Roundabouts are one-way, circular intersections designed to improve safety and efficiency for motorists, bicyclists and pedestrians. In a roundabout, traffic flows through a center island counterclockwise. A roundabout redirects some of the conflicting traffic, such as left turns, which cause crashes at traditional intersections. This is because drivers enter and exit the roundabout through a series of right-hand turns.
A well-designed roundabout can improve safety, operations and aesthetics of an intersection. Greater safety is achieved primarily by slower speeds and the elimination of more severe crashes and operation is improved by smooth-flowing traffic with less stop-and-go than a signalized intersection. Aesthetics are enhanced by the opportunity for more landscaping and less pavement.
Over the past few years, DOTD has constructed roundabouts across Louisiana in an effort to increase safety and traffic flow at select locations.
For general information on roundabouts including photos and videos, visit the DOTD Roundabouts Project Page.
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Brochures and Engineering Documents