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.
Vermont Agency of Transportation has adopted use of the accelerated bridge construction (ABC) approach to deliver bridge construction and reconstruction projects. While ABC projects enjoy high material quality due to a large fraction of precast and prefabricated elements, connections between these elements must be placed in-situ. These are often tr
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A variety of physical property measurements were performed including Dynamic Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA), compression testing, tensile testing, heat deflection temperature (HDT) testing, and Coefficient of Thermal Expansion (CTE) testing. Results showed a wide range of properties of the resins. Lab scale applicatio
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While the Ohio Department of Transportation (ODOT) has several models that quantify the economic benefits and impacts of its investments, the Economic Development Impact Tool (EDIT) is the unique product of national research in market access, development capacity, and historical economic performance. A review of national literature and existing ODO
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This report presents a possible stochastic methodology that can be used in identifying bridges with greater probability of failure from vehicular collisions. To meet this objective, this report first outlines the design of bridges against these collisions in the United States and compares against the Eurocode design methodology. Existing experiment
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This research studied Oregon drivers’ and cyclists’ conceivability of and receptivity to bike turnouts (auxiliary bike lanes). The driver and cyclist survey consisted of 32 and 35 questions, respectively, all of which were fixed choice, except for 3 open-ended response questions. The surveys were distributed online to 612 Oregon residents, made up
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This report presents a comprehensive analysis of work zone safety considering multiple factors, including crash severity, speed analysis, countermeasure analysis, and state-of-the-practice in DOTs. It encompasses a broad literature review, drawing from DOT reports, NCHRP publications, MUTCD guidelines, and academic research, to explore a range of t
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This paper proposes a new method for network screening on rural low-volume roads. These roads are important as they provide critical access to agricultural land and tourist attractions. Most low-volume roads belong to the lowest functional class (local rural roads) and thus are built to lower design standards. Conventional hot spot network screenin
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United States. Department of Transportation. Highly Automated Systems Safety Center of Excellence
2024-04-01
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AI assurance refers to the techniques, activities, and processes used to evaluate and assure expected properties of AI components or AI-enabled systems throughout the lifecycle of these components or systems. The properties may relate to performance, safety, or security. Typical examples of AI assurance techniques are verification, validation, and
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Current Caltrans Standard Specifications for rubberized hot mix asphalt–gap-graded (RHMA-G) do not allow the inclusion of reclaimed asphalt pavement (RAP). This report summarizes the research conducted by the UCPRC in support of the Caltrans-industry initiative “10% RAP in RHMA-G,” whose goal is to evaluate the use of up to 10% RAP (by aggregate re
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We interviewed eight subject-matter experts in California in 2023 to understand how travel behavior and priorities may change in response to direct experience with road collisions. Experts represented a variety of perspectives, including medical doctors, advocates for active transportation safety, and advocates for people with disabilities. Their d
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This study discusses the potential economic and development impacts that high-speed rail (HSR) may bring to California. The research reviews the reported impacts of HSR implementation in various countries, particularly in Europe, and case studies of selected HSR station-cities in France, Spain, and Italy. The analysis suggests that HSR could bring
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The Midwest region of the United States, including Minnesota, has been experiencing an increase in the number of heavy precipitation events. Historical precipitation data confirmed an increasing trend of heavy precipitation in Minnesota in the 21st century. This study focused on assessing the impact of heavy-precipitation events on moisture levels
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Accurately predicting bat use of bridges is an important need for planning of bridge repair and maintenance. However, less than 1% of bridges in Ohio have been surveyed for bats, limiting the inferences that can be drawn from existing data and modelling tools. We developed a method for passive camera surveys of bat use of bridges and reevaluated OD
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This research is directed towards enhancements to the assessment and mitigation of liquefaction induced lateral spreading effects on bridge foundation systems. The conducted research scope and outcomes are presented. On this basis, insights are derived for improvement of the current assessment procedures, and mitigation of this detrimental mechanis
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This study presents the results of an analysis on the effects of Oregon’s speed zoning method on speed compliance and safety outcomes. Speed zones were selected in an urban area based on the availability of before and after speed data. Data for roadway context was collected, which included population, equity, land use, roadway, and exposure charact
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While LiDAR (light detection and ranging) is not a new technology to UDOT, mobile LiDAR has not been used to enhance culvert inspections. The study reviewed two types of mobile scanning technologies for testing culverts, Pocket LiDAR (iPhone 12 Pro based laser emitter that is used to improve accuracy of photogrammetry) and SLAM LiDAR (simultaneous
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This research project sought to better understand the mechanisms of pile driving-induced ground vibrations in loose to medium-loose soils. Additionally, the research team sought to develop a method for predicting ground deformations caused by impact pile driving, specifically for the characteristics of Central Florida soil conditions.
While the Ohio Department of Transportation (ODOT) has several models that quantify the economic benefits and impacts of its investments, the Economic Development Impact Tool (EDIT) is the unique product of national research in market access, development capacity, and historical economic performance. A review of national literature and existing ODO
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United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
2024-04-01
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This is the updated and revised Fatality Analysis Reporting System (FARS) Analytical User’s Manual for the period 1975 to 2022. This manual presents the evolution of FARS coding from inception through present. It includes the data elements that are contained in FARS and other useful information that will enable the users to become familiar with the
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Jay’s Majic Mud (JMM) was investigated for possible use as either a rapid-set patching material or as a potential new alternative, novel, thin-bonded overlay system. In its current pre-packaged form, JMM does not meet the requirements for rapid-set material use, nor does it meet the permeability requirements needed for use as a standalone (neat) mi
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