I have 2 roundabouts between my house and the highway. First thing to understand is to NEVER expect drivers to act logically or ethically in the roundabout. When driving, I NEVER allow myself to be broadside of another car because on multiple occasions, I have had cars cross over into my lane as if I wasn't even there. Like if I'm on the inside, the outside car has cut me off, or if I'm in the outside (in an exit-only lane) the inside car crosses over and cuts in front of me, like more than 50% of the time. Never trust any driver in a roundabout at any time.