We have officially entered a new level of mass stupidity

[dixiegrrrrl]

Someone felt it was necessary to have this sign made AND erected.

[Spider Jerusalem]

1. Not necessarily?

Road surfaces in a lot of places are designed with inherent camber and they're not flat, they're rounded and raised toward the centre for water runoff. With proper drainage and road surface design aquaplaning conditions aren't common on modern roadways in anything but a heavy downpour. But that may not be the case, here (hence the sign).

[KT2000]

2. I think they are referring to

standing water on the road. It certainly happens here and the warning is there because it takes the county a long time to close roads if at all. For some reason the roads near our river are depressed in the middle of the road.