Everything we know about traffic-calming is wrong
Yes. Cobbled Streets. Durable and encouraging of slower driving.
Not actually durable - you'll often find structural subsidence in
cobbled streets. The surface is quite long lasting tho' - but at the
cost of having /very/ low grip, and even worse in the wet!
Subsidence depends on how it's been set. The stones themselves will
last centuries - there are examples of Roman surfaces still around.
Sod grip. You should drive more slowly - as you already do when you
have no grip due to adverse road conditions. The purpose would have
been achieved.
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