Driving or riding in Argentina is an experience with its own rules. There are laws of course, but few people obey them. In fact, I'm surprised that there aren't more accidents. On the other hand, traffic does flow very well generally, which is more than I could say about UK traffic.
Roundabouts are a really tricky matter because even though the law (such as it is) dictates that you have right of way whilst on one, this is largely ignored at major junctions, even though there are Give Way signs.
Would this work down here? I don't think so, because with everything in Argentina, we make it up as we go along.