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.
The objective of this study is to investigate the cracking of concrete bridge decks employing internal curing. Concrete mixtures incorporating internal curing, used in conjunction with slag cement with or without small amounts of silica fume (as partial replacements of portland cement), are investigated based on construction observations and crack
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In this study, the S&T research team conducted comprehensive data analysis from the Asphalt Mixture Performance Tester (AMPT) samples collected in the Highway 54 and MO 740 projects. The MO 740 project in Boone County contained test sections with five mix designs, i.e., control mix, ground tire rubber (GTR)-modified mixture, and three mixtures cont
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This report represents a continuation of analysis concerned with the patterns and methods of distributing grains and oilseeds from North Dakota. This series began with the analysis of 1956-57 data and was published in Agricultural Economics Reports 15, 17, 44, 56, and 86 and Agricultural Experiment Station Bulletin 462. The compilation and analysis
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The objective of this report is to provide a benchmark for elevator managers in assessing performance and supply a source for recognizing trends in the characteristics of North Dakota elevators. This report and the statistics mailed to individual elevators are presented as a source of information for elevator managers and those interested in the No
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To demonstrate the value of research and its implementation, the Governor’s Office initially requested an annual financial analysis of the INDOT Research Program to determine the return on the research investment (ROI). The INDOT Research & Development (R&D) has continued to publish an annual Return on Investment report. The current financial analy
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The goal of Utah’s Safe Routes to School program is to “help children get to and from school safely” (UDOT, 2022). To that end, state law dictates that each school must maintain a safe routes map showing students the safest route to access the school from their homes. This research examined existing safe routes maps and investigated whether schools
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Preble’s meadow jumping mice (PMJM) are rare rodents found along creeks and waterways from southeastern Wyoming to Colorado Springs. In Colorado, PMJM are found in densely vegetation riparian corridors and wetlands along the Front Range. The biggest threat to populations is habitat conversion and alteration. Habitat regeneration and rehabilitation
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The objective of this study is to accurately predict the creep and shrinkage behavior of concrete in the I-59/I-20 segmental bridge located in downtown Birmingham, Alabama. Concrete samples were collected on four sampling dates throughout the bridge’s construction for creep and shrinkage testing. Concrete specimens were loaded at 7, 28, 91, and 182
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Highway workers face dangers from distracted drivers and challenging work zones, which results in thousands of incidents annually in the U.S. Traditional safety measures, though beneficial, highlight a need for advanced intrusion alert technologies. While many state DOTs are exploring these technologies, research gaps persist regarding their effect
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Iowa has a long history of PCC pavement overlays. Several research projects were placed over the years, which led to a variety of different designs and features. The objective of this study was to perform a review of concrete overlays performance on the interstate and primary system and determine any best practices or lessons learned.
NJDOT engaged Cambridge Systematics (CS) to review existing unmanned aircraft systems (UAS) practices within NJDOT and State DOTs to identify how UAS programs engage consultants, certify staff and consultants to conduct UAS missions, assess and manage risk associated with UAS missions, and manage and store data to comply with State and Federal regu
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The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics (CS) to review existing unmanned aircraft systems (UAS) practices within NJDOT and State Departments of Transportation (DOTs) to identify how UAS programs engage consultants, certify staff and consultants to conduct UAS missions, assess and manage risk associated with
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This brief guide offers advice for Iowa communities seeking to implement an “unticketing” program similar to Unticketing Cerro Gordo, a traffic safety campaign conducted in summer 2023 in Cerro Gordo County, Iowa. The campaign centered on a contest that incentivized safe driving behavior by awarding small prizes to drivers who opted into the contes
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The California Department of Transportation (Caltrans) is mandated to conduct Federal Endangered Species Act (FESA) Section 7 and California Endangered Species Act (CESA) consultations for projects potentially impacting federally and state-listed species. Coho salmon (Oncorhynchus kisutch), listed under both FESA and CESA, require precise data on p
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2023-12-01
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In this annual report, Traffic Safety Facts 2021: A Compilation of Motor Vehicle Traffic Crash Data, the National Highway Traffic Safety Administration presents descriptive statistics about traffic crashes of all severities, from those that result in property damage to those that result in the loss of human life. Fatal traffic crash data from the F
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In 2009, the FHWA’s Manual on Uniform Traffic Control Devices (MUTCD) introduced the flashing yellow arrow (FYA) traffic signal as an alternative to circular green (CG) to indicate permitted left turns. The FYA is arguably a more intuitive indication that left turns are permitted but not protected and, in addition, the FYA signal heads can support
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Assessing the return on investment in transportation research is crucial to ensuring program goals are met, knowledge and technology are shared broadly, and future investigations are prioritized. A recent effort leveraged existing MnDOT and LRRB tools and processes to evaluate and communicate the value of innovation and research. A new benefit moni
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Expansion joints on bridge structures allow for essential thermal movements of structural components but often at the cost of regular maintenance and periodic replacement to counter damage the joint may experience throughout its lifecycle. This project was conducted to study the potential for eliminating or removing expansion joints for one of the
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New technologies, such as unmanned aerial vehicles (UAVs) and machine learning, have been used to conduct imagery-based bridge inspections and evaluate damage on bridges. However, corrosion detection is still an open problem, and corrosion detection algorithms have only proven adequate in certain environments and conditions. The main goal of this p
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