Flip side of that argument is that when all residential areas are 20, not only will there be no confusion as to what the limit is (did I miss a signpost?), but drivers will also be more practiced at driving at 20 mph
Also, I think this has to be considered as part of an overall strategy, including more pedestrianisation, better public transport, greener cars, etc.
While not every driver will do it - when I see a 20 limit in a school zone for instance I'll straight away be thinking - will a kid run out from behind a parked car?, the hazards of buses unloading or loading kids, etc. those will be at the forefront of my mind and actively scanning for those hazards and similar for other areas where there is a specific reason for a 20 - the average driver will have a heightened sense for the specific reason for that 20. If 20s become common place you lose that.
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