FYI, roundabouts and rotaries are completely different....
Yea, but no one here calls them "roundabouts" and even the signs leading to them say "traffic circle" or at least "circle"... Plus anyways, if you ever say "roundabout" here you will be laughed at (I know this from my own experiences)...
Roundabout
Entering vehicles yield
Vehicles in the roundabout have priority over the entering vehicle
Use deflection to maintain low speed operation
No parking is allowed
Pedestrians are (usually) prohibited from the central island
All vehicles circulate around the central island
Traffic Circle
Stop sign, stop signal, or giving priority to entering vehicles
Allow
weaving areas to resolve conflicted movement
Some large circles provide straight path for higher speed
Some large circles permit parking within the circle
Some large circles allow pedestrians on central island
Mini-traffic circles with left-turning vehicles passing to the left of the central island.