PennDOT Study Indicates Roundabouts Reduce Crash Rates

The Pennsylvania Department of Transportation noted Sept. 27 that recent analysis of police-submitted crash reports from 2000 through 2017 shows found that vehicle crashes, injuries, and fatalities all declined at 11 “roundabout” intersections after they were installed.

The agency said in a statement that it reviewed 11 roundabouts on state routes at intersections that were previously controlled by stop signs or traffic lights and that had at least three years of data available before and after the roundabout’s installation.

The results of PennDOT’s study showed that:

  • Fatalities were reduced by 100 percent (from two to zero);
  • Serious injuries were reduced by 100 percent (from seven to zero);
  • Minor injuries were reduced by 95 percent (from 19 to one);
  • Possible/unknown severity injuries were reduced by 92 percent (from 49 to four);
  • Crashes causing only property damage decreased by 2 percent (from 49 to 48); and
  • The total number of crashes dropped 47 percent (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 more are in design, according to PennDOT Secretary Leslie Richards

“Our data shows that modern-day roundabouts reduce crash severity and injuries while improving traffic flow,” she said. “This underscores why roundabouts are becoming more commonplace in Pennsylvania and beyond.”


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