Cooperative Research Programs Series
Periodicals and Other Documents
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TRB Weekly
TRB Weekly is a free weekly email newsletter designed to keep you up-to-date on TRB activities and to highlight select transportation research-related activities taking place at the federal and state levels, and within the academic and international transportation communities. Subscribe to have the latest version delivered to your inbox.
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Send comments or questions about TRB Weekly to trbnews@nas.edu. TRB highlights external reports and publications that are available online
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Select from the list below to view this year and last year's TRB Weekly.
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TRB Weekly covers the latest in transportation research.
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| May Spotlight: Roundabouts |
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"Circular junctions" were introduced as a road-design method in the late 1700s in the U.K., France, and then in Washington D.C. However, those were considerably different than what has become the modern roundabout. Roundabout implementation has accelerated over the last 30 years in the U.S.
In 1998, TRB's NCHRP Synthesis of Highway Practice 264: Modern Roundabout Practice in the United States, identified 50 known roundabouts in the country. By 2016, TRB's NCHRP Synthesis of Highway Practice 488: Roundabout Practices, tallied the number at an estimated 3,200 roundabouts. A crowdsourced online roundabout database presented at TRB's 2022 roundabouts conference claimed an estimate, through 2021, of at least 8,800 roundabouts in the U.S. Learn more about current research and notworthy practices June 8 - 12 at TRB's Conference on Roundabouts and Geometric Design in Atlanta, GA.
It's safe to say roundabouts are a phenomenon in the roadway-engineer and traffic-planning communities. With that spirit, TRB and the National Academies have compiled this Roundabouts Collection to help guide implementation of the practice on the ground. (Photo credit: Kittelson & Associates, Inc.)
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Dial-a-ride and fixed-route transit options are some of the ways that microtransit services have been traditionally implemented in rural areas. App-based booking and dynamic routing are among the newer offerings transit agencies are exploring to potentially provide greater flexible and spontaneous options for users.
TCRP Synthesis 178: Microtransit Solutions in Rural Communities: On-Demand Alternatives to Dial-a-Ride Services and Unproductive Coverage Routes, was released this past week by TRB's Transit Cooperative Research Program. The publication provides a comprehensive overview of rural microtransit operations through a literature review, surveys of 19 transit providers, and case studies of seven agencies. High customer satisfaction and improved service efficiency were cited frequently among the benefits of microtransit solutions.
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NCHRP Research Report 1133: Preparing Successful No-Effect and No-Adverse-Effect Section 106 Determinations: A Handbook for Transportation Cultural Resource Practitioners
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TRB's Top Downloaded Publication in April: NCHRP Research Report 1152: Leveraging Artificial Intelligence and Big Data to Enhance Safety Analysis: A Guide (released April 9, 2025)
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May 8 – TRB Webinar: Navigating Current and Future Freight Challenges
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May 15 – TRB Webinar: Developing Statewide Comprehensive Transit Information Systems
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If you are a graduate or undergraduate student in the U.S., submit your design to TRB's Airport Cooperative Research Program University Design Competition this week! Winning innovative design teams earn cash prizes for solutions on airport safety, operations, maintenance, passenger experience, terminal design, environmental interactions, or management and planning. Submissions due May 9.
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