. . . And Where Is Iowa DOT Constructing Roundabouts?
Iowa has over 150 roundabouts across the state, with 10-15 new roundabouts constructed each year since 2015. Approximately 20 roundabouts are on Iowa DOT’s Primary highway system, with 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 paved intersections.
The map and link below show an inventory of Roundabouts in Iowa – on the Primary Highway System, Secondary (County) Roads, and Municipal (City) Streets.
Additional Information
Roundabouts are being constructed around the World, the USA, and the Midwest. Follow these links for more information:
- Federal Highway Administration – Proven Safety Countermeasures
- Insurance Institute of Highway Safety (IIHS) – Studies on safety, efficiency, public opinion before/after construction
Iowa State University Institute for Transportation
2008 Roundabout Guidance for the Iowa DOT
- Roundabouts in Minnesota
- 2017 A Study of the Traffic Safety at Roundabouts in Minnesota
- Roundabouts in Wisconsin
- Roundabouts in Missouri
- Roundabouts in Nebraska
- Roundabouts Around the World – Inventory Map (Kittleson & Associates)