Thread: Roundabouts
View Single Post
 
Old 01-31-2015, 09:14 PM
Polar Bear Polar Bear is offline
Sage
Join Date: Jun 2012
Posts: 4,682
Thanks: 222
Thanked 956 Times in 385 Posts
Default Roundabouts

Quote:
Originally Posted by delima2000 View Post
I agree with tomwed one lane in the roundabouts. That would solve all of the problems
Not at all, most especially the ones created by halving the capacity (or worse) trying to funnel all traffic into a single lane.

By the way, TV roundabouts...even with two lanes...meet the definition of a Modern Roundabout. From the Transportation Research Board:

DEFINITION OF THE MODERN ROUNDABOUT:
The term modern roundabout is used in the United States to differentiate it from the nonconforming traffic circles or rotaries that have been in use for many years, primarily in the Northeast. Modern roundabouts are defined by two basic operational and design principles:
1. Yield-at-Entry: Also known as off-side priority or yield to-left rule, yield-at-entry requires that vehicles in the circulatory roadway have the right-of-way and all entering vehicles on the approaches have to wait for a gap in the circulating flow. To maintain fluidity and high capacity, the entry control is a YIELD sign. As opposed to nonconforming traffic circles, modern roundabouts are not designed for weaving movements, thus allowing smaller diameters. Even for multi-lane roundabouts weaving movements are not considered a design or capacity criterion.
2. Deflection for Entering Traffic: No tangential entries are permitted, and no traffic stream gets a straight movement through the intersection. Entering traffic points toward the central island, which deflects vehicles to the right, thus causing low entry speeds.