Average speed cameras for the A483,A5156 are a no brainer,especially if they incorporate ANPR .They will stop the roads being used as a racetrack.If you stay within the law you have nothing to fear.
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Think you’re missing the issue. It’s not a matter of cars speeding everywhere(have you seen the A483 at rush hour?), it’s more about the extremely minimal impact on environmental benefit the 50 mph will make.