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well there are BIG circles that are an aid to traffic flow
and small tight little circles that are a well planned bottleneck
thats what they are useing in the traffic calming plans
an unneeded obstruction in the middle of a 50 by 50 right of way intersection
that has sidewalks and grass swall then add tight curbs outside and inside
so you are left with a under sized one lane tight turn around of about 25' radius
too small for a truck, rec-v, or towing a trailer,
then string a 1/2 doz of them per mile on a well used street
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