These don't work in the U.S. as everyone fantasizes they do. An important note: in the U.S., the vast majority of jurisdictions permit making a right turn on a

These don't work in the U.S. as everyone fantasizes they do. An important note: in the U.S., the vast majority of jurisdictions permit making a right turn on a red light, and some, including the state of Oregon, permit making a left turn onto a one way road from a red light. In high congestion areas, such as here in Las Vegas Valley, many drivers will not fill a right lane at a red light when they are not turning right as a courtesy to those needing to turn right at the intersection. During commute hours, everyone disobeys all laws to get home or get to work. When there are regularly spaced roundabouts on a long stretch of road, drivers get exceptionally impatient and will drive at the performance limits of the vehicles, late-braking like they are F1 drivers. This ends up grouping all of the drivers into a very solid wolf pack who will not stop for anyone and will speed through the roundabout, making it impossible for pedestrians and drivers other onramps to enter the roundabout. The vast majority of drivers do not know how to use the roundabout, as is evidenced when they enter from the left lane of a two-lane road and use the exit lane that is only marked for use from the right lane. Americans who know how to use the roundabout respond to this by habitually stopping at the roundabout entrance when they see a car in any lane entering the roundabout at high speed, which is most vehicles. Then the drivers behind the stopped vehicle think the stopped vehicle is driven by someone who doesn't know how to drive on a roundabout and begin honking incessantly or attempting to illegally pass the stopped driver. Henderson, Nevada provides many such examples of this. Most interesting to me is that parts of the town have nearly identical roads that are served by either only traffic signals or only roundabouts. My experience is that the roads with traffic signals have far fewer issues than the roads with roundabouts.