When you approach a round about you must slow down, check your right, and then proceed. It works the same as a stop or yield sign. In a 2 lane roundabout both

When you approach a round about you must slow down, check your right, and then proceed. It works the same as a stop or yield sign. In a 2 lane roundabout both lanes should be free before moving into it. I mean, you can't rely on stop lights either. I've seen plenty of people run reds. What do you do then?