Active Transportation Plan - City of Pomona

Pomona Active Transportation Plan
November 2012
Chapter 8 – Bicycle and Pedestrian Design Guidelines
Roundabouts
Single-lane roundabout in La Jolla, CA
Description
A roundabout is an intersection design that can replace traffic signals. Users approach the intersection,
slow down, stop and/or yield to pedestrians in a crosswalk, and then enter a circulating roadway, yielding
to drivers already in the roundabout. The circulating roadway encircles a central island around which
vehicles travel counterclockwise.
Benefits
• Reduce conflicts, all forms of crashes and crash severity (particularly left-turn and right-angle
crashes)
• Little to no delay for pedestrians
• Improved accessibility for bicyclists
• Approximately 30% more vehicle capacity than signals (allowing possible reduction in number of
lanes and roadway width)
• Reduced maintenance and operational costs, delay, travel time, and vehicle queue lengths
Key Design Features
• Deflection encourages slow traffic speeds,
• Landscaped visual obstruction in the central island discourage users from entering the
roundabout at high speeds
• Central island should not contain attractions
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