[cogman10]

Yeah... I don't think those will work in the US until roundabouts are a lot more common.

The issue I've seen with them in the US is many US drivers ignore pretty much everything about the painted circle which creates a really dangerous situation. They treat those intersections like 4 way stops (including driving over the circle) and that's a major problem.

[drewzero1]

Not to mention that in large areas of the northern US, any painted road markings are likely to be covered by snow and ice a good portion of the year.