@wxcafe Strongly agree. American culture has an absolute NIH fetish and many will fight tooth-and-nail to preserve absurdities. Imperial measurements, 12-hours x 2 days, for-profit healthcare, 90° intersections instead of traffic circles, the list goes on. 
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@rowens unless you're in the northeast, where traffic circles are a hecking way of life
We got one of these and it makes my brain hurt https://en.m.wikipedia.org/wiki/Diverging_diamond_interchange
@pmosetc *blink* *blink* Huh. That's... something.
​ Mainly though they just work, and traffic just flows, in spite of the naysayers.
Re. circles, they're being incorporated into new construction here in Montana (started 3? 4? years ago, maybe more). Plenty of grumbling about 'em, and lots of folks still have no clue how to use signals on circles. OTOH, many of those same drivers think signals are optional at all times, so technically it's not a big change.