Some of the most dangerous are those who race around the car park as if the place were empty! These idiots don't drive round carefully at walking pace aware people are wandering around with trolleys, small children could dash out from between cars, other cars are manoeuvering etc. No - speed is king for these people! They'll race around and if you don't get out of their way then it's your fault if they hit you! It's alarming to often see that they are the same young women who race around breaking all the speed limits - with a child seat in the front seat and a dangly sign in the back saying "Beware - child on board!" No 30mph for them!