Data Shows Roundabouts Reduce Fatalities, Injuries and Crashes

HARRISBURG – Fatalities, injuries, and crashes decreased overall at 22 roundabouts at 19 locations after they were built, according to the Pennsylvania Department of Transportation.

“We continue to be encouraged by the safety advantages of the modern roundabout,” said PennDOT Secretary Yassmin Gramian. “Lives are being saved and injuries reduced. The data cannot be denied.”

PennDOT recently reviewed data for 22 roundabouts on state routes at intersections that were previously stop or signal controlled. These roundabouts were selected based on having at least three years of crash data available before and after the roundabouts were built.

Department data based on police-submitted crash reports spanning the years 2000 through 2019 shows that fatalities at these locations were reduced by 100 percent and the total number of crashes decreased by 24 percent. Additionally:

Suspected serious injuries were reduced by 78 percent;

Suspected minor injuries were reduced by 62 percent;

Possible/unknown severity injuries were reduced by 82 percent; and

Property damage-only crashes increased by 20 percent. 

In addition to the 22 roundabouts meeting the selection criteria, 34 other roundabouts have been built on state routes and over 40 more are in design. 

In Franklin County, there is one roundabout in Washington Township, with plans for an additional one in the future.

Roundabouts are recognized by the Pennsylvania State Transportation Innovation Council as an innovation that has become standard practice within the transportation community.