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Over the last 25 years, roundabouts have been used in the United States to reduce crashes, traffic delays, fuel consumption, air pollution, and construction and maintenance costs.
Roundabouts often move more traffic compared to other intersection options and enhance intersection beauty. They have also been used to manage speed in residential neighborhoods and are accepted as one of the safest types of intersection designs. Roundabouts are specifically designed for urban, suburban, and rural locations to accommodate various vehicle types.
The Iowa DOT and other communities in Iowa use roundabouts in certain situations to enhance safety and reduce delays encountered by the motoring public.
Roundabouts have been used effectively throughout the world for many years.
Iowa has over 150 roundabouts across the state, with 10-15 new ones constructed each year since 2015. Approximately 15-20 roundabouts are on Iowa DOT’s Primary highway system, and more are in different stages of planning, design, or construction. As a comparison, the State of Iowa has approximately 115,000 paved intersections, with about 15,000 of those on the state Primary highway system. Roundabouts currently make up about one out of every 1,000 intersections.
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