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Appendix E: Spatial Standards for Roundabouts

The City of Green Bay and Brown County have taken steps in recent years to intro-duce roundabouts to intersections as calming devices, replacing the signaled intersections and lines of cars that are commonplace in the roadway landscape today. Issue of traffic control, particularly along Nicolet Drive at the Nicolet and Main entrances was raised during the input and planning sessions. Unfortunately, Wisconsin DOT traffic counts do not warrant the installation of a traffic control measure, such as a stop light, at any of the intersections.

UW-Green Bay has an opportunity to ally itself with the progressive measures being taken in local jurisdictions and create a partnership that could perhaps result in the design and implementation of a roundabout at the Nicolet Entrance to campus. The Master Plan explores this as a viable option and ultimately shows an urban double roundabout at this intersection. A second roundabout, at the intersection of Cam-pus Drive (currently South Campus Drive) and Sports Center road on the UW – Green Bay campus, is designed as an urban compact roundabout. This smaller round-about was added in anticipation of increased traffic due to the construction of the Highway 54/57 and Bay Settlement Road Interchanges as well as the addition of the Kress Events Center, which has the potential to draw larger crowds during events.

The United States Department of Transportation and Federal Highway Administration have created a publication that delves into the issues of roundabouts in the United States and provides examples, spatial standards, and considerations when designing roundabouts for a variety of locations and situations. The spatial standards diagrams included in this appendix are taken from this guide. (Roundabouts: An Informational Guide. U.S. Department of Transportation. Publication Number FHWA-RD-00-067, June 2000). This guide is available to the general public on an unrestricted basis.

 

Vehicle Volume SummaryClick image for larger version

Vehicle Volume Summary

Traffic counts on Nicolet Drive from Mahon to Scottwood Drive during September 23-29 2002 demonstrate that the volume does not warrant the installation of control devices such as a signalized intersections.

Roundabout Standards

Roundabout Standards

“Typical Inscribed circle diameter ranges by roundabout category.” From Roundabouts: An Informational Guide. U.S. Department of Transportation. Publication Number FHWA-RD-00-067, June 2000.

Urband Compact Roundabout

Urban Compact Roundabout

An example of an urban compact roundabout pro-posed at the intersection of Campus Drive (currently South Campus Drive) and Sports Center Drive. From Roundabouts: An Informational Guide. U.S. Department of Transportation. Publication Number FHWA-RD-00-067, June 2000.

Urban Double Roundabout

Urban Double Roundabout

An example of an urban double roundabout proposed at the intersection of Campus Drive (currently South Campus Drive) and Nicolet Drive at the Nicolet Entrance to the UW – Green Bay campus. From Roundabouts: An Informational Guide. U.S. Department of Transportation. Publication Number FHWA-RD-00-067, June 2000.

 

Mini-roundabout Single-lane Roundabout


Rurual Single-lane Roundabout Flared Entry Roundabout

Additional Roundabout Configurations

Examples of other roundabout sizes and configurations. Top left: typical mini-roundabout, top right: typical single-lane roundabout, bottom left: typical rural single lane roundabout, bottom right: typical flared entry roundabout. From Roundabouts: An Informational Guide. U.S. Department of Transportation. Publication Number FHWA-RD-00-067, June 2000.