We've built something like that on neighborhood streets in the US in the name of "traffic calming". Usually, it's a planter or an island with a single tree. We

We've built something like that on neighborhood streets in the US in the name of "traffic calming". Usually, it's a planter or an island with a single tree. We still put up 2-way or 4-way stop signs though because traffic circles make our heads explode. In the end, all it really accomplishes is making it hard to see other vehicles at the intersection.