Interesting observations. As a counterpoint, there are a couple of roundabouts between here (Phoenix) and Las Vegas, notable both because there's often fairly h

Interesting observations. As a counterpoint, there are a couple of roundabouts between here (Phoenix) and Las Vegas, notable both because there's often fairly heavy traffic and that almost everyone on the road is from elsewhere (and therefore unfamiliar). They seem to operate quite smoothly, and are a welcome break from waiting for several cycles of traffic lights. I'm curious... where have you seen these troubles? Perhaps the small radius is the real issue?