Oh how I cannot stand those who insist upon doing 30 in the 50 area.
I'll do 30 in the 50 area if that's the safe speed to do - it's 50 outside our local shops and the place is crawling with children who leap out from behind cars.

TBH I like to think of the speed limit as a rough guide

People need to drive to the conditions and sometimes the conditions and the speed limit appear to contradict each other.