California made a (tiny) push into roundabouts a couple of decades ago, but for some inexplicable reason usually pair them with stop signs. What's the point?
"Tell me you don't understand roundabouts, without telling me you don't understand roundabouts."
California: "Hold my kombucha."
The only roundabouts I've seen in CA with stop signs are the big ones (like the "traffic circle" in Long Beach) where the roundabout is almost a street unto itself.
Come to Palo Alto where they are equipped that way on small residential streets!
Massive ones like you describe don’t need stop signs.