The problem is they are to small for two lane travel. there appears to be approx 80ft from entrance to exit at each corner. Traveling at 25mph means you are going about 37 ft per second That gives you 2.1 seconds to merge safely in or out of the circle. Most 2 lane circles I've encountered are 10 times the size and they work. But for that small a circle one lane around would be safer.
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