HARRISBURG, Pa. - A new study that included a review of two roundabouts in Mercer County found that the traffic circles are significantly safer than traditional intersections.

The Pennsylvania Department of Transportation (PennDOT) reviewed 47 roundabouts, including those at Route 62 and the Shenango Valley Mall and Route 718 (Dock Street) and Connelly Boulevard in Mercer County.

The study found that crashes involving injuries were reduced by 51 percent and the total number of crashes was reduced by 7 percent. PennDOT says there have been two fatalities at roundabouts on state routes over the past 20 years.

"Roundabouts have proven to be an irreplaceable tool in reducing crashes at intersections," said PennDOT Secretary Mike Carroll. "Given the dramatic increase in safety and traffic flow, PennDOT will continue evaluating intersections for roundabouts."  

The study focused on roundabouts that were previously stop- or signal-controlled intersections and had at least three years of crash data available before and after the roundabouts were built. In addition to the roundabouts that met the selection criteria, 46 additional roundabouts have been built on state routes.  

Roundabouts are frequently installed to address safety issues, calm traffic, improve traffic flow, and beautify an intersection. While they are generally safer and more efficient than traditional signalized intersections, they may not always be the best option due to topography or other factors.  

The Pennsylvania State Transportation Innovation Council (STIC) has recognized roundabouts as an innovation that has become standard practice within the transportation community.