The Iowa Department of Transportation offers no-cost, expert roundabout reviews during the feasibility, planning, design or operation of roundabouts in Iowa. The DOT is presently using two nationally-known and respected roundabout consulting firms to help ensure early success for roundabouts in Iowa.
Complimentary Roundabout Design Review Service
The Iowa DOT's Traffic Engineering Assistance Program (TEAP) helps small localities by providing expert traffic engineers to gather input and recommend safety improvements, including roundabouts.
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)