One fact that I find very curious is that I see all sorts of animals killed on the road, but never chickens. And I see plenty of them by the road.
Maybe they never try to cross roads?
Maybe they never try to cross roads?
In the mountains around Trondheim, Norway, you run into free range chicken farms (and sheep roaming the mountain top). Signs warn you that chickens are about and I think them getting hit is a real concern if you are maximizing chicken freedom.
That said, these aren't busy roads. The more traffic, the more barriers to keep the animals from getting hit.