First, US roundabouts statistically mirror European experience--50% reduction
in collisions, 70% injuries decrease, and less severe injuries. In about
7-roundabout years in Vermont (Montpelier and Manchester) there has yet to be
a reportable two-car collision. Yes, Americans are smart enough drivers to
handle roundabouts! The Long Beach reference is interestings--this was one
of the worst intersections on the Pacific Coast Highway as a traffic circle
and Caltrans allowed basic revision to a roundabout and now it is of the
freest flowing intersections. Accidents, dropped and daily gridlock is a
thing of the past. However, Caltrans would not allow shrinking the huge
circle several hndred feet in diameter down to a "roundabout size" (150-200
feet for this multi entry beauty). Leave that--and the further reduction in
accidents and reduced travel times--for a future day.
Yes, opening seasons of roundabouts are chaotic,but the new environment is
forgiving and one study of 181 new roundies shows slightly lower accident
rates in the first six months than subsequent. Roundabouts work well right
from the start!
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