Inside South Carolina Department of Transportation

Safety & Benefits

Roundabouts are safer due to slower speeds and the counterclockwise only movement. In national studies, roundabouts have been found to reduce total crashes by 35%, injury crashes by 75% and fatal crashes by 90%.

South Carolina has seen similar improvements in safety. Based upon an evaluation of 12 single lane roundabouts in use since 2011, total crashes were reduced 66% and injury and fatal crashes were reduced 79% and 100%, respectively.


  • Total Crash Reduction: 66%
  • Injury Crash Reduction: 79%
  • Fatal Crash Reduction: 100%