These are both within a handful of miles from JC and I.
More than one lane in spots. Not two full circles as you can't just drive around the north one again if you miss your exit. If that happens you have to drive down around the south one and back up again. A little confusing the first time through but really not bad.
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Two more conventional ones in proximity. They are single lane but there is a drive over curb on the inside with another lane width of pavement inside that so larger vehicles have little to no problem negotiating them.
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The most important thing to remember is just like you should wait for people to get off an elevator before you get on, a roundabout gives the right of way to vehicles already in it. Those entering should yield to vehicles in the circle. Whenever I am exiting and there is traffic waiting to enter I signal my exit so they can use the gap to enter. Not many people do that but they should.