07-06-2011, 07:27 AM
quote:{insert plethora of links}
Originally posted by james weatherford
quote:No, those ARE NOT ROUNDABOUTS IN D.C.
Originally posted by DTisme
[quote] in Washington, D.C., where roundabouts go back to L'Enfant's original 1789 design.
Those are TRAFFIC CIRCLES and NOT the same as roundabouts.
Design of splitter islands and yield on entry are basic differences.
Same for the "merge" bit above -- that IS NOT what happens at a roundabout.\
a) please don't yell.
b) Of the few links you posted that worked (double-checking links would have been nice; but that's ok, I have time)... this one was the most helpful: http://cityofdavis.org/pw/traffic/roundabouts.cfm
Sorry - don't really see the difference. Car enters roundabout or traffic circle, goes counter-clockwise, exits. Is the difference, then, of scale? Are roundabouts only one-lane? All the samples seem so. Note the photos in the links of successful roundabouts. They seem to be in neighborhoods, not major thoroughfares. Therefore, they seem perfectly suited imho to present 4-stop intersections in HPP and Nanawale, but not on 130, which handles a lot more traffic.
On the differences you've stated: My understanding is that there is yield on entry on traffic circles. You can't just willy-nilly enter the circle. Plus, not all circle entrances have splitter islands, but many do.
(corrected sentence order for clarity)