Comment by throw0101c

> The fact that you mention light-controlled roundabouts highlights that they do not, actually, "work perfectly fine".

I don't think anyone is claiming that roundabouts work in every and all situations: design handbooks often say they're good 'up to X vehicles per hour/day'.[1] But that does not mean they do not work, or not useful, for <X.

Intersections are an engineering problem, and there is a hardly ever an engineering solution that works everywhere and always. There is usually a spectrum of solutions for the various situations that are faced.

[1] https://www.fhwa.dot.gov/publications/research/safety/00067/... § 1.6.1, 3.3.1