Roundabouts effective in improving intersection safety

COLUMBUS, Ohio (Wednesday, Sept. 17, 2025) - This is National Roundabouts Weekwhen transportation officials across the country tout the safety improvement that follows where they're implemented.

Roundabouts are a proven safety tool for decreasing crashes and virtually eliminating crashes that result in serious injuries or deaths.

ODOT analyzed crash data from 76 intersections that had been converted to roundabouts. The data showed that single lane roundabouts decreased injury crashes by 69% while multi-lane roundabouts resulted in a 25% decline.

"Safety is the driving force behind every decision we make, and the results are clear, roundabouts are very effective at reducing crashes and saving lives," said Ohio Department of Transportation (ODOT) Director Pamela Boratyn. "Our goal is to continue to support our local, county, and state partners by providing funding for roundabouts."

In July, Governor Mike DeWine announced an additional $137 million for 55 traffic safety projectsacross the state. Of those projects, 25 include installing roundabouts.

One of the best safety success stories attributed to roundabouts can be found in Clark County. The intersection of State Route 41 and State Route 235 had a long history of serious crashes. Over the past several decades, ODOT installed several countermeasures like rumble strips, multiple stop signs, and flashing beacons. In 2000, a traffic signal was installed. While the signal reduced overall crashes, deadly and serious injury crashes went up. Finally in 2014, a roundabout was installed. In the 11 years since, there has not been a single fatal crash. The lone serious injury crash occurred in 2023 and involved a motorcycle with the rider impaired by drugs and without a helmet or motorcycle endorsement on their license.

Other Examples Around Ohio

• Marion County - SR 98 & SR 529 In the four years prior to the roundabout's construction, there were 37 total crashes at the intersection with nearly 60% resulting in injury. Since the roundabout opened in 2022, there have been 16 crashes with none resulting in injuries.

• Richland County - E. Cook Rd / Illinois Ave & Mansfield-Lucas Rd From 2015-2018, the two-way stop-controlled intersection saw 21 total crashes - an average of five per year - and 15 of those resulted in injury. The roundabout was opened in August 2022 and in the two years since its opening, crashes have decreased by 40% with an average of 3 per year and there have been zero injury crashes.

• Medina County - SR 94 & Granger Road (Granger Township) Since completion in 2018, there have been a total of 18 crashes, averaging just over two crashes per year, and zero fatal or serious injury crashes have occurred. This is a 57% reduction in average yearly crashes.

• Seneca County - US 224 & SR 587 Low-cost enhancements did not improve the crash rate at the intersection, which averaged nearly four crashes a year. Then in 2022, a roundabout was constructed. No crashes have occurred since the roundabout has been in operation.

• Gallia County - SR 160/554
  Before the roundabout was built, the intersection averaged four crashes a year, 67 percent of which resulted in injuries. Since the roundabout was opened in 2021, the intersection has averaged two crashes per year, none of which have resulted in injuries.

You can learn more about the safety benefits of roundabouts and how to navigate them through ODOT's website - transportation.ohio.gov/roundabouts

Locally, roundabouts have exponentially improved intersection safety throughout northwest Ohio. The following are crash stats before and after a roundabout was constructed, and locations where roundabouts are planned: