Section 106 of the National Historic Preservation Act requires federal agencies, including the U.S. Federal Highway Administration, to take into account the effects of their programs and projects listed in or eligible for listing in the National Register of Historic Places.
NCHRP Research Report 1133: Preparing Successful No-Effect and No-Adverse-Effect Section 106 Determinations: A Handbook for Transportation Cultural Resource Practitioners, from TRB’s National Cooperative Highway Research Program, is designed to aid in the navigation of both the Section 106 and project development processes and address other various practitioner challenges.
Supplemental to the report are NCHRP Web-Only Document 412: Creating a Handbook for Successful No-Effect and No-Adverse-Effect Section 106 Determinations, a technical memorandum on implementation of the research findings and products, and a PowerPoint presentation on the study.
102 pages
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8.5 x 11
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paperback
ISBN Paperback: 0-309-73387-1
ISBN Ebook: 0-309-73388-X
DOI:
https://doi.org/10.17226/28911
National Academies of Sciences, Engineering, and Medicine. 2025. Preparing Successful No-Effect and No-Adverse-Effect Section 106 Determinations: A Handbook for Transportation Cultural Resource Practitioners. Washington, DC: The National Academies Press.
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Dial-a-ride and fixed-route transit options are some of the ways that microtransit services have traditionally been implemented in rural areas. App-based booking and dynamic routing are among the newer offerings transit agencies are exploring to provide greater flexibility and more spontaneous options for users.
TCRP Synthesis 178: Microtransit Solutions in Rural Communities: On-Demand Alternatives to Dial-a-Ride Services and Unproductive Coverage Routes, from TRB's Transit Cooperative Research Program, provides a comprehensive overview of rural microtransit operations through a literature review, surveys of 19 transit providers, and case examples of seven agencies. High customer satisfaction and improved service efficiency were frequently cited as benefits of microtransit solutions.
100 pages
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paperback
ISBN Paperback: 0-309-99179-X
ISBN Ebook: 0-309-99180-3
DOI:
https://doi.org/10.17226/29085
National Academies of Sciences, Engineering, and Medicine. 2025. Microtransit Solutions in Rural Communities: On-Demand Alternatives to Dial-a-Ride Services and Unproductive Coverage Routes. Washington, DC: The National Academies Press.
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Run-off-road traffic crashes account for almost one third of the deaths and serious injuries each year on U.S. highways. The effective design of roadsides, including the placement of roadside safety devices, can reduce the frequency and/or severity of these crashes but requires an understanding of the nature and frequency of roadside encroachments.
NCHRP Web-Only Document 427: Roadside Encroachment Database and Analysis, from TRB's National Cooperative Highway Research Program, details a plan to develop a database that can be used to evaluate the effects of characteristics of the nature and frequency of roadside encroachments and associated crashrelated factors.
The project deliverables include an excel database and a coding manual among other documents.
460 pages
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8.5 x 11
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ISBN Ebook: 0-309-99247-8
DOI:
https://doi.org/10.17226/29123
National Academies of Sciences, Engineering, and Medicine. 2025. Roadside Encroachment Database and Analysis. Washington, DC: The National Academies Press.
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Aquatic organism passage (AOP) water crossing design is an evolving field at the nexus of the built environment and the natural world. When successful, AOP water crossings provide sustainable transportation infrastructure and environmental benefits via connected habitats for fish and other aquatic organisms.
NCHRP Synthesis 646: Design, Construction, and Monitoring Practices for Aquatic Organism Passage, from TRB's National Cooperative Highway Research Program, documents current practices of state departments of transportation in the design, construction, and monitoring of AOP water crossing structures.
110 pages
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paperback
ISBN Paperback: 0-309-73479-7
ISBN Ebook: 0-309-73480-0
DOI:
https://doi.org/10.17226/29054
National Academies of Sciences, Engineering, and Medicine. 2025. Design, Construction, and Monitoring Practices for Aquatic Organism Passage. Washington, DC: The National Academies Press.
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Airport parking is an important customer amenity and a principal source of revenue that helps fund the operation and development of airports. In recent years, growing volumes of passenger traffic and increasing competition from a variety of airport access providers have encouraged airports to seek new ways to attract airport parkers and enhance revenues, which may include implementing an online booking system.
ACRP Synthesis 140: Airport Parking Reservation Systems and Techniques, from TRB's Airport Cooperative Research Program, documents the use of online booking systems at U.S. airports, including their benefits, costs, and implementation challenges.
60 pages
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paperback
ISBN Paperback: 0-309-73407-X
ISBN Ebook: 0-309-73408-8
DOI:
https://doi.org/10.17226/29030
National Academies of Sciences, Engineering, and Medicine. 2025. Airport Parking Reservation Systems and Techniques. Washington, DC: The National Academies Press.
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Work zones may present imminent safety hazards for roadway workers as well as passing motorists due to several factors, including driver distraction, changes in traffic patterns, narrowed rights of way, and general congestion. In addition to safety concerns, work zones, although necessary for roadway construction and maintenance activities, present mobility issues and frustrations for traveling motorists, accounting for 10 percent of overall congestion and 24 percent of unexpected freeway delays.
NCHRP Research Report 1142: Innovative Approaches to Enhancing Safety and Efficiency in Work Zones: A Guide, from TRB's National Cooperative Highway Research Program, provides an overview of use cases in Smart Work Zone (SWZ) technology, emerging technologies in each of the use cases, pros and cons of SWZ technologies, best practices for emerging technologies in SWZs, and additional resources to support efforts in improving work zone safety and mobility. Supplemental to the report are a technical memorandum on implementation of the research findings and products; a PowerPoint presentation on the study; and NCHRP Web-Only Document 418: Modern Solutions to Safe and Efficient Work Zone Travel.
48 pages
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paperback
ISBN Paperback: 0-309-73324-3
ISBN Ebook: 0-309-73325-1
DOI:
https://doi.org/10.17226/28850
National Academies of Sciences, Engineering, and Medicine. 2025. Innovative Approaches to Enhancing Safety and Efficiency in Work Zones: A Guide. Washington, DC: The National Academies Press.
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Eight-hundred fifty-seven fatalities occurred in work zones in the United States in 2020. One work zone fatality occurs for every 4 billion vehicle miles of travel and for every $112 million of roadway construction expenditures.
NCHRP Web-Only Document 418: Modern Solutions to Safe and Efficient Work Zone Travel, from TRB's National Cooperative Highway Research Program, is supplemental to NCHRP Research Report 1142: Innovative Approaches to Enhancing Safety and Efficiency in Work Zones: A Guide and seeks to identify best practices in leveraging technology to help the traveling public navigate roadway maintenance or construction work zones.
127 pages
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ISBN Ebook: 0-309-09933-1
DOI:
https://doi.org/10.17226/29097
National Academies of Sciences, Engineering, and Medicine. 2025. Modern Solutions to Safe and Efficient Work Zone Travel. Washington, DC: The National Academies Press.
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The Transportation Emergency Response Application (TERA) is a scenario-based training system that provides training and exercise scenarios and materials for command-level and operational roles in public transportation agencies, state departments of transportation, and airport emergency operations centers for natural and human-made disaster incidents.
TCRP Research Report 253: Transportation Emergency Response Application (TERA): Migration Options Beyond 2025, from TRB's Transit Cooperative Research Program, identifies migration and repurpose options for the content of TERA to one or more platforms and describes materials that have the most value as resources for tabletop exercises.
48 pages
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paperback
ISBN Paperback: 0-309-73555-6
ISBN Ebook: 0-309-73556-4
DOI:
https://doi.org/10.17226/29074
National Academies of Sciences, Engineering, and Medicine. 2025. Transportation Emergency Response Application (TERA): Migration Options Beyond 2025. Washington, DC: The National Academies Press.
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U.S. airports that receive assistance from the federal government are required to comply with a number of obligations imposed by federal law.
The TRB Airport Cooperative Research Program's ACRP Web-Only Document 65: DOT and FAA Airport Legal Determination and Opinion Letter Abstracts of 2023 covers case-specific guidance from U.S. DOT or FAA on various federal airport compliance matters released since the previous update to ACRP Legal Research Digest 21.
This document is supplemental to ACRP Legal Research Digest 21: Compilation of DOT and FAA Airport Legal Determinations and Opinion Letters as of December 31, 2023, which contains agency determinations covering administrative cases brought against large and small airports throughout the United States, as well as DOT and FAA opinion letters, memoranda, and related documents. These documents cover legal matters that include reasonableness of contractual terms, leasing practices, airport rules and regulations, airport charges imposed on aeronautical users, including airlines, and the standards for determining airport sponsor compliance with other federal obligations.
47 pages
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8.5 x 11
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ISBN Ebook: 0-309-73306-5
DOI:
https://doi.org/10.17226/28856
National Academies of Sciences, Engineering, and Medicine. 2025. DOT and FAA Airport Legal Determination and Opinion Letter Abstracts of 2023. Washington, DC: The National Academies Press.
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Motor vehicle crash rates for teen drivers during the learner's permit phase are relatively low and comparable to those of adult drivers. However, once teenagers begin driving independently, the crash risk increases significantly at licensure and remains high during the first few months of solo driving.
BTSCRP Research Report 13: Outcomes of Variability in Teen Driving Experience and Exposure: Evidence from Naturalistic Driving Studies, from TRB's Behavioral Traffic Safety Cooperative Research Program, provides insights on how exposure to driving during the learner's permit period and the first months of driving independently, including driving in diverse environments, impacts safety outcomes in later driving.
60 pages
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paperback
ISBN Paperback: 0-309-72312-4
ISBN Ebook: 0-309-72313-2
DOI:
https://doi.org/10.17226/29066
National Academies of Sciences, Engineering, and Medicine. 2025. Outcomes of Variability in Teen Driving Experience and Exposure: Evidence from Naturalistic Driving Studies. Washington, DC: The National Academies Press.
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There is widespread material degradation that affects all components of bridges, often limiting their service lives. For reinforced concrete bridge members, that deterioration is predominately caused by corrosion of the internal steel reinforcement.
NCHRP Synthesis 641: State DOT Policies and Practices on the Use of Corrosion-Resistant Reinforcing Bars, from TRB's National Cooperative Highway Research Program, documents the policies and practices of state departments of transportation related to their use of corrosion-resistant reinforcing bars.
186 pages
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paperback
ISBN Paperback: 0-309-73449-5
ISBN Ebook: 0-309-73450-9
DOI:
https://doi.org/10.17226/29045
National Academies of Sciences, Engineering, and Medicine. 2025. State DOT Policies and Practices on the Use of Corrosion-Resistant Reinforcing Bars. Washington, DC: The National Academies Press.
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The repair of transverse cracks and longitudinal paving joints and cracks in asphalt and asphalt-surfaced pavements is a common maintenance activity for state departments of transportation (DOTs). One of the limitations of crack sealing and filling, however, is the width of the crack for which these repairs are successful.
NCHRP Synthesis 640: Wide Cracks and Joints in Flexible and Composite Pavements: State DOT Maintenance Practices, from TRB's National Cooperative Highway Research Program, documents practices used by state DOTs for flexible and composite pavement maintenance for wide transverse and longitudinal cracks and joints.
138 pages
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paperback
ISBN Paperback: 0-309-73427-4
ISBN Ebook: 0-309-73428-2
DOI:
https://doi.org/10.17226/29035
National Academies of Sciences, Engineering, and Medicine. 2025. Wide Cracks and Joints in Flexible and Composite Pavements: State DOT Maintenance Practices. Washington, DC: The National Academies Press.
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The transportation industry is working toward a common understanding of integrating transportation resilience into various agency processes and exploring new methods for evaluating resilience investments.
Transportation Insights 5: Transportation Resilience 2023 presents the discussions and presentations from an international conference hosted by TRB in November 2023 in Washington, DC.
86 pages
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ISBN Ebook: 0-309-73314-6
DOI:
https://doi.org/10.17226/28858
National Academies of Sciences, Engineering, and Medicine. 2025. Transportation Resilience 2023: International Conference on Extreme Weather and Climate Change Challenges. Washington, DC: The National Academies Press.
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Bridge construction inspection is a critical component in fulfilling the mission of state departments of transportation (DOTs) and the U.S. Federal Highway Administration to deliver high-performing transportation systems that adhere to or surpass specified quality standards.
NCHRP Synthesis 649: Bridge Construction Inspection Training: Resources and Practices, from TRB's National Cooperative Highway Research Program, collects resources and documents practices used by state DOTs in training and setting qualifications of the bridge construction inspection workforce.
156 pages
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paperback
ISBN Paperback: 0-309-73411-8
ISBN Ebook: 0-309-73412-6
DOI:
https://doi.org/10.17226/29031
National Academies of Sciences, Engineering, and Medicine. 2025. Bridge Construction Inspection Training Resources and Practices. Washington, DC: The National Academies Press.
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Off-ramp barriers are typically tested in straight, level conditions. However, real-world installations are often on curves with superelevation. This can affect how well they perform in crashes, especially when transitioning between highways and ramps.
NCHRP Research Report 1138: Evaluating the Performance of Longitudinal Barriers on Curved, Superelevated Off-Ramps, from TRB's National Cooperative Highway Research Program, aims to gain additional insights and establish guidelines relative to the crash performance of longitudinal barriers when placed on varying curved, superelevated ramp sections.
102 pages
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paperback
ISBN Paperback: 0-309-73155-0
ISBN Ebook: 0-309-73183-6
DOI:
https://doi.org/10.17226/28589
National Academies of Sciences, Engineering, and Medicine. 2025. Evaluating the Performance of Longitudinal Barriers on Curved, Superelevated Off-Ramps. Washington, DC: The National Academies Press.
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NCHRP Web-Only Document 417: Background and Resources for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements, from TRB's National Cooperative Highway Research Program, is a supplement to NCHRP Research Report 1139: Considerations for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements.
106 pages
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ISBN Ebook: 0-309-73416-9
DOI:
https://doi.org/10.17226/29032
National Academies of Sciences, Engineering, and Medicine. 2025. Background and Resources for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements. Washington, DC: The National Academies Press.
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Grouted tendons are predominantly used for post-tensioned concrete bridge elements in the United States. However, because of potential durability issues with grouted tendons, some highway agencies have opted to use ungrouted tendons for post-tensioning to facilitate replacement.
NCHRP Research Report 1139: Considerations for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements, from TRB's National Cooperative Highway Research Program, provides information on the different aspects of the design and construction of post-tensioned concrete bridge elements with unbonded tendons or a combination of bonded and unbonded tendons.
Supplemental to the report is NCHRP Web-Only Document 417: Background and Resources for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements.
158 pages
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paperback
ISBN Paperback: 0-309-73419-3
ISBN Ebook: 0-309-73420-7
DOI:
https://doi.org/10.17226/29033
National Academies of Sciences, Engineering, and Medicine. 2025. Considerations for the Design and Construction of Bonded and Unbonded Post-Tensioned Concrete Bridge Elements. Washington, DC: The National Academies Press.
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Most airports, whether they realize it or not, use geospatial data. Traditionally, spatial data has been documented on paper to identify airport assets; as technology has progressed, information on spatial data has become more accurate. Today, geospatial software systems, such as geographic information systems, computer-aided design, and building information modeling, make acquiring and maintaining geospatial data easier.
ACRP Research Report 278: Geospatial Data Governance Policies and Procedures: A Guide, from TRB's Airport Cooperative Research Program, provides guidance to airport operators on how to create a data governance strategy for airports and stakeholders, including roles and responsibilities, policies, data collection standards, procedures, data exchange, security, and maintenance.
150 pages
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8.5 x 11
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paperback
ISBN Paperback: 0-309-73309-X
ISBN Ebook: 0-309-73310-3
DOI:
https://doi.org/10.17226/28857
National Academies of Sciences, Engineering, and Medicine. 2025. Geospatial Data Governance Policies and Procedures: A Guide. Washington, DC: The National Academies Press.
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