The number of roundabouts controlling traffic at intersections is growing, in California and in the entire US.  Roundabouts have a long track record of safety improvement at intersections, greatly reducing the number of fatalities and serious injuries when they are deployed.  Roundabouts can be recognized because there are Yield signs on all approaches to roundabouts (no Stop signs), and there is usually a raised island to the left of each driver approaching the intersections that guides them...
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