Many local jurisdictions that have installed roundabouts have realized these same benefits, with perhaps the best example being Butler County. The County constructed their first two roundabouts in 2008 and now have a total of 20 that are operational or in some phase of the planning and design process.
Butler County Engineer Greg Wilkens stated his office has seen a 100 percent reduction in fatal crashes, an 80 percent reduction in injury crashes, and a 65 percent reduction in total crashes while at the same time seeing an increase in capacity.
Additionally, Wilkens acknowledged apprehension about installing the County’s first roundabout next to Lakota West High School but, when speaking about the students’ learning curve, he said, “They adapted readily. It wasn’t a problem for them.”
In Greater Cincinnati, approximately 30 roundabouts are currently operational with another 20 or more expected to become operational within the next five years. The City of Mason, the City of Blue Ash, Warren County, Clermont County, and Butler County all have multiple roundabouts currently operating. Several operational multilane roundabouts, like the Montgomery Road and Ronald Reagan Cross County Highway roundabout, are highlighted below.
- KY 8 and York Street, Newport, KY: a multilane roundabout with left-turn lanes (spirals)
- Eastgate Drive and Clepper Lane, Clermont County, OH: multilane roundabout with left-turn lanes (spirals)
- Socialville-Foster Road and Innovation Way, Mason, OH: partial multilane roundabout, expandable to full multilane roundabout.