This intersection is big enough that you can just put a big concrete half-ball or a flowerbed in the middle, put up a bunch of signs that show how to use it, ma

This intersection is big enough that you can just put a big concrete half-ball or a flowerbed in the middle, put up a bunch of signs that show how to use it, maybe add some plastic lane separators that ease cars into a right turn. That's it, a roundabout.