common for densly populated European style cities, efficient at keeping the flow of traffic moving supposedly like a revolving door, but at some point there is a maximum load on the circle and thus no more vehicles can enter it efficiently.
Also no need for stoplights, just stop signs, in some countries I have been there are combos of circles and fly overs so that those going truly straight through the circle and continue at full speed, those needing to enter the circle leave the highspeed track to go to the circle.
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