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Originally Posted by Viney
Hmmm, True velo (Forward facing) do not work on the Doplar effect as do Gatsos. They work on in indution loop in the road. Turning them around will not help, as also the cameras have to, according to regs, have calibration marks.
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true velo cameras don't need marks for the secondary check as they use piezo loops which are a fixed distance apart.. they know the distance and the time before the flash so they can calculate the speed...
i believe they can use them in rear facing situations with some modification (ie the sensors need to be backwards)