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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Start thinking about the deserving colleagues or mentors for TRB's most prestigious awards honoring excellence in leadership, service, and management. Details for nominations are on each award's homepage and nominations will be accepted June 1 - July 31 for:
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The National Academy of Engineering announced that Tsu-Jae King Liu has been appointed president starting July 1. Liu is most recognized as the co-inventor of FinFET, the transistor design that powers the microprocessors in nearly every modern smartphone and computer.
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| May Spotlight: Roundabouts |
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Roundabouts are being studied in several states across the U.S., as detailed in TRB's 2025 report NCHRP Synthesis 639: Implementation of Federal Highway Administration Proven Safety Countermeasures.
A study by the Georgia Institute of Technology evaluated safety impacts at 23 locations in the state converted from stop-controlled to roundabouts and found a 37–48% reduction in average crash frequency for all crashes and a 51–60% reduction in crash frequency for injury and fatal crashes. Carmel, Indiana—often referred to as the Roundabout City—compared crash data 2 years before and 2 years after the installation of both single- and double-lane roundabouts. Injury crashes were reduced by 47% overall.
Several state departments of transportation refer to the latest design guidance provided in a 2023 collaboration between TRB, the American Association of State Highway and Transportation Officials, and the Federal Highway Administration: NCHRP Research Report 1043: Guide for Roundabouts. These include the Colorado DOT, the Florida DOT, the Kentucky Transportation Cabinet, the Maryland State Highway Administration, and the Ohio DOT. According to Colorado DOT’s Roadway Design Guide, all roundabouts designed at intersections along the state highway system must be developed and evaluated in accordance with the NCHRP guide. (Photo of roundabout in Carmel, IN courtesy of Airbus, Maxar Technologies, Google.)
Register today for TRB's International Conference on Roundabouts and Geometric Design held June 8 - 12 in Atlanta, GA. Discuss successes and what's next for innovative intersections from Japan to Texas. Representatives of state DOTs, academic researchers, industry consultants, and more will lead panels and conversations.
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 Have you had a chance to check out the new look and format for TRB's quarterly magazine TR News? Issue 353 (Spring 2025), the first all-digital issue, is available online!
TR News has a new website, a mobile-friendly design, and useful features such as archival article searches by topic and author.
In this issue, explore articles on new design guidelines for right turns on red, safety evaluation of on-street bicycle facility design, measuring demand on Central Pennsylvania walking and bike paths, and much more. And don’t miss highlights from the 104th TRB Annual Meeting.
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May 15 – TRB Webinar: Developing Statewide Comprehensive Transit Information Systems
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May 27 – TRB Webinar: Envisioning the Future of U.S. Airports
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At TRB's Future of the Transportation Workforce conference, you will see in-depth projects on retention, training and development, closing knowledge gaps, preventing turnover, barriers to employment, and more. Register to join Sebastian Ruiz, Larry Williams, Garrett Wheat, Virginia Stubella, and Dorris Lance (l-r pictured above) June 2 - 4 in Westminster, CO.
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The Airport Cooperative Research Program's Graduate Research Awards highlight applied research on airport and related aviation system issues to help the public sector continue to improve the quality, reliability, safety, and security of the U.S. civil aviation system. Submit an application by May 30 for a chance at a $12,00 stipend, access to a panel of experts, an opportunity to present at the TRB Annual Meeting, and more!
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Highway professionals often face challenges despite available solutions due to fragmented or unevaluated information. TRB’s National Cooperative Highway Research Program's synthesis program collects, evaluates, and disseminates this knowledge to support informed decision-making across the highway community. Employees of state departments of transportation, AASHTO staff on behalf of AASHTO committees or councils, and employees of the Federal Highway Administration can submit their problem statements for possible future NCHRP synthesis projects by June 2.
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If you completed the requirements for a Ph.D. or Sc.D. or will by this fall and have already successfully tackled a major scientific or engineering problem during your thesis work, apply for an Army Research Laboratory (ARL) Distinguished Postdoctoral Fellowship. Recipients pursue independent research of their choosing that supports the mission of ARL. This work includes extreme materials, cyber and network sciences, energy sciences, and mechanical sciences for uncrewed ground and air vehicles. Apply by July 10.
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