Cars are not a problem, at least not high velocity ones, stopping in stupid places in the town whilst looking for a parking space so the occupants don't have to walk more than 20yds is another matter...
Out of town most cars travel between 45 (farmers checking their sheep & hat wearing volvo drivers) up to around 60. As I said the roads around here a nice driving roads, long straight sections several 2 or
3 miles long, bends where you can see the road ahead for the next 3 or 4 bends and the real traps, bends where you can't actually see but it appears you can.Of course the boy racer(*1) bikes open them up along the straights
100mph+ then end up having to use too much of the road at some of the tighter non obvious blind corners or simply too fast round the ordinary blind bends hitting or having to take evasive action of what ever is just hidden from view, stray sheep, 20mph tractor(*2) or 45mph land rover.(*1) Term used to indicate the more lunatic minority of bikers, not their age.
(*2) Tractors are speed limited to 25mph or there abouts.