[EMAIL PROTECTED] wrote:
I wonder if Roundabouts have ever been considered for major streets in Mpls. That's a very efficient concept for making all turns right hand turns. Note I say "concept", I don't really know how they work in large cities. Anybody on the list done enough driving in D.C. to report?
Jon Gorder
Cathedral Hill where there exists the only roundabout I know of in the cities.
Traffic circles or roundabouts with modern non-tangential yield upon entry rules seem to work well where ever they are used. I can only personally testify to the one in Minneapolis at Minnehaha Parkway and Minnehaha Avenue, the several in Washington D.C. and the too numerous to count in Great Britain, France, Austria and Germany -- and they all worked well, although I have to admit the drivers here in Minneapolis appear to be the most confused of the bunch as to what to do. The rules are simple. Learn them once and why they are they way they are, and they should stick with you forever.
However, there are places they work better than others, and places where they don't work so well. Traffic engineers who keep up with, or bone up on, the latest in professional writings on the subject would have the quantitative tools to calculate which intersections on Lake Street, if any, would benefit.
In general, yes, they work in large cities. London and Washington D.C. are both quite a bit larger than the Twin Cities.
Here's some general information about traffic circles and usage in the U.S. and Canada:
http://www.drivers.com/article/334
http://www.city.hamilton.on.ca/public-works/Roads-And-Traffic/roundabout.asp
http://www.roundaboutsusa.com/
Chris Johnson, Fulton
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