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Northumberland County Council (and others) will no doubt question the accuracy
I used a professional grade 24GHz OmniPreSense doppler radar sensor unit, with the correct cosine corrections applied, and covertly located. The OmniPreSense website has details on the accuracy of the units.
I have every faith in the accuracy of the unit but - and I don't for a minute think that this is the case - even if there was an inaccuracy of (say) 10% we are still looking at speeds regularly far in excess of the 30mph speed limit.
** One would have to question the accuracy of any non-covert monitoring, regardless of whether a device has 'Home Office Approval' or not - if people see a speed camera, or rubber strips across the road, they slow down. So how accurate is that data?