Going through roundabouts daily, I have figured out why some folks have a problem and still crash into things in them, when this is completely avoidable.
There are two kinds of people: the person that assumes they will have to stop at the yield sign and wait for someone already in the circle, and therefore approaches at an appropriate speed and can easily stop if needed or can continue on if the circle is empty upon arrival. This is the way it SHOULD be done, and it eradicates nearly all incidents. The second kind of person assumes long before getting to the roundabout that it will likely be empty and so they continue toward it at a high speed and without looking to see who is already in the circle. They generally don't see the person coming around until they are mere feet from the yield sign and must either lock up the brakes or accelerate even more to try to rip through the circle before the other person gets to them. Sometimes they make it, sometimes they don't. These people are idiots.
Moral of the story: ASSUME that there will be be people in the roundabout when you get there and you will have to stop. Prepare accordingly. If you don't have to stop, hurrah, count your good fortunes and carry on. Don't assume it will be empty and speed toward it oblivious to the world around you and then have to do something stupid at the last moment. :shake: