[Mordisquitos]

Indeed. In fact, one could argue that a roundabout itself adds no complexity to the rules of the road. A roundabout can be understood simply as a one-way road that has priority over traffic which is joining it, which must give way (="yield" [en_US]) to vehicles already on it.

The fact that this one-way road eventually goes full-circle and connects back onto itself is inconsequential.

[jameshart]

Yes, and even a larger multilane roundabout is just a short stretch of highway that curves round and has a sequence of normal on and off ramps along it. Even the signalling you’re supposed to do is basically exactly what you’d do if you were joining a highway then exiting again.

[JoeAltmaier]

If the turns are labelled, ON THE ROUNDABOUT!

Our local traffic engineer doesn't label the exits. So people STOP and look around, wondering if this is their exit.