The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Tabular and text data from fewer than 50 respondents were collected. The survey data was then exported from Qualtrics in CSV format. Forty-nine survey responses were then recorded in an Excel Spreadsheet, as Excel is a readily accessible file format for most users. The file size is 40 KB of data. No information about the respondents' names were inc
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This study develops guidance for public transit agencies in Los Angeles, California to better prepare for hazards and address challenges, including climate and safety concerns. Using a community-based participatory research methodology in partnership with the local non-profit organization Climate Resolve, we conducted three listening sessions with
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This study presents a comprehensive tool to accurately predict the remaining fatigue life of full-span overhead highway sign support structures subjected to a long and sustained wind fluctuation. Synthetic wind time-histories were developed by superimposing cosine waves over frequencies of 3–300 Hz and randomly generated phase angles. The Kaimal sp
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This report describes the evaluation of a proposed approach to incorporate structural condition information obtained from a traffic speed deflection device into the Virginia Department of Transportation (VDOT) pavement management system’s pavement treatment selection process for asphalt pavement sections, which are denoted within the VDOT pavement
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Superelevated highway transitions experience an area of zero-cross slope as one side of the roadway transitions from a normal crown cross slope to superelevation. These areas of minimal transverse cross slope combined with minimal longitudinal grade can cause an increase in water accumulation on highways, which can increase the likelihood for hydro
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In some instances, steel bridges can contain gaps between steel plates in bolted connections or between steel and concrete surfaces. In new bridges, these gaps may result from fabrication or assembly errors. In existing structures, the gaps often arise because of corrosion-related section loss. These gaps can also cause durability concerns because
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The construction of embankments and other infrastructure elements over saturated, compressible, cohesive soft soils in Louisiana presents significant geotechnical design challenges due to anticipated large magnitudes of consolidation settlement and slow rates of consolidation. Inaccurate estimation of these deformations can lead to significant diff
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This study used finite element shape functions to conduct spatial interpolation of wind-speed records for all Kansas counties (Al Shboul et al., 2023). This method considered spatial correlations among boundary sites. Artificial wind-time histories were constructed for each day for the entire 45-year study period, and the number of cycles developed
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During the past two decades, the implementation of pavement recycling techniques, such as cold central plant recycling and full-depth reclamation, for pavement rehabilitation and construction in the United States has been driven by positive performance and the opportunity for significant cost and environmental savings. However, these recycling tech
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2025-10-01
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This Research Note briefly summarizes seat belt use in 2024. The national estimate of seat belt use by adult front-seat passengers of passenger vehicles in 2024 was 91.2 percent, nearly the same as the 91.9 percent observed in 2023. The seat belt use rate estimate represents the percentage of occupants who are belted during an average daylight mome
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This volume is the first in a series. The other volume in the series is FHWA-GA-25-2217 Volume II. As Mechanically Stabilized Earth and Modular Block retaining walls age within Georgia's highway infrastructure, their stability and safety are critical concerns. Currently, unlike bridges, these retaining walls lack standardized inspection protocols,
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As transportation agencies transition toward more data-driven and collaborative project delivery, the Georgia Department of Transportation (GDOT) has initiated a strategic effort to define and implement digital delivery. This research develops a comprehensive roadmap for GDOT based on an integrated methodology that combines internal interviews, a s
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This report evaluates the effectiveness of electronic stability control (ESC) in mitigating single-vehicle, first-event rollover crashes. NHTSA mandated ESC standard equipment in certain light vehicles manufactured on or after September 1, 2011, by Federal Motor Vehicle Safety Standard (FMVSS) No.126, Electronic stability control systems. The study
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Wildlife-vehicle collisions (WVCs) pose serious risks to motorist safety and contribute significantly to wildlife mortality. Wildlife fencing serves as a proven countermeasure to mitigate WVCs while promoting habitat connectivity. This study evaluates the safety effectiveness of wildlife fencing installed across Utah from 2011 to 2023, using traffi
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The selection of ground motions for time series analysis of structures remains a topic of considerable debate. While both time domain method and spectral matching are permitted by the Caltrans Seismic Design Criteria (SDC), the implications of the choice are not fully understood. To explore and compare how these different modification methodologies
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Curving resistance affects the railway vehicle running through curves. For its estimation in train dynamics calculations, different empirical formulas are used in various countries. It is practically impossible to determine its exact value because of its dependency on various – to some extent random – parameters. In the framework of the experimenta
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The Arizona Department of Transportation (ADOT) is working to modernize its financial tracking systems to improve transparency, compliance, and efficiency in managing federally funded transportation projects. Existing tools, including the Resource Administration database and related systems, operate independently, and require extensive manual data
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A proprietary magnesium-alumino-liquid-phosphate (MALP) concrete, manufactured by Phoscrete Corporation, is a rapid-setting repair material promoted for its ability to bond with portland cement concrete and protect reinforcing steel against corrosion. A related product, magnesium-potassium-phosphate (MKP) concrete, offers slower setting for easier
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A report by Portland State University (PSU) researchers offers an improved framework for assessing the seismic risk of transportation structures. Earthquake preparedness is a high priority for the Pacific Northwest, and cities and state agencies will benefit from having a more accurate and consistent way to prepare.
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