A roundabout is a safety countermeasure for reducing the number of potential conflicts (such as left-turns) at an intersection. A roundabout is a circular intersection where the incoming traffic yields to the traffic within the roundabout. Research on 19 rural roundabouts found that they significantly reduced total crashes by 62 to 67 percent and injury crashes by 85 to 88 percent. (

This section provides information on implementing a roundabout.


Research Report

Technical Guide/Manual

Manual for Selecting Safety Improvements on High Risk Rural Roads

This manual provides information on the costs and benefits of safety treatments on high-risk rural roads (HRRR). Agencies can use this manual to determine the f ... [ Read More » ]