Lee August Rodegerdts's Books

Roundabouts

An Informational Guide

By: Lee August Rodegerdts,National Cooperative Highway Research Program

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Roundabouts

An Informational Guide

By: Lee August Rodegerdts,National Cooperative Highway Research Program

TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.

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Page Count

407

Publisher

Transportation Research Board

Published Date

ISBN 10

0309155118

ISBN 13

9780309155113

Evaluating the Performance of Corridors with Roundabouts

By: Lee August Rodegerdts,Bastian J. Schroeder,Marcus Brewer

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Evaluating the Performance of Corridors with Roundabouts

By: Lee August Rodegerdts,Bastian J. Schroeder,Marcus Brewer

The objective of this research was to provide traffic engineers, transportation planners, and other practitioners with performance measurement and evaluation methods to evaluate comprehensively the performance of functionally interdependent roundabouts on arterials, thus enabling a comparison with signalized intersections, in order to arrive at a design solution."--Project information.

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Page Count

260

Published Date

ISBN 10

0309284147

ISBN 13

9780309284141

Roundabouts in the United States

By: Lee Rodegerdts

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Roundabouts in the United States

By: Lee Rodegerdts

Research sponsored by the American Association of State Highway and Transporation Officials in cooperation with the Federal Highway Administration.

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125

Publisher

Transportation Research Board

Published Date

ISBN 10

0309098742

ISBN 13

9780309098748

Roundabouts

An Informational Guide

By: Lee August Rodegerdts,National Cooperative Highway Research Program

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Roundabouts

An Informational Guide

By: Lee August Rodegerdts,National Cooperative Highway Research Program

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Page Count

407

Publisher

Transportation Research Board

Published Date

ISBN 10

0309155118

ISBN 13

9780309155113

Roundabout Practices

By: Alek Pochowski,Andy Paul,Lee August Rodegerdts

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Roundabout Practices

By: Alek Pochowski,Andy Paul,Lee August Rodegerdts

As of 2013, there were an estimated 3,200 roundabouts in use throughout the country. This synthesis documents and summarizes roundabout policies, guidance, and practices in place within state departments of transportation (DOTs) as of 2015. The primary focus of the synthesis is on roundabout selection and design with a secondary focus on performance analysis. Information used in this study was gathered through a literature review and a survey of state DOTs. Personnel from seven states were interviewed to create case examples and more specific information. Among the findings, the primary reason cited for the selection of roundabouts is improved safety performance compared with other intersection options, followed by shorter vehicular delays and higher capacity. Planning-level cost estimates (screening or feasibility level estimates) for mini-, single-lane, and multilane roundabouts ranged from $249,000 to $2.05 million. The majority of reporting states have developed some public education materials to support roundabout projects, such as websites, videos, and flyers and/or pamphlets. To analyze roundabout performance, about three-quarters of the reporting states use some form of the Highway Capacity Manual 2010 model and SIDRA’s Standard Model. Most of the reporting states analyze safety performance at roundabouts, using crash modification factors, crash reduction factors, and/or the Highway Safety Manual predictive methodology. Most states use a design life of 20 years when developing the ultimate roundabout design. However, the majority uses a phased implementation approach.

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ISBN 10

0309272084

ISBN 13

9780309272087

Book's by Lee August Rodegerdts

Roundabouts

Roundabouts

Evaluating the Performance of Corridors with Roundabouts

Evaluating the Performance of Corridors with Roundabouts

Roundabouts in the United States

Roundabouts in the United States

Roundabouts

Roundabouts

Roundabout Practices

Roundabout Practices

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