"Every journey in a 20 is increased by a third..."
That assumes that the density of traffic would have allowed 30 mph in the first place.
This morning's drive (late morning, not rush hour) was into Watford, along one of the main roads that go into the town centre which are restricted to 30 mph, with speed cameras. I would guess that the average speed along this two-mile stretch was 15 mph. If you include stops at the several sets of traffic lights it must have been a lot less.
"... it can be argued that pedestrians hit by slower moving traffic are less likely to be killed or seriously injured." It's not a question of whether "it can be argued" - it's fact.
"But inattentiveness at slower speeds by drivers is a factor..."
It may well be, though I've seen no research which backs it up. On the other hand, slower speeds mean there is more reaction time.
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