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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.

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Showing 1981 - 2000 of 36114 results
  • Load Rating for Corrugated Metal Culverts under Shallow Cover Depths
    Load Rating for Corrugated Metal Culverts under Shallow Cover Depths
    Anderson, J. Brian ;
    Davidson, James S.
    2023-06-01 | PDF
    The accuracy and applicability of existing methodologies and tools for load rating of corrugated metal culverts under shallow cover were thoroughly investigated through numerical modeling and field testing. The basis of three existing spreadsheet rating tools were investigated. Two existing culverts that are more than 80 years old and whose cover o ...
  • Designing and Implementing Maintainable Pedestrian Safety Countermeasures
    Designing and Implementing Maintainable Pedestrian Safety Countermeasures
    Veneziano, David ;
    Wood, Jonathan
    2023-06-01 | PDF
    While pedestrian safety countermeasures contribute to reducing vehicle-pedestrian crashes, their impacts on winter maintenance operations are sometimes overlooked during design. There is a need to investigate the best practice guidance and solutions for the design, installation and maintenance of pedestrian safety features for year-round maintenanc ...
  • Guidelines for Safer Pedestrian Crossings Understanding the Factors That Positively Influence Vehicle Yielding to Pedestrians at Unsignalized Intersections
    Guidelines for Safer Pedestrian Crossings: Understanding the Factors That Positively Influence Vehicle Yielding to Pedestrians at Unsignalized Intersections
    Stern, Raphael ;
    Li, Tianyi
    2023-06-01 | PDF
    Many factors influence an individual driver’s decision to yield or not yield to individual pedestrians attempting to cross the road at an unsignalized crossing. This study collects observational data from more than 3,300 crossing events at 18 intersections in Minnesota to further our understanding of what factors positively influence driver yieldin ...
  • Comparing the CostEffectiveness of Asphalt Binders for Local Roads
    Comparing the Cost-Effectiveness of Asphalt Binders for Local Roads
    Marasteanu, Mihai
    2023-06-01 | PDF
    Polymer-modified binders (PMB) have been shown over the decades to improve the mechanical properties of asphalt mixtures compared to unmodified binders. Considering its higher initial cost, selecting the best alternative is very important, especially for local agencies, given their limited budgets. A challenge in the materials selection process for ...
  • Merging Multiple Existing Geotechnical Databases
    Merging Multiple Existing Geotechnical Databases
    Sun, Charlie ;
    Rister, Brad
    2023-06-01 | PDF
    This report discusses a project undertaken by Kentucky Transportation Center (KTC) researchers to create a comprehensive geotechnical database for highway planning, design, maintenance, and repair. The project consolidated multiple geotechnical data sources into a unified database accessible to Kentucky Transportation Cabinet (KYTC) staff, enabling ...
  • Analysis of Local Bus Markets Phase III
    Analysis of Local Bus Markets, Phase III
    Devajyoti, Deka ;
    Carnegie, Jon A.
    2023-06-01 | PDF
    This research is a follow-up of the Analysis of Local Markets Phase I and Phase II studies conducted by the Alan M. Voorhees Transportation Center during 2015-18. Whereas the primary objectives of the Phase I study were to examine both traffic (i.e., congestion) and air quality (i.e., emission) impacts of local buses, the primary objective of the P ...
  • Traffic Safety Facts 2021 Data Large Trucks
    Traffic Safety Facts 2021 Data: Large Trucks
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-06-01 | PDF
    In 2021 there were 5,788 people killed in traffic crashes involving large trucks. This was a 17-percent increase from 4,945 in 2020. Seventy-two percent of people killed in large-truck traffic crashes in 2021 were occupants of other vehicles. Seventy-eight percent of the fatal traffic crashes involving large trucks in 2021 occurred on weekdays (6 a ...
  • Traffic Safety Facts 2021 Data AlcoholImpaired Driving
    Traffic Safety Facts 2021 Data: Alcohol-Impaired Driving
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-06-01 | National Transportation Statistics (NTS) | PDF
    Drivers are considered to be alcohol-impaired when their blood alcohol concentrations (BACs) are .08 grams per deciliter (g/dL) or higher. Thus, any fatal crash involving a driver with a BAC of .08 g/dL or higher is considered to be an alcohol-impaired-driving crash, and fatalities occurring in those crashes are considered to be alcohol-impaired-dr ...
  • CDOT Cognitive Roadside Device Evaluation Study
    CDOT Cognitive Roadside Device Evaluation Study
    Lyon, Craig ;
    Vanlaar, Ward
    2023-06-01 | PDF
    This project evaluated the viability of using the Cognivue Thrive to detect cognitive and physical impairment of drivers due to drugs. The device was tested in Boulder, Colorado during April of 2023 and results were compared with a blood sample. The report discusses lessons learned from testing of the Cognivue Thrive including technological, legal, ...
  • Maximizing Transportation Assets by Building Community Connection through Innovative Deployment of Rights of Way and Airspace
    Maximizing Transportation Assets by Building Community Connection through Innovative Deployment of Rights of Way and Airspace
    Douma, Frank ;
    Sheikh, Maya
    2023-06-01 | PDF
    This Minnesota Department of Transportation-sponsored research effort examined innovative right-of-way projects nationwide, focusing on how new and innovative practices for redeveloping transportation assets can meet ambitious goals such as mitigating environmental impacts, encouraging placemaking, and enhancing economic opportunity while continuin ...
    Supporting Files
  • Evaluate the Impacts of Complete Streets Policy in Louisiana
    Evaluate the Impacts of Complete Streets Policy in Louisiana
    Bian, Ruijie “Rebecca” ;
    Tolford, Tara
    2023-06-01 | PDF
    The goal of Complete Streets is to accommodate all road users and bring attention to the needs of vulnerable road users. In the last 10 years, thousands of local/regional/state agencies in the United States (U.S.) have adopted Complete Streets policies. However, it is not clear how successfully these policies have been implemented and to what exten ...
  • Evaluation of Liquefaction Induced Lateral Spread from Recent Alaska Earthquakes
    Evaluation of Liquefaction Induced Lateral Spread from Recent Alaska Earthquakes
    Yang, Zhaohui Joey ;
    Eng, C.
    2023-06-01 | PDF
    Widespread liquefaction and lateral spreading occurred after the 2002 M7.9 Denali fault earthquake. This provided a unique opportunity to evaluate lateral spreading displacement equations to areas of interior Alaska. The Newmark block analysis method and nonlinear solid-fluid coupled finite element models were used to assess the impact of seasonal ...
  • Uncrewed Aircraft Systems Technology Airspace Design Privacy and Safety in Idaho
    Uncrewed Aircraft Systems Technology, Airspace Design, Privacy and Safety in Idaho
    Totoricagüena, Gloria
    2023-06-01 | PDF
    This report examines existing guidelines in Idaho and in other states that lead in the implementation of UAS, in order to identify strategies to promote and regulate their use in Idaho’s airspace from the surface to 400 feet AGL. UAS innovations accelerate project delivery, increase roadway safety, reduce congestion, and improve environmental susta ...
  • Measuring Transportation Research Benefits in Utah
    Measuring Transportation Research Benefits in Utah
    Anderson, Douglas I. ;
    Lindsey, Rukhsana
    2023-06-01 | PDF
    Research benefits information was compiled to estimate the effectiveness of UDOT’s research program. Project benefits were gathered through survey responses submitted by the end users of the project deliverables. Using project costs, an estimate of the benefit-cost ratio for the program was determined. This information gathered for 57 research proj ...
  • Pilot Pollinator Habitat at UDOT Rest Area in Perry Utah
    Pilot Pollinator Habitat at UDOT Rest Area in Perry, Utah
    Wheeler, Mindy ;
    Yeager, Becky
    2023-06-01 | PDF
    This report outlines the process by which a portion of the I-15 Perry Rest Area in northern Utah was modified to include a functional pollinator habitat suitable for public education, outreach and enjoyment, as well as to provide much needed habitat for local pollinators, many of whom have experienced serious declines in their populations. Converti ...
  • Developing Safety Performance Function and Crash Modification Factor for Managed Lanes Separation Treatments Summary
    Developing Safety Performance Function and Crash Modification Factor for Managed Lanes Separation Treatments [Summary]
    Ponnaluri, Raj ;
    Alluri, Priyanka
    2023-06-01 | PDF
    How does a large state with growing traffic volumes maintain the safety and mobility of its traveling public? Managed lanes are one option. With managed lanes, the use of the lane changes depending on traffic conditions. These can either be a traditional non-reversible lane for each direction of travel or reversible, where the direction of traffic ...
  • Traffic Safety Facts 2021 Data State AlcoholImpairedDriving Estimates
    Traffic Safety Facts 2021 Data: State Alcohol-Impaired-Driving Estimates
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-06-01 | PDF
    This fact sheet covers estimates of alcohol-impaired driving by state. Of the 42,939 traffic fatalities in 2021 there were an estimated 13,384 people (31%) killed in alcohol-impaired-driving crashes. The highest percentage was in Montana (44%), followed by Texas (42%). Of the 60,904 drivers involved in fatal traffic crashes in 2021 there were an es ...
  • Development of GFRP Reinforced Single Slope Bridge Rail Brief
    Development of GFRP Reinforced Single Slope Bridge Rail [Brief]
    Freeman, Christina ;
    Consolazio, Gary R.
    2023-06-01 | PDF
    In the design of highway bridges in Florida, glass fiber reinforced polymer (GFRP) materials are starting to replace mild carbon steel as the basis for reinforcing structural concrete components. Whereas traditional steel rebar is susceptible to corrosion, GFRP rebar is not, and therefore the use of GFRP has the potential to reduce maintenance cost ...
  • WisDOT Data Governance Phase II
    WisDOT Data Governance, Phase II
    Graettinger, Andrew ;
    Li, Yang
    2023-06-01 | PDF
    The WisDOT Data Governance research project, conducted by the Institute for Physical Infrastructure and Transportation (IPIT) at the University of Wisconsin-Milwaukee (UWM), explored and developed recommendations for an implementation-ready WisDOT Data Governance Framework. This framework focuses on harmonizing data sources, controlling access, doc ...
  • 07033 Defining Operational Design Domains ODDs for the Safe Blending of Levels 04 Connected and Autonomous Vehicles CAVs in the Traffic Streams
    0-7033: Defining Operational Design Domains (ODDs) for the Safe Blending of Levels 0-4 Connected and Autonomous Vehicles (CAVs) in the Traffic Streams
    Chin, Kristie ;
    Wang, Junmin
    2023-05-31 | PDF
    Automated vehicles (AVs) present significant potential; yet, their technological maturity and performance remain to be proven. With several deployments underway in the state, it is critical for the Texas Department of Transportation (TxDOT) to provide the public with assurances that the AVs are performing safely in their intended operational enviro ...
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