Some time ago, I made a mock up of a roundabout that attempts to eliminate the vagaries of negotiating them. Here’s a link to it:
http://edv100.home.comcast.net/~edv1...roundabout.jpg
It is a right lane for right turn only configuration that also has (red) barriers that prevent the driver in the right hand lane from making anything other than a right hand turn. It’s not perfect but does eliminate the situation where vehicles end up crossing each other’s paths.
I fully understand the roundabout rules and agree that if everyone understood and followed them precisely, there wouldn’t be problems. But that just isn’t going to happen. So the next best thing is to try to make the roundabouts idiot proof.