Details:

Alternative Title:
Evaluation of Four Recent Traffic and Safety Initiatives, Volume I: Developing Guidelines for Roundabouts
Creators:
Saito, Mitsuru ; Lowry, Michael
Saito, Mitsuru ; Lowry, Michael Less -
Corporate Creators:
Brigham Young University. Dept. of Civil and Environmental Engineering
Corporate Contributors:
Utah. Dept. of Transportation
Subject/TRT Terms:
[+]
Design Guidelines Highway Design Highways I73: Traffic Control Intersections Operations And Traffic Management Roundabouts Safety And Human Factors Traffic Control Traffic Safety
Publication/ Report Number:
UT-04.10
Resource Type:
Tech Report
Geographical Coverage:
United States ; Utah
United States ; Utah Less -
TRIS Online Accession Number:
01473100
Edition:
Final Report February 2003 – June 2004
Contracting Officer:
Stan Burns, UDOT Research Division
Corporate Publisher:
Utah. Dept. of Transportation
Abstract:
Roundabouts have become increasingly popular in the United States in the past ten years. the Utah Department of Transportation (UDOT) has recently installed three roundabouts on its state highways (Park City, Lehi, and Bloomington). Requests for installation of roundabouts replacing traditional intersections are expected to grow. However, UDOT does not have specific guidelines or criteria to judge whether roundabouts would be appropriate for the requested sites. The intent of this project was to summarize the key issues concerning roundabouts and develop a preliminary draft of design guidelines and policies that could be used for the implementation of a roundabout instead of some other form of intersection. Only a few state DOTs had design guidelines on roundabouts at the time of the study. US experiences have not been adequate for creating solid, universal design and analysis guidelines on roundabouts and at the time of the study, a multi-year National Cooperative Highway Research Program (NCHRP) study has just started. The leading software packages used for the design, analysis, and simulation of roundabouts are originated in other countries, such as RODEL (United Kingdom) and aaSIDRA (Australia), where roundabouts have been in existence for many years and in numbers. The former is empirical based on thousands of roundabouts and the latter is based on the gap theory. Engineers do not agree on the best methodology for analysis, and therefore, various software packages with different methodologies exist. The HCS and Synchro 6.0 software programs have gap-based models and their analysis capabilities are not at the level of sophistication as the foreign counterparts. The NCHRP study (NCHRP) 3-65 Applying Roundabouts in the United States is about to be completed at the time of the publication of his report and it is recommended that this report be referenced.
Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:916cfc417cbbd271adc08ed932075f05d584779a22fcf95ccd2d11781aa0965c
Download URL:
https://rosap.ntl.bts.gov/view/dot/37795/dot_37795_DS1.pdf
File Type:

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