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.
This research effort is part of a collaborative research project between the North Carolina Department of Transportation (NCDOT) and North Carolina State University’s (NCSU’s) Institute for Transportation Research and Education (ITRE). NCDOT Rail Division's mission is the “…safe and efficient movement of people and goods on North Carolina's railroa
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Arizona Department of Transportation's (ADOT) Employee and Business Development (EBD) office develops and provides required and elective training to ADOT staff and to external stakeholders. For its training programs, EBD’s objectives are to: (1) Improve employee competence and performance to enhance the performance of the agency; (2) Improve employ
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Portland Cement Concrete (PCC) is the most widely used construction material due to its versatility, durability, and economy (Mindess et al. 2003). However, PCC is also a quasi-brittle material that has low tensile strength and ductility, as well as weak resistance to the propagation of cracks. Also, problems related to shrinkage, durability and wo
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In the California Connected Vehicle (CV) Testbed, four intersections have been instrumented with NoTraffic sensors for more accurate detection of multi-modal traffic within the intersection conflict area, and six operational High Intensity Activated CrossWalK (HAWK) signals have been installed to enhance the safety for pedestrians and cyclists whil
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The effect of initial curing temperature and duration on the 28-day compressive strength of concrete was experimentally evaluated. Concrete cylinders were cured at six initial curing temperatures (60, 68, 78, 84, 90, and 100 ⁰F) for three different initial curing durations (24, 48, and 72 hours). After the initial curing duration was complete, the
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Although classification tables based on susceptibility to chloride ion permeability are recommended in AASHTO T 358, the classification levels with respect to durability parameters may or may not be adequate. Of interest for concrete pavement performance, this study verifies the recommended classification levels against standard durability testing
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Transportation systems, as integral parts of human settlements, reflect the societal structures and cultural ideologies influenced predominantly by the dominant race or class. In the absence of prioritizing the transportation needs of underserved communities, transportation systems may perpetuate systematic inequities. This study aims to address th
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The performance of continuously reinforced concrete pavement (CRCP) in Texas has been excellent. However, truck traffic in Texas has been increasing, which required thicker slabs. Since TxDOT placed steel at the mid-depth of the slab, the use of thicker slabs increased the distance between top of the slab and longitudinal steel. This increase resul
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This project’s goals were to understand the features or characteristics of ponds that impact their ability to retain phosphorus and then develop practical tools and recommendations for management practices.
Building information modeling is a combination of technology and processes that has made significant changes to the architecture, engineering, construction, and operations industries. By enabling the visualization of project elements and their data in 3D, it allows for a reduction in unbudgeted changes, increased collaboration and efficiency, and n
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Building information modeling is a combination of technology and processes that has made significant changes to the architecture, engineering, construction, and operations industries. By enabling the visualization of project elements and their data in 3D, it allows for a reduction in unbudgeted changes, increased collaboration and efficiency, and n
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The Texas Department of Transportation desires to flare the ends of its freestanding single-slope concrete barrier system so the system can be terminated outside the clear zone. Currently, limited guidance exists on the acceptable flare rate for the single-slope portable concrete barrier under the American Association of State Highway and Transport
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This research was conducted to evaluate the performance of three commercially available BFRP rebar products, before and after exposure to nine different aggressive environments, to develop acceptance criteria specifically for basalt-based fiber-reinforced polymer (BFRP) reinforcing bars.
Managed lanes provide transportation agencies with a strategy for reducing congestion and improving travel times along urban highways. These designated lanes, known as E-ZPass lanes in Minnesota, are available to carpoolers and transit users for free during high-traffic times, while vehicle owners who are driving alone pay a fee.
With mounting concerns over climate change and the environmental impact of fossil fuels, the United States has witnessed a growing interest in alternative fuel vehicles (AFVs). In 2021, approximately 1.5 million battery EVs (BEVs), 0.8 million plug-in hybrid EVs (PHEVs), and 5.5 million hybrid EVs (HEVs) were registered in the United States. In the
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A novel infrastructure design known as the J-turn intersection reduces the risk of serious and fatal crashes at thru-STOP intersections through decreasing points of conflict at an intersection by restricting crossing movements from the minor road. Despite their demonstrated safety efficacy, J-turns have not been met with uniformly positive support.
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Minnesota has a large number of low-volume asphalt roads. These roads typically fail because of environmental factors, such as frigid temperatures, freeze-thaw cycles, and seasonal and daily temperature variations. The goal of this study was to suggest modifications to asphalt mixture designs currently used for low-volume roads in Minnesota to impr
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This research investigated the effects of incorporating recycled concrete aggregate (RCA) at low replacement levels on the properties of concrete. Four different RCA sources were used, each with different aggregate properties. For each source, replacement levels of 5, 10, and 15% were tested and compared to a control group, which had no RCA. Of the
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The purpose of the tests reported herein was to assess the performance of prioritized attachments to concrete barrier systems according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH), Second Edition. The crash tests for th
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Concrete rigid barriers are used in medians to separate traffic and on the roadside to shield hazards from motorists and motorists from hazards. These barriers need to demonstrate crashworthiness through full-scale testing per the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH). Attachm
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