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There are lights in my area (SF Bay Area) that are influenced by magnetic loop detectors placed well back of the intersection. Those seem to be calibrated to trigger with cars going over them at a pretty high rate of speed (I think they'll work at 50 MPH but I haven't tried) because this is on an off-ramp. I find if there is no traffic waiting on the cross-street, if I glide over the detector at 20-25 MPH I will hit the light green.
-soD
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