Speed traps on Hwy 130

[james weatherford]

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Originally posted by james weatherford

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Originally posted by Bob Orts

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Originally posted by EightFingers

How much land will a typical roundabout require?

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60% increase in ROW.

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Bob, what is your source on this?
The general description (I'll dig out the ref) is something like this:
A roundabout requires more space within the intersection.
A signal intersection requires more space leading up to the intersection when there is a right turn lane.
The total difference may be nil.
James Weatherford, Ph.D.
15-1888 Hialoa
Hawaiian Paradise Park

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Here is a basic ref. Others are in agreement. http://www.tfhrc.gov/safety/00-0673.pdf pages 69-70 explains spatial requirements in detail.

"Although roundabouts typically require more area at the junction
compared to conventional intersections, they may not need as
much area on the approaches."

"...flared roundabouts offer the most potential for
reducing spatial requirements on the approaches as compared to conventional intersections. This effect of providing capacity at the intersections while reducing lane requirements between intersections, known as “wide nodes and narrow roads...”



James Weatherford, Ph.D.
15-1888 Hialoa
Hawaiian Paradise Park