Roundabouts Are Taking Over

[@Krystalsky2700]

TYSM for this, I'll have deeper appreciation to roundabouts next time I'm on it!

[@douglasengle2704]

First, multi-lane traffic circles are historically dangerous and modern multi-lane traffic circles are dangerous, much more so than a traffic light controlled intersection. A modern US roundabout is a very specific traffic circle of single lane with operating speed of 10 mph - 15 mph with yield merge traffic. metering. If the traffic circle is not in that narrow definition is not included in roundabout statistics. It is highway design doctrine that a roundabout is always detrimental to traffic flow on the primary road over a traffic light. A roundabout can function better than a traffic light if both roads have similar traffic volume with a predominance of left turning traffic. Traffic circles behave as traffic calming devices in that they discourage through traffic causing it to seek other routes. As with other traffic calming devices much of the benefits come from reduced traffic volume.