nchrp research report 1043

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Roundabouts

Roundabouts are a  Proven Safety Countermeasure  because they can substantially reduce crashes that result in serious injury or death. Roundabouts can:

• Improve safety
• Promote lower speeds and traffic calming
• Reduce conflict points
• Lead to improved operational performance
• Meet a wide range of traffic conditions because they are versatile in size, shape, and design

Outreach and Education Resources

• Roundabout Rules Video
• Roundabout Rules PDF
• Audio Recording  
• Modern Roundabouts: An Innovative Solution to Intersection Safety Concerns – Video
• PDF (English)
• PDF (Spanish)
• PDF   *Please note that this graphic is not intended to be a design template or a standard for roundabouts. Shown  here at a trade show.
• National Roundabouts Week web page (#RoundaboutsWeek)
• Roundabouts with Pedestrians and Bicycles – A Safe Choice for Everyone
• Roundabouts and First Responders – Saving Lives Together
• Roundabouts along Rural Highways
• Roundabouts and Tribal Governments
• Carmel, IN, Engages the Public through Print and Web Outreach
• Washington County, MN, Educates Drivers through "Roundabout U"
• Washington State Focuses on Outreach, Illustrates How to Drive a Roundabout
• Bend, OR, Teaches through Children Using Coloring Books to Communicate about Roundabouts
• Missouri DOT Convinces Skeptics That Roundabouts Work
• Iowa DOT Provides "Expert–on–Hand" Technical Assistance to Promote Roundabouts
• Virginia DOT's Roundabouts Review Committee Spearheads Outreach Efforts
• Brown County, WI, Roundabouts Calm Traffic, Improve School Zone Safety
• Clearwater, FL, Public Charrettes Produce Strong Support for Roundabouts
• Sioux Falls, SD, Conducts Roundabout Rodeo
• Washington State DOT Hosts Roundabout Rodeo
• Montpelier, VT, Constructs Roundabout with Local Roundabouts Steering Committee
• Madison, WI, Makes Roundabouts Work for Pedestrians and Bicycles
• Wisconsin DOT Engages Freight Stakeholders in the Roundabout Design Process
• Santa Cruz, CA, Chooses a Roundabout as a Multimodal Solution
• Austin, TX, Hosting General Information Briefings to Promote Roundabouts
• Kansas DOT Designing Roundabouts for Truck Traffic

Technical Materials and Research

• Guide for Roundabouts (NCHRP Report 1043)
• Synthesis Report
• Technical Primer
• Volume I – Evaluation of Rectangular Rapid-Flashing Beacons (RRFB) at Multilane Roundabouts – Final Repor t
• Volume II – Assessment of Roundabout Capacity Models for the Highway Capacity Manual – Final Report
• Volume III – Assessment of the Environmental Characteristics of Roundabouts – Final Report
• Volume IV – Review of Fatal and Severe Injury Crashes at Roundabouts – Final Report
• Volume V – Evaluation of Geometric Parameters that Affect Truck Maneuvering and Stability – Final Report
• Volume VI – Investigation of Crosswalk Design and Driver Behaviors – Final Report
• Volume VII – Human Factor Assessment of Traffic Control Device Effectiveness – Final Report
• Temporary Traffic Control for Building & Maintaining Single & Multilane Roundabouts
• Roundabout Practices (NCHRP Synthesis 488)
• Estimating the Life–Cycle Cost of Intersection Designs (NCHRP Web–Only Document 220)
• Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities – A Guidebook (NCHRP Report 834)
• Evaluating the Performance of Corridors with Roundabouts (NCHRP Report 772)
• A Study of the Traffic Safety at Roundabouts in Minnesota
• Evaluation of Safety and Mobility of Two–Lane Roundabouts
• Strategies for Effective Roundabout Approach Speed Reduction
• Accommodating Oversize/Overweight (OSOW) Vehicles at Roundabouts

Connections to Other Transportation Safety Topics

• Roundabouts can be designed to safely accommodate both pedestrians and bicycles
• Roundabouts are an effective speed management strategy
• Roundabouts can be part of an effective corridor access management plan
• Roundabouts work as great intersection designs for road diet  projects
• Pavement friction plays an important role in road safety performance, including at intersections
• The Manual on Uniform Traffic Control Devices for Streets and Highways provides the national standards for all traffic control devices, including pavement markings, signs, and traffic signals

Guide for Roundabouts

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June 14, 2023 NCHRP Releases the New Guide for Roundabouts

by Megan Nelson

After five years of research and development, we are so excited to see NCHRP Research Report 1043: Guide for Roundabouts published and ready to be implemented on projects. NCHRP Research Report 1043 supersedes NCHRP Report 672: Roundabouts: An Informational Guide—Second Edition, which has been the nation’s go-to guide for the planning and design of roundabouts since 2010.

Why create a new roundabout guide? In short, much has changed in the past 13 years! Since the publication of NCHRP Report 672, a significant amount of roundabout research has been conducted. Our nation has also constructed many roundabouts in that time period (see the Roundabouts Database for the latest counts!), providing practical knowledge that has fueled additional research. NCHRP sought a new guide that would bring together the latest in roundabout research, best practices from the field, and advancements in transportation technology.

To do this, Kittelson & Associates, Inc. reviewed the latest existing planning and design guidance at the state and national level, connected with practitioners across the country to learn from their experiences, and conducted additional research, particularly around serving large trucks and designing for bicycles at roundabouts. The new guide synthesizes what we learned and presents a performance-based approach to the design of roundabouts. It includes guidance for mini-roundabouts and compact roundabouts, pedestrian crossings, traffic control devices, illumination, retrofitting existing roundabouts, and many other aspects of roundabout planning, design, and implementation.

After playing key roles in the development of preceding roundabout guides (FHWA’s Roundabouts: An Informational Guide in 2000 and NCHRP Report 672, Roundabouts: An Informational Guide Second Edition in 2010), it was meaningful for our friends at Kittelson to have the opportunity to lead the development of this latest guide. We have many strong partners to thank, including Sunrise Transportation Strategies, Texas A&M Transportation Institute, Kimley-Horn, and Accessible Design for the Blind.

NCHRP Research Report 1043 is available to be downloaded here on TRB’s website . After years of working hard toward the release of this guide, we’re excited to see it out in the world and hope it proves useful in your next projects! To learn more, contact Julia Knudsen , who managed the guide’s development, or Lee Rodegerdts , who served as a key author and as Principal Investigator for the early stages of the project.

Guide for Roundabouts (2023)

Chapter: part i - introduction to roundabouts.

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

P A R T I Introduction to Roundabouts Part I: Introduction to Roundabouts Chapter 1: Introduction Chapter 2: Roundabout Characteristics and Applications PR O JE CT DE VE L O PM EN T P R O CE S S Planning Part II: Planning and Stak eh older Considerations Chapter 3: A Performance-Based Planning and Design Approach Chapter 4: User Considerations Chapter 5: Stakeholder Considerations Chapter 6: Intersection Control Evaluation Identify and Evaluate Alternatives Part III: Roundabout Evaluation and Conceptual Design Chapter 7: Safety Performance Analysis Chapter 8: Operational Performance Analysis Chapter 9: Geometric Design Process and Performance Checks Preliminary Design Part IV: Horizontal, Vertical, and Cross- Section Design Chapter 10: Horizontal Alignment and Design Chapter 11: Vertical Alignment and Cross-Section Design Final Design Part V: Final Design and Implementation Chapter 12: Traffic Control Devices and Applications Chapter 13: Curb and Pavement Details Chapter 14: Illumination, Landscaping, and Artwork Chapter 15: Construction and Maintenance Construction, Operations, and Maintenance Supplemental Appendix Appendix: Design Performance Check Techniques

Roundabout implementation in the United States has increased in the last decade, and practitioners have learned lessons in successfully applying roundabouts in various land use and transportation environments and contexts.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 1043: Guide for Roundabouts provides information and guidance on all aspects of roundabouts.

Supplemental to the report is NCHRP Web-Only Document 347: Background and Summary of a Guide for Roundabouts , which describes the research for and development of the guide.

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TRID the TRIS and ITRD database

Guide for Roundabouts

Since its publication in 2010, NCHRP Report 672: Roundabouts: An Informational Guide, Second Edition, has served as a national guide on the different aspects of roundabouts, including planning, analysis, design, and construction. Also during this period, technology changes have taken place, substantial research on the different aspects of roundabouts has been performed, and many roundabouts have been constructed. This research and experience gained from these projects has produced many relevant findings and lessons learned. However, additional research is needed to address the gaps in available roundabout guidance and incorporate the relevant technology, the findings of the new and earlier research, and the lessons learned from the constructed projects into a guide for roundabouts. This guide will provide updated information and guidance on all aspects of roundabouts and help highway agencies and other organizations address relevant issues when considering the planning and implementation of roundabouts. The objective of this research is to develop a guide that will serve as the primary source for guidance on all aspects of roundabouts. The guide will supersede NCHRP Report 672: Roundabouts: An Informational Guide, and other available guidance on roundabouts.

• Record URL: http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4354
• Research is complete. The guide is available as NCHRP Research Report 1043, and the work leading to guide developmemt is described in Background and Summary available as NCHRP Web-Only Document 347.
• Status: Completed
• Funding: $750000

Project 03-130

National Cooperative Highway Research Program

American Association of State Highway and Transportation Officials (AASHTO)

Federal Highway Administration

Hanna, Amir

Kittelson and Associates, Incorporated

• Start Date: 20180601
• Expected Completion Date: 20220930
• Actual Completion Date: 0
• Source Data: RiP Project 41597

Subject/Index Terms

• TRT Terms: Guidelines ; Handbooks ; Highway design ; Highway traffic control ; Roundabouts
• Identifier Terms: Manual on Uniform Traffic Control Devices
• Subject Areas: Design; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 01634647
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 03-130
• Files: TRB, RIP
• Created Date: May 12 2017 10:44AM

24 Things to Know About TRB 2024

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Coming up in early January, the 2024 Annual Meeting of the Transportation Research Board (TRB) will once again draw more than 10,000 transportation researchers, practitioners, and enthusiasts in an action-packed week of research presentations, panels, committee meetings and conversations. Whether it’s your first Annual Meeting or you’ve been going for 20 years, there’s something fresh and exciting about every iteration of this event because the topics are ever-evolving—serving to both reflect and shape the priorities of our profession.

At Kittelson, we’ve been attending TRB since our inception and offer it as an opportunity to both our experienced researchers and entry-level analysts. We place a high value on participation in transportation research, since it’s one of the biggest ways we can contribute to our profession while remaining aware of new guidance coming down the pipeline. From the Guide to Roundabouts to Roadway Cross-Section Reallocation: A Guide , we’ve gotten to see some big research projects of ours hit the streets in 2023 and are excited to share detailed findings at the upcoming Annual Meeting.

Kittelson is preparing to send a cohort of more than 50 team members to TRB 2024. Since many of them are seasoned TRB’ers, we polled that group for their predictions, insider tips, and facts you might not know about the Annual Meeting. Here’s what you need to know!

Read on for 24 insider tips, fun facts, and research topics and projects you'll want to learn about at the 2024 Annual Meeting!

History & Fun Facts

1. TRB used to be held at three different hotels where you needed to take a shuttle (or a 15-minute walk) to go from one session to another. Now, everything’s located at the Walter E. Washington Convention Center—which is great for planning out your day, but be sure to schedule some time outside (especially if you’re staying at the Marriot Marquis, which connects directly to the convention center!).

2. A cup of coffee cost about $0.05 on average in the 1920s, when the first Annual Meeting was held. Today, you can enjoy your latte in Compass Coffee inside the Walter E. Washington Convention Center for about 100x that amount – if you’re willing to brave the line!

3. TRB has more than 170 technical committees. Committee meetings are a great way to find out current “buzz”, they keep you up-to-date in your areas of interest, and they’re a great place make connections with people in other organizations who have similar interests to yours.

A committee meeting at TRB 2023.

Trending Topics

Based on our read of the Annual Meeting program, the following topics will be prominent in 2024, and for good reason! Read a bit about each, and a few of the many sessions where you can dive into these topics in detail.

4. Vulnerable road user safety. With US pedestrian deaths at a 40-year high, TRB 2024 will put the conversation of vulnerable road users (VRUs) front and center, building on prior research to dig into approaches to reduce pedestrian fatalities and injuries, how VRUs interact with people driving, and what it looks like to design and implement safe, healthy, and accessible pedestrian and bicyclist infrastructure.

• Workshop 1001: Pedestrian Safety on Urban Arterials
• Workshop 1002: Can You See Me?: Vulnerable Road User Conspicuity Research Plan
• Workshop 1028: At the Intersection of Disability Justice, Pedestrian Safety, and Health
• Workshop 5006: Mitigating the Implications of Increasing Vehicle Size and Mass on Pedestrian and Bicyclist Safety
• Workshop 5008: Building a Path to Better Active Transport: Understanding the Effects of Traffic Noise, Air Quality, and Vulnerable Road User Comfort on Users
• Lectern Session 3179: Walkability and Pedestrian Accessibility
• Poster Session 3214: Bicycle Safety, Planning, and Design: Research to Support Better Bicycling Conditions
• Poster Session 3159: Pedestrian Safety and Behavior
• Lectern Session 4049: Pedestrian Safety
• Lectern Session 2035: U.S. Department of Transportation Leadership in Innovation: Technology to Protect Vulnerable Road Users
• Lectern Session 2082: Addressing Road Safety Challenges in Developing Countries: Insight from a Multidisciplinary Perspective
• Poster Session 3039: Pedestrians, Bicyclist, and Driver Interactions

5. Integrating equity into all fields of transportation. Equity will continue to be a central theme, with the conversation moving from a generalized call-to-action to an examination of what equity practically looks like in various contexts.

• Workshop 1043:Equity, Access, and Safety in Traffic Signals
• Workshop 1044: Managed Lanes Rising: Technologies and Equity
• Workshop 1007: Integrating Equity into Transportation Safety Management
• Workshop 1048: Planning Process Trials for Equity: Designing and Role Playing a Planning Process for More Equitable Decision Making
• Lectern Session 2121: Equity in Bicycling and Micromobility
• Lectern Session 2131: Equity Considerations in Road Usage Charging
• Lectern Session 2198: Examining the Equity Impact of Transportation Policies and Practices
• Lectern Session 3028: Equitable Deployment of Electric Vehicles and Charging
• Lectern Session 3091: A Movement Towards Reparative Transportation and Community Building: Aftermath of Urban Freeway Planning, Locating and Construction
• Poster Session 3224: New Research in Transportation Equity
• Lectern Session 4021: Economics and Equity of Shared Mobility Services
• Lectern Session 4060: Got a Ride?: Evaluating Disparities in Car Ownership

6. The use of artificial intelligence (AI) and ChatGPT in the transportation industry. TRB will be a timely opportunity to exchange ideas and examples of the applications of AI in transportation, and discuss opportunities and cautions around the way it will impact how projects are carried out in the future.

• Workshop 1008: Shaping the Future: ChatGPT and Other Artificial Intelligence Technologies in the Transportation Industry
• Workshop 1020: The Use of Artificial Intelligence for Site Characterization and Pile Design
• Poster Session 3167: Safe and Smart Transportation Systems Powered by Artificial Intelligence
• Workshop 5013: Highway to Artificial Intelligence: Future-Proofing the Transport Sector

7. Standardization, management, and use of data for all roadway users. Sessions will highlight how data can be standardized to be usable across organizations, and shared across the profession, to manage and improve system operations.

• Workshop 1009: Breaking Down Organizational Silos with Data Standards
• Workshop 1010: Standardizing Transit Survey Data
• Workshop 1034: Breaking Down Data Silos Using the Mobility Data Interoperability Principles
• Workshop 1046: We Have a Tool for That: Tools to Analyze Local-, State-, and National-Level Transportation Trends
• Workshop 1003: Transportation Systems Management and Operations Data Exchanges: On-Ramps to the National Roadway Digital Infrastructure

8. Understanding and use of digital twin models. Digital twins enable the simulation and optimization of transportation infrastructure in real-time. TRB sessions will reflect and advance the growing conversation around the development and deployment of digital twins.

• Workshop 5005: Understanding Digital Twins for Transportation Systems Management
• Workshop 1047: Integrating Sensing and Advanced Computing Technologies into Digital Twin Models
• Lectern Session 2145: Practical Innovations for Maintenance Management Decision Making

Vulnerable road users, integrating equity into all transportation fields, artificial intelligence, data standardization, and digital twin models are just a few of the topics we expect to be prominent at the 2024 Annual Meeting.

New Research + Key Sessions

2023 was a year of major research publications. Here are a few you’re going to want to learn about at the 2024 Annual Meeting:

9. NCHRP Research Report 1043: Guide for Roundabouts . In June of this year, NCHRP released Research Report 1043: Guide for Roundabouts , which supersedes prior roundabout guides to become the nation’s go-to guide for the planning and design of roundabouts. While NCHRP Research Report 1043 continues the context-sensitive, performance-based design approach from these prior guides, it also includes a significant amount of new research and reorganization. Lee Rodegerdts , along with Brian Ray of Sunrise Transportation Strategies, LLC, will share what you need to know about the new guide at Lectern Session 3085 .

10. NCHRP Research Report 1087: Intersection Control Evaluation – A Guide. To bring consistency to Intersection Control Evaluation (ICE) policies and processes, a Kittelson team has been leading NCHRP Project 17-98 to develop a national ICE guide. This guide, which is planned to be published in early 2024, will present best practices and propose processes and tools for screening intersection alternatives and identifying an optimal solution. During Lectern Session 2072 , Pete Jenior will present an overview of NCHRP 17-98 findings, guidance, and tools for integrating ICE into your project development process.

11. Public Right-of-Way Accessibility Guidelines (PROWAG) . In August of this year, the United States Access Board issued the long-awaited final rule on PROWAG . PROWAG provides minimum accessibility guidelines for public rights-of-way that will become enforceable once they are adopted as mandatory standards by the U.S. Department of Justice and the U.S. Department of Transportation. PROWAG will be addressed at TRB during Lectern Session 3084 , and will be a relevant part of many other discussions throughout the Annual Meeting as well.

12. NCHRP Research Report 1036: Roadway Cross-Section Reallocation: A Guide . After being in pre-publication mode for the past year, NCHRP Research Report 1036 was published in Fall 2023. Acknowledging that every design decision comes down to tradeoffs, this first-of-its-kind guide provides a framework for engineers, planners, and decision-makers to assess those tradeoffs and ultimately, articulate the priorities behind design decisions. At TRB, you can learn about the cross-section guide at Lectern Session 2123 and Poster Session 3163 .

13. NCHRP Research Report 1038: Update of Highway Capacity Manual: Merge, Diverge, and Weaving Methodologies. This report will be a major voting item at the Highway Capacity Committee & Quality of Service Committee meeting . If adopted, it will be the first time the Highway Capacity Manual merge/diverge method has changed in 40 years!

14. Integration of New Traffic Signal Actuation Concepts using Enhanced Detector Information. Vehicle trajectory data is becoming increasingly available for signal control applications, but few previous studies have explored the use of this data for more efficient actuated control on arterials. The Iowa Department of Transportation is leading a Pooled Fund Study to develop field-tested methods of integrating vehicle trajectory data into actuated signal control that can be directly implemented in traffic signal controllers. They’ll share what they’re learning at Poster Session 2232 .

15. Evaluating The Reliability of Automatically Generated Pedestrian and Bicycle Crash Surrogates. Collecting accurate pedestrian and bicycle volumes is difficult, and relying exclusively on crash data means waiting for crashes—and the resulting injuries and fatalities—to happen before taking preventative action. A study from the Pennsylvania Department of Transportation set out to learn if video analytics can predict conflicts as reliably as human review to be able to select and evaluate countermeasures. They’ll share findings from that study and additional research to assess the reliability of automatically generated surrogates in predicting confirmed conflicts using data-driven models at Poster Session 4070 .

16. Every year, TRB includes a career fair . The Careers in Motion Networking Fair will be held on the first day of the Annual Meeting (Sunday, January 7). Find Kittelson at booth B613: we welcome the opportunity to meet students and emerging professionals!

Kittelson's Megan Nelson and Shannon Warchol discuss Shannon's research presentation at the 2023 Annual Meeting.

Insider Tips

If you’ve been to a TRB Annual Meeting, you know it can be a whirlwind, and the time you spend preparing is well worth it. Here’s some advice from our team about maximizing your experience at the Annual Meeting:

17. Biking from the airport to the Convention Center is easy and fun — here’s our tried-and-true route ! The WMATA Yellow Line is also open again, so you have several options for making the trip without needing a cab or ride-hail app vehicle. (Don’t just go off the travel time provided to you on your phone app—it includes walk time to the train while the ride hail directions do not, even though the two departures are right next to each other in the airport!)

18. The west side of the Convention Center is usually less crowded and is an excellent place to hide away for an hour or two when either you or your computer needs to recharge.

19. As mentioned above, the coffee line is long , and the restaurants right around the venue also get crowded quickly. If you want to branch out from your usual lunch or coffee spot, our Washington, D.C. team has got you covered with this map of local picks for places to eat, caffeinate, socialize, and exercise near the convention center. A 10-minute walk always beats a 10-minute wait!

Kittelson's Washington, D.C. team has put together a map of local places to eat, caffeinate, socialize, and exercise near the Walter E. Washington Convention Center.

20. Plan which sessions/meetings you want to attend in advance! There are so many concurrent options, so don’t put the pressure on yourself to choose in the moment. And it’s never too early to schedule coffee or lunch with people you want to connect with at TRB. Everyone at TRB will have a full schedule, and it will likely be hard to find time to meet if you wait until January to start planning those one-on-one meetings. (If this will be your first time at TRB, you can read additional tips on our website for navigating the large conference and making the most of your time there.)

21. Download the TRB Annual Meeting app for quick access to the program. This makes it much easier to pivot in the moment if you decide you want to attend a different session. (It’s a good idea to have one or two backups in mind for every session you plan to attend!)

22. Poster sessions are one of the best places for networking. While committee meetings, lecterns, and workshops are all fantastic places to gather knowledge, poster sessions are great for interactions. Put a few poster sessions on your calendar and take the time to peruse the many fascinating topics and learn from the people who created the posters—it’s a great way to make new connections.

Nemanja Dobrota presents a poster at the 2023 Annual Meeting.

23. Dress for cold weather. The weather could be 70 degrees and sunny, or there could be a foot of snow on the ground. But dress for cold weather either way, even if the forecast looks mild. Wind speeds can be pretty brutal around downtown Washington, D.C.!

24. On that note, there’s a lot that can be learned outside the conference. You can rent a bike from Capital Bikeshare and tour DC’s protected bike lanes or just walk near the convention center to see some interesting quick-build treatments. And if you’re feeling ambitious, a morning run to and around the National Mall is an annual TRB tradition for many. Be sure to get outside!

A ride around D.C.'s protected biking facilities has become an unofficial Kittelson TRB tradition!

If you’ll be at TRB, we want to connect with you! Here is our presentation schedule . As with last year, we’re also offering the opportunity to set up a meeting with a Kittelson team member if you’d like to talk about working at Kittelson. Please fill out this form and we’ll get back to you to set up a time.

More References

Publications.

NCHRP Research Report 1043 . Guide for Roundabouts  

NCHRP Synthesis 488. Roundabout Practices  

NCHRP Research Report 948. Guide for Pedestrian and Bicyclist Safety at Alternative and Other Intersections and Interchanges  

From all over the world

https://novascotia.ca/tran/roundabout/roundabout.asp