Recently drove in Scotland where built up areas generally have 20mph speed limits. I found It made little difference in overall journey time Felt safer, stopping distance much reduced Easier to join the traffic Similar speed as cyclists Felt safer and more relaxed as a pedestrian, easier to cross the road
Countdown until they david-nutt the researchers for daring to contradict government policy with evidence.
30 limits should be opt-in: Chosen for roads it suits, rather than the current opt-out. There are often narrow residential roads which really should be 20, but there isn’t enough evidence due to the low traffic volume.