Just came off south bound M25 onto the M4 and the slip road has a sign "Adverse camber".
Daughter didn't fully understand what it mean so I was trying to explain, then wife pipes up saying "it's a bit of a bog admission to have to put a sign up admitting that they built it wrong". I said I thought they probably deliberately designed with with no or adverse camber to slow traffic, as I cannot believe that it was a mistake, what with the millions it takes to design and build a new road.
So for the next few minutes we discussed it, and, not reaching any conclusion, I thought I'd ask the collective brains here. Why are roads built with an adverse camber?
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