[dfxm12]

You're never going to "solve" traffic problems when people are driving cars, but when you look at the data, crashes that lead to injuries and, importantly, fatalities, go down with roundabouts.

and two or three lane roundabouts with complex exit decisions you need to make on a split second - it's actually very confusing to navigate.

I think you're confusing what today might be called a "rotary" (?) with a modern roundabout. Whatever you call it, I don't think anyone builds what you're describing anymore.

[giantg2]

I've seen 2 lane roundabouts brand new in the US.

[JohnFen]

Same in my part of the US. They're the most common kind, and new ones are constantly being constructed.