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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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0 of 1000
Showing 2001 - 2020 of 36151 results
  • 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 ...
  • Expanding the NCDOTs Current Risk Management Program
    Expanding the NCDOT’s Current Risk Management Program
    Jaselskis, Edward J. ;
    Gholami, Sina
    2023-05-31 | PDF
    Enhancing the risk management program within the North Carolina Department of Transportation (NCDOT) is the focus of this collaborative research project with North Carolina State University (NCSU). The objective is to provide valuable insights and best practices to strengthen the NCDOT's Value Management Office (VMO) and implement an effective risk ...
  • Development of NonFracture Critical Steel Box Straddle Caps Project Summary Report
    Development of Non-Fracture Critical Steel Box Straddle Caps [Project Summary Report]
    Helwig, Todd ;
    Zecchin, Esteban
    2023-05-31 | PDF
    The research study included full-scale experimental testing and parametric finite element (FE) analyses, which resulted in a proposed methodology to estimate the flexural resistance of steel box caps following a potential fracture event. The work was conducted at the Ferguson Structural Engineering Laboratory at The University of Texas at Austin. T ...
  • Developing a Safe System Approach to Setting Speed Limits
    Developing a Safe System Approach to Setting Speed Limits
    Griswold, Julia B ;
    Lutzker, Liza
    2023-05-31 | PDF
    Over the last decade in California there has been a surge in the number of traffic fatalities, with especially large increases in pedestrian fatalities. At the same time, the California Department of Transportation (Caltrans) has affirmed a vision of reaching zero fatalities and serious injuries on state highways by 2050 and has committed the depar ...
  • Inventory Operations and Safety at Free RightTurn Ramps
    Inventory, Operations, and Safety at Free Right-Turn Ramps
    Khattak, Aemal J. ;
    Camenzind, Jonathon
    2023-05-31 | PDF
    This research focused on traffic safety and operational performance of rural, minor approach stop-controlled intersections with free right-turn (FRT) ramps. The objectives of the research were to: • Create a statewide inventory of rural FRT ramp intersections and provide to the Nebraska Department of Transportation (NDOT), • Using NDOT 10-year cras ...
  • Nebraska Balanced Mix Design Phase I
    Nebraska Balanced Mix Design – Phase I
    Yazdipanah, Farzad ;
    Khedmati, Mahdieh
    2023-05-31 | PDF
    Balanced mix design (BMD) is an alternative concept for designing asphalt mixtures that mainly focuses on performance of mixtures rather than only volumetric analysis. Using this concept, it would be possible to account for the incorporation of recycled asphalt mixtures, warm technology, polymers, rejuvenators, and other foreign additives, as well ...
  • ALTRIOS Advanced Locomotive Technology and Rail Infrastructure Optimization System
    ALTRIOS - Advanced Locomotive Technology and Rail Infrastructure Optimization System
    National Renewable Energy Laboratory (NREL) (U.S.)  ...
    2023-05-17 | PDF
    The Advanced Locomotive Technology and Rail Infrastructure Optimization System (ALTRIOS) is an open-source modeling framework developed to evaluate strategies for decarbonizing freight rail transportation. Introduced at the 2023 FRA Workshop on Decarbonization of Rail Transportation, ALTRIOS simulates train dynamics, powertrain performance, energy ...
  • Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways Final Report
    Greenhouse Gas Emissions Inventory from Construction of Washington State Department of Transportation Roadways: Final Report
    Ashtiani, Milad ;
    Lewis, Meghan
    2023-05-16 | PDF
    Recent emphasis on actions to reduce large-scale greenhouse gas (GHG) emissions has pushed most state departments of transportation (DOTs) to develop carbon accounting practices compatible with their current standard data collection and storage practices. In particular, with the recently passed Buy Clean Acts in California, Colorado, and Oregon and ...
  • Evaluate Geophysical Methods to Detect Underground Voids Project Summary
    Evaluate Geophysical Methods to Detect Underground Voids [Project Summary]
    Kallivokas, Loukas ;
    Cai, Mingwei
    2023-05-05 | PDF
    The primary objective of the project is to lend clarity on the applicability and limitations of each one of the four geophysical methods, while also arriving at recommendations for the most appropriate course of action when faced with site investigations aimed at detecting the presence of voids.
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