Status of Roundabouts in North America
CLICK HERE TO VIEW PRESENTATION PDF |
Lee Rodegerdts
Principal Engineer
Kittelson & Associates, Inc.
Lee Rodegerdts is a Principal Engineer with Kittelson & Associates, Inc. in their Portland, Oregon office, licensed as a Professional Engineer in sixteen states. He has 29 years of experience in traffic operations, traffic design, transportation planning, and transportation research and education. He is recognized internationally for his expertise on roundabouts and has contributed to much of the national and state-level research in use today. He led a worldwide team of experts to develop NCHRP Report 672, Roundabouts: An Informational Guide, 2nd edition, after serving on the team that developed the first edition for FHWA. He has also guided many intersection and roundabout projects through planning, analysis, and design, serving as the engineer in responsible charge for many aspects. He is a founding member of the National Committee on Uniform Traffic Control Devices’ Roundabout Joint Task Force and has actively contributed content to the MUTCD. Lee previously served as a founding member of TRB's Committee on Roundabouts and Other Intersection Design and Control Strategies, and he led the development of the roundabout chapters for the Highway Capacity Manual's three most recent editions.
PRESENTATION DESCRIPTION |
This poster presents a summary of current trends in roundabout implementation in the United States and Canada. It will be based on a snapshot summary of the online roundabout database maintained and curated for the TRB Roundabout Committee at roundabouts.kittelson.com. Trends include the number of roundabouts, their geographic diversity, year of implementation, type of roundabout (e.g., single-lane, multilane), and other parameters. The poster is highly graphical, with a series of maps that show the progression of roundabouts over a series of years, as well as a series of bar and pie charts showing growth patterns and characteristics. This poster builds on a series that has been presented at each of the previous roundabout conferences, serving as a continuing snapshot of roundabout progress in North America. Similar to each of the past roundabout conference posters, the poster include data through the most recent full year (2021), with an analysis of the database to estimate unknown sites that have not yet been recorded in the database.
LEARNING OBJECTIVES |
Learning objective 1: To share the growth trends in roundabouts across North America.
Learning objective 2: To provide objective data to support studies, articles, and conversations about roundabouts.
Target Audience: All conference attendees, as well as for non-attending practitioners and other interested parties (news organizations, etc.) who may use the poster as a reference.
ROUNDABOUT DISCUSSION |
This continues a series of posters presented at each roundabout conference to document the progress of roundabouts over the past 32 years. It is based on what is widely considered to be the most comprehensive database of roundabouts in North America and thus is as objective as possible. Importantly, it updates previous posters based on the latest known information.