Overall, roundabouts are good for cyclists. They reduce crossflow at intersections, sparing us the risk of left crosses and stop sign burners.
Also, depending on the details, slow the speed through the intersections by eliminating straight line flow.
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Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.