Bing aerial imagery is actually fairly clear for this area. There is indeed a raised concrete median running along the centre of Harbour Street between the two mini roundabouts, and so I have left that be (with some minor positioning tweaks).
The roundabout mentioned in the original comment is indeed a simple mini roundabout judging from the Bing imagery. I have adjusted the connecting roads in response, tagging them with turning lanes as appropriate. See changeset #95010979.