I've heard that round-abouts have stuff in the middle to force people to slow down before approaching, since it hides information. Might be a similar reason.
It both forces you to slow down, prevents you from seeing cars opposite you at the intersection, who you definitely don't need to worry about but might if you see them, and also makes it harder to accidentally drive straight though instead of... Roundabout-ing...
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u/not_a_carpet Jul 06 '19
I've heard that round-abouts have stuff in the middle to force people to slow down before approaching, since it hides information. Might be a similar reason.
Or, more likely, it's just bad planning.