder at smaller signal inputs.
Report them, but using fillthathole, or fixmystreet, don't use the local authority sites because they don't report their performance at fixing things as both the independent ones do.