The National Academies

NCHRP 03-130 [Anticipated]

Production of Roundabouts: An Informational Guide, Third Edition

  Project Data
Source: Oregon, Pennsylvania
Funds: $750,000
Staff Responsibility: Amir N. Hanna
Fiscal Year: 2018

This project has been tentatively selected and a project statement (request for proposals) is expected in July 2017. The project statement will be available on this world wide web site. The problem statement below will be the starting point for a panel of experts to develop the project statement.

The publication NCHRP Report 672: Roundabouts: An Informational Guide, Second Edition, published in 2010, serves as the definitive national guide for roundabout planning, analysis, and design in the United States. It has received broad use throughout the transportation profession. FHWA has adopted it as its official guidance on roundabouts, and many states have adopted it in total or in part as part of State standards, guidance, and advice for roundabouts. It has also been used around the world as one of the major international reference documents on roundabouts. A Third Edition needs to be produced for three major reasons:
  1. Since the publication of the Second Edition in 2010, at least 37 major research reports and guidance documents have been produced, reflecting the broad interest in roundabouts at the Federal, State, and local levels. Many of these research reports are the product of funded research from AASHTO and FHWA. Each of these documents reflects advancement of practices in planning, performance assessment, design, and implementation. These advancements now need to be reflected in an updated Guide to have this wealth of new, updated material in one easily accessible and widely accepted document.
  2. The Guide is directly referenced in the AASHTO Policy on Geometric Design of Highways and Streets, as well as many State roadway and facility design manuals. It is important that it contain current and up-to-date information regarding planning, performance assessment, and design practices.
  3. The TRB Committee on Roundabouts (ANB75) has identified research gaps in the material covered in the Second Edition Guide (2010 edition) that have not been covered in the aforementioned research projects or were identified in those projects as continuing research needs. A set of these are anticipated to be of the scale and scope to be included in this edition.
The objective of this research is to develop a Third Edition of Roundabouts: An Informational Guide by updating the current guide and addressing identified gaps in previous design knowledge with the latest information and practices developed since publication of the Second Edition of Roundabouts: An Informational Guide in 2010. This objective should be met through two major tasks: (1) Prioritize gaps in research knowledge and conduct targeted research to fill those gaps. These may include (a) Guidance on design options for accommodating oversize/overweight (OSOW) vehicles and (b) Updated guidance on the use of traffic control devices at roundabouts, suitable for consideration by FHWA and the National Committee on Uniform Traffic Control Devices (NCUTCD) for the next edition of the MUTCD, and (c) Guidance for design of tactile wayfinding surfaces on sidewalks to aid pedestrians with vision disabilities in locating the crosswalk and aligning to cross as identified by the TRB Committee on Roundabouts; and (2) Prepare an updated Third Edition that incorporates research conducted and best practices developed since the Second Edition.

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