That sounds like a Neighborhood Traffic Calming Circle, rather than a roundabout…
Like roundabouts, NTCCs also reduce crashes, but unlike roundabouts, they’re not intended to increase the efficiency of traffic flow. They’re actually intended to do kind of the opposite. Whereas roundabouts get installed in high traffic areas, NTCCs get installed in neighborhoods; places with less traffic and slower speeds. The “TC” in NTCC stands for “traffic calming” and that’s the objective; to decrease vehicle speeds in neighborhoods.
(The question asked there was can you turn left in front of the circle or not. The answer given there is longer than just the paragraph I quoted.)
