The data cited in the article is based on usage by American drivers. So you can drop your skepticism, they already work.
Anecdotally, they’re converting a number of intersections here in rural, Northern MN to roundabouts and they are _very_ effective at reducing fatalities and injuries.
I guess that depends on your definition of "work." Do they reduce delays? I believe (and have seen) that they can. But I've also seen traffic circles implemented with stop signs in the U.S., a failure.
But hey, I'm down for more to be built in the USA and let's give it a shot.
This is the reason on that traffic related infrastructure is so insane in the US: here we have evidence that roundabouts save lives, but the only thing the American can wonder is how fast they can get through it (to work no doubt).
Anecdotally, they’re converting a number of intersections here in rural, Northern MN to roundabouts and they are _very_ effective at reducing fatalities and injuries.