Roundabouts: An Informational Guide
Source: Turner Fairbank Highway Safety Research Center
The following topics are addressed:
- definition od a roundabout and what distinguishes roundabouts from traffic circles
- public acceptance and legal issues associated with roundabouts
- consideration of all user modes, including heavy vehicles, buses, transit, bicycles and pedestrians
- a methodology for identifying appropriate sites for roundabouts and the range of conditions for which roundabouts offer optimal performance
- methodologies for estimating roundabout capacity, delays, and queues with reference to the Highway Capacity Manual
- design principles and guidance on safety and geometric design, with reference with reference to applicable national standards such as the AASHTO Policy on Geometric Design of Highways and Streets
- guidelines for control features such as signing and pavement markings, with reference to the Manual on Uniform Traffic Control Devices
- illumination
- landscaping
The Tech Brief is available for download, while the full document is accessible at the link below.
