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If a bloke is doing 20 in a 40, with a long stretch of road in front of me, with no traffic coming in the opposite direction, I'm overtaking!!!
Any sensible traffic officer would prefer that than you sitting up their arse, boiling over with frustration, and then taking that stress and anxiety into the rest of your journey. I've got a mate who's best mate is a traffic officer, and he is very understanding of the danger that these dawdlers can cause through their obstructive driving.