I grew up in a state that makes heavy use of roundabouts, but they call them rotaries. In general they worked wonderfully for traffic control although I did see

I grew up in a state that makes heavy use of roundabouts, but they call them rotaries. In general they worked wonderfully for traffic control although I did see the end results of a horrific accident when someone managed to go the wrong way on one causing a head-on collision. The ramps were highly angled in the "right" direction so they must have done it on purpose, although I can't imagine why. Now I'm in another city where they are adding them all over the place including a street I commute to every day. The roundabouts here are significantly more dangerous than the ones we had where I grew up. Not only do people here not know how to use them (it's not like they are making people re-take their drivers license tests after installing these things), but they are not as well designed; most of the roundabouts here are being retrofitted into existing small intersections that used to be four-way stops. There's not enough room to curve everything the way so if someone goes when it's not their turn, it's going to be a right-angle collision. I think roundabouts are great in theory, but they need to be done right and people need to be made to learn how to use them.