I can’t speak for roundabouts, as I don’t know when to use a turn signal in one of those. Hopefully, I’ll learn if I ever get the chance to live there. As for not using turn signals in general, it’s a national problem. And it’s always been one of my pet peeves. Here in WA I would say, at most, 10% signal their turn.
The only discussion I can recall from drivers-ed, during my senior year of HS, pertains to turn signals. Teacher says, always use turn signals even if you’re on a highway and there isn’t another car for 3 miles. Student says, why would you do that? Teacher: why wouldn’t you? Forgetting to signal is a reason, we have all done it. However, there is never an excuse for not signaling a turn.
That whole roundabout thing, I have no idea.
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