the first few years were rough when people tended to treat them like 4-way stops but most people have figured them out although they slow down. There are advisory speed signs like 15 or 25 mph but I figure if it's on a 45 mph road, you go through it at 45.
These aren't the huge rotaries like back east so 45 is going to rearrange the groceries in back. I go a little slower if I'm carrying eggs.