What is the difference between a traffic circle and a roundabout?
Very generally, roundabouts are small circular roadways built for traffic flow improvement which are designed more meticulously than traffic circles, which sometimes are just the roadway around an obstruction rather than dedicated traffic control. For very detailed information, see http://www.tfhrc.gov/safety/00-0671.pdf , especially Section 1.5 (this is part of http://www.tfhrc.gov/safety/00068.htm ), as well as http://mutcd.fhwa.dot.gov/HTM/2003r1/part3/part3b2.htm#section3B24 . See also http://dmoz.org/Recreation/Roads_and_Highways/Interchanges/Roundabouts/ and http://www.aaroads.com/kick-off/highway.html#roundabout . (Note that some newer traffic circles are not roundabouts, but small “traffic-calming” devices – see http://dmoz.org/Science/Technology/Transportation/Traffic_Calming/ .) Roundabouts are often used in Great Britain at interchanges, either as a large roundabout ( http://www.cbrd.co.uk/reference/interchanges/roundabout.shtml ) or two smaller ones on each site of the moto
