[ghaff]

There's a certain familiarity factor to using roundabouts and add to that the need for a certain level of trust that other people aren't going to do something stupid. As I wrote elsewhere, there's a clear difference at a busy roundabout I'm familiar with when school gets back in and there are presumably a lot of parents driving it who aren't familiar with it given that big roundabouts in particular aren't common around where I live.