Module 1 A Nationally Emerging Practice Introduction to Roundabouts Roundabouts in the United States

Module 1—Introduction Roundabouts in the United States Module 1—Introduction Roundabouts in the United States Traffic Engineering Traffic engineering principles are well rooted in history. Sometime in the early 1800’s traffic management became an issue. PHOTOGRAPHY SOURCE: David Plazack

Module 1—Introduction Roundabouts in the United States Module 1—Introduction Roundabouts in the United States Intersections Intersections have always been a primary concern for transportation professionals. As traffic volumes increase, configuration of the intersection can be modified to accommodate traffic.

Module 1—Introduction Roundabouts in the United States Module 1—Introduction Roundabouts in the United States Intersection Traffic Control Early forms of intersection traffic control required the presence of a human operator. Traffic signals and pedestrian activated devices have become the preferred method to manage traffic through intersections.

Module 1—Introduction Roundabouts in the United States Module 1—Introduction Roundabouts in the United States Circular intersections PHOTOGRAPHY SOURCE: United States Geographic Survey Dupont Circle, Washington DC Circular intersections have been used in this country in the past.

Module 1—Introduction Roundabouts in the United States Module 1—Introduction Roundabouts in the United States Roundabouts: An alternative The roundabout is yield controlled, traffic flows with fewer stops. Air quality also benefits when motorized traffic is kept in motion. PHOTOGRAPHY SOURCE: Lee Rodegerdts

Module 1—Introduction Roundabouts in the United States Module 1—Introduction Roundabouts in the United States Roundabout Rules of the Road The rules for traveling through a roundabout are easily explained and will eventually be included in most state driver’s manuals. Special brochures also introduce these new additions to the public.

Module 1—Introduction Roundabouts in the United States Module 1—Introduction Roundabouts in the United States The Future of the Modern Roundabout As safety and environmental advantages become recognized, roundabouts will be adopted by transportation professionals just like other technological advances. Photo: Maryland SHA