Roundabout Guidelines

Roundabout Guidelines
Washington State DOT

Roundabout Guidelines Created by Bill Baranowski for Tooele County in 2000.
Tooele County, Utah.

Roundabouts at Maryland State SHA
They have around 35 roundabouts on the state highway system.

Wisconsin State DOT Roundabout Guidelines.
WISCO DOT.

Arizona DOT Roundabouts
Arizona DOT

Michigan Roundabout Examples by DLZ

The New York State (NYSDOT) Roundabout Guidelines
Describes roundabout guildlines published by the Department of Transportation for designing roundabouts in New York. DOT requires design and analysis using RODEL software.

The Florida Roundabout Guide
Briefly describes a guide published by the Florida Department of Transportation for designing roundabouts in Florida. Includes ordering information.

Kansas Roundabout Design Guide and Video

KSU Traffic Discussion Forum

Ourston Roundabout Interchanges
Leif Ourston designed the first three roundabout interchanges in the USA similar to our St. George, Utah Interstate 15 roundabout interchange. His site includes excellent photos of existing roundabout interchanges in Colorado.

New South Wales Updated Roundabout Road Rules
New roundabout driving rules introduced in December 1999 by New South Wales RTA in the Sydney, Australia area. Gives a detailed explanation of how to indicate (signal) when entering and exiting a roundabout. Includes a PDF file of their rules brochure. The rules are generally followed as I found on a visit in March 2000.(Bill Baranowski)

Roundabouts: An Informational Guide
is available on the Internet at the Turner-Fairbank Highway Research Center website. The guide is considered to be the definitive source of information relating to the planning, operation, design and configuration of modern roundabouts in the USA. The book format and CD-ROM version may be obtained from the FHWA Report Center free of charge.

Richfield, MN Roundabout Projects
Check out the countdown timer and the FAQ.

RTE Roundabout Projects
California-Tahoe Roundabout Design Firm.

MTJ Engineering
Wisconsin Roundabout Site.

Roundabouts Canada
Canada Roundabout Site.

Mini-Roundabouts:
Describes a guide to designing mini-roundabouts.

Transportation Research Board Bookstore
Search on "roundabouts" to purchase Modern Roundabout Practice in the United States, NCHRP 264, a Transportation Research Board report on modern roundabout applications in the United States.

The Design of Roundabouts by Mike Brown
Mike's book is available from Her Majesty's Stationery Office for 40 pounds. You can access the book through their virtual bookstore. Complete a search in their virtual bookstore for "The Design of Roundabouts" to find the book.

Oregon Guide-PDF File

CALTRANS Roundabout Guidelines
California state guidelines.

Utah DOT Roundabout Guidelines
The Park City Intermodal roundabout located on SR-224 in Park City and the Bloomington Interchange roundabouts on Interstate 15 in St. George City were approved by UDOT. The state limits roundabouts to 2 circulatory lanes. A roundabout shall be justified based on the following - A capacity analysis shall be conducted to determine the Level of Service (LOS) (delay) for a roundabout compared to a traffic signal or other control devices. The analysis shall be performed using Rodel. The analysis shall compare the LOS based on the delay encountered.

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Roundabout Articles

Roundabouts: A Direct Way to Safer Highways
An article on roundabout safety by Leif Ourston and Joe G. Bared that appeared in Public Roads, Fall 1995.

Crash Reductions Following Installation of Roundabouts in the USA, pdf file
The Insurance Institute for Highway Safety recently released "Crash Reductions Following Installation of Roundabouts in the United States." The study evaluated changes in motor-vehicle crashes following conversion of 24 intersections from stop sign and traffic signal control to modern roundabouts. The settings, located in 8 states, were a mix of urban, suburban and rural environments.

A before-after study was conducted that found significant reductions of 39 percent for all crash severity combined and 76 percent for all injury crashes. Reductions in the numbers of fatal and incapacitating injury crashes were estimated to be about 90 percent. Overall, results are consistent with numerous international studies and suggest that roundabout installation should be strongly promoted as an effective safety treatment for intersections.

 

Roundabout Conferences/Training