Absolutely no reason to go faster and hard evidence that 20mph saves lives.
If that's not enough to back it, when I first learnt to drive I got sent to a speeding course and the teacher tallied up how much time in minutes is saved by driving fast and it's very little.
On the likes of the South Circular, the 20mph limit reduces safe stopping distance between cars, allowing greater volume of traffic. I’d argue that it actually speeds things up in free flowing traffic.
On the off chance that you do save one, the very slight increase in journey times (in urban driving you spend a fair amount of time accelerating, decelerating or waiting. The actual time saved due to going faster is very small) is worth it.
Yes. 30mph is 1/2 miles/minute or 2 minutes/mile. 20mph is 1/3 miles/minute or 3 minutes/mile. The difference is even less with waiting, de/accelerating taken into account.
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