The Pennsylvania Department of Transportation (PennDOT) recently announced that according to department data, crashes, injuries and fatalities decreased at 11 roundabouts in the state after they were installed.
PennDOT recently reviewed data for 11 roundabouts on state routes at intersections that were previously stop or signal controlled. These roundabouts were reviewed based on having at least three years of data available before and after the roundabout's installation. These 11 are all the roundabouts on state routes that met the review parameters. Department data based on police-submitted crash reports spanning the years 2000 through 2017 shows that:
- Fatalities were reduced by 100% (from two to zero);
- Serious injuries were reduced by 100% (from seven to zero);
- Minor injuries were reduced by 95% (from 19 to one);
- Possible/unknown severity injuries were reduced by 92% (from 49 to four);
- Crashes causing only property damage decreased by 2% (from 49 to 48); and
- The total number of crashes dropped 47% (from 101 to 54).
In addition to the 11 roundabouts meeting the review criteria, 32 other roundabouts have been installed on state routes and 26 are in design. Roundabouts are frequently installed to address intersections with safety issues, but also may be installed to improve traffic flow as well as other reasons such as traffic calming, and to facilitate pedestrian mobility.