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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 2261 - 2280 of 36151 results
  • Assessing Sustainability of ECommerce Goods Distribution
    Assessing Sustainability of E-Commerce Goods Distribution
    Pahwa, Anmol
    ORCID ICON IMG
    2023-01-01 | PDF
    The growth of e-commerce, spurred by the internet, has transformed urban goods flow. What would previously have been a trip to a store is now a hassle-free delivery to the home. With consolidated and optimized delivery tours, e-commerce has the potential to make urban goods flow economically viable, environmentally efficient, and socially equitable ...
  • 21 Roadway Design Guidance Update
    2+1 Roadway Design Guidance Update
    Jasper, Jeff ;
    Wolfe, Jeff
    2023-01-01 | PDF
    The frequency and severity of crashes on rural two-lane roadways have increased in the US relative to other road types. This trend can be explained by the growing number of vehicles, higher speeds, narrow shoulders, and vehicle mixes. One solution for improving traffic flow and safety outcomes on rural two-lane roadways is to adopt a 2+1 design, wh ...
  • Approaches for Assessing Flows Concentrations and Loads of Highway and Urban Runoff and ReceivingStream Stormwater in Southern New England With the Stochastic Empirical Loading and Dilution Model SELDM
    Approaches for Assessing Flows, Concentrations, and Loads of Highway and Urban Runoff and Receiving-Stream Stormwater in Southern New England With the Stochastic Empirical Loading and Dilution Model (SELDM)
    Granato, Gregory E. ;
    Spaetzel, Alana B
    2023-01-01 | PDF
    The Stochastic Empirical Loading and Dilution Model (SELDM) was designed to help quantify the risk of adverse effects of runoff on receiving waters, the potential need for mitigation measures, and the potential effectiveness of such management measures for reducing these risks. SELDM is calibrated using representative hydrological and water-quality ...
  • Considering FareFree Transit in the Context of Research on Transit Service and Pricing A Research Synthesis
    Considering Fare-Free Transit in the Context of Research on Transit Service and Pricing: A Research Synthesis
    King, Hannah ;
    Taylor, Brian D.
    2023-01-01 | PDF
    In this report, we examine both the substantial research literature on transit pricing and use and literature on free- and reduced fare (FAR) programs. In general, we find that FAR programs can take many forms, and the idea of “fare-free” transit is far from a one-size-fits-all proposition. Second, while reducing or eliminating fares does indeed in ...
  • Developing Customized NRCS Unit Hydrographs Finley UHs for Ungauged Watersheds in Indiana
    Developing Customized NRCS Unit Hydrographs (Finley UHs) for Ungauged Watersheds in Indiana
    Huang, Tao ;
    Merwade, Venkatesh
    2023-01-01 | PDF
    The Natural Resources Conservation Service (NRCS, formerly the Soil Conservation Service, SCS) unit hydrograph (UH) is one of the most commonly used synthetic UH methods for hydrologic modeling and engineering design all over the world. However, previous studies have shown that the application of the NRCS UH method for some ungauged watersheds in t ...
  • The Policy and Politics of Highway Expansions
    The Policy and Politics of Highway Expansions
    Lee, Amy Elisabeth
    2023-01-01 | PDF
    This mixed-methods dissertation explores questions related to the governance landscape and the institutional and political factors that surround highway expansion projects. Highways and highway building are a central contributor to a myriad of environmental and social problems, ranging from local air pollution to global climate change to displaceme ...
  • Safe and CostEffective Reduction of Load Postings for South Carolina Bridges
    Safe and Cost-Effective Reduction of Load Postings for South Carolina Bridges
    Ziehl, Paul ;
    Cousins, Tommy
    2023-01-01 | PDF
    South Carolina has over 9,000 bridges in its inventory, many of which were designed for H10 or H15 truck loads. Precast reinforced concrete flat slabs are the primary bridge type addressed. These components were chosen in consultation with SCDOT due to their prevalence in the bridge inventory and resolving associated performance issues will therefo ...
  • SCDOT Scope of Services Template Research
    SCDOT Scope of Services Template Research
    Bausman, Dennis ;
    Mousavi, Ehsan
    2023-01-01 | PDF
    In the United States, federal, state, and local governments are responsible for addressing their residents' transportation infrastructure needs. Similar to most State Departments of Transportation (State DOTs), the South Carolina Department of Transportation (SCDOT) is responsible for owning, operating, and maintaining a large transportation system ...
  • Synthesis Study on Employing Snowplow Driving Simulators in Training
    Synthesis Study on Employing Snowplow Driving Simulators in Training
    Debs, Luciana ;
    Zheng, Yanchao
    2023-01-01 | PDF
    Departments of Transportation (DOTs) need to mobilize workers under harsh weather conditions for winter operations. Traditional snowplow driver training at INDOT is usually conducted annually before the snow season; therefore, it does not replicate the conditions which drivers will be exposed to during winter operations. To this point, some state D ...
  • Pavement Marking Decision Tree Project Level For a New Surface or Replacing Existing Markings with a Different Material
    Pavement Marking Decision Tree – Project Level: For a New Surface or Replacing Existing Markings with a Different Material
    Marti, Michael ;
    Jackels, Jon
    2023-01-01 | PDF
    This Tool serves as a guide to assist agencies in understanding their options and determining which pavement marking material may be considered for a new surface or when replacing existing markings with a different material. That said, no one size fits all. Engineers should use their engineering judgment and seek expert advice when necessary.
  • TRACtion Transformative Transportation an Introduction
    TRACtion: Transformative Transportation – an Introduction
    University of California, Los Angeles. Institute of Transportation Studies  ...
    2023-01-01 | PDF
    TRACtion seeks to narrow community-academia gaps through an intentional, proactive effort to systematically and productively engage local nonprofits and CBOs to encourage cross-sector knowledge transmission; inspire the co-development of use-inspired research agendas; and mobilize UCLA knowledge and innovations to accelerate impact in the region. T ...
  • Louisiana Transportation Research Center Annual Report 20222023
    Louisiana Transportation Research Center: Annual Report 2022–2023
    Louisiana Transportation Research Center
    2023-01-01 | PDF
    This publication is a report of the transportation research, technology transfer, education, and training activities of the Louisiana Transportation Research Center for 2022-2023. The center is sponsored jointly by the Louisiana Department of Transportation and Development and Louisiana State University.
  • GeoStatistical Deep Foundation Software Final Report
    Geo-Statistical Deep Foundation Software [Final Report]
    Davidson, Michael T. ;
    Rodgers, Michael B
    2023-01-01 | PDF
    When performing geotechnical design of bridge foundations, two sources of uncertainty that arise are spatial variability of soil (and rock) properties and bias intrinsic to empirical correlations (method error) that relate geotechnical site measurements to predictions of foundation member resistance. In current practice, spatial variability and met ...
  • Culvert Type Evaluation
    Culvert Type Evaluation
    Local Road Research Board
    2023-01-01 | PDF
    There are three commonly used culvert types in Minnesota: concrete, corrugated steel pipe (CSP) and plastic. The latter is relatively newer. Therefore, Minnesota local agencies requested more insight on how to select a culvert type. A literature search was conducted, and although there are several technical resources, most of them focused on design ...
  • Development of a Multiple Water Course Joint Probability Analysis Procedure for Indiana Watersheds
    Development of a Multiple Water Course Joint Probability Analysis Procedure for Indiana Watersheds
    Ghanghas, Ankit ;
    Dey, Sayan
    2023-01-01 | PDF
    The design of hydraulic structures located near a confluence of two streams must take into consideration the flows from both of the streams. A hydraulic structure located on a small tributary that drains into a large river immediately downstream is not just affected by the flow in the tributary, but also by the backwater flow from the downstream ri ...
  • Examining US Transit Vehicle Passenger Loads During the COVID19 Pandemic
    Examining US Transit Vehicle Passenger Loads During the COVID-19 Pandemic
    Dai, Tianxing ;
    Taylor, Brian D.
    2023-01-01 | PDF
    Transit ridership plummeted at the onset of the COVID-19 pandemic, and what constituted passenger crowding contracted dramatically as well. We examine trends in average passenger loads and their correlates in a national sample of U.S. transit operators during the first year of the pandemic and find that passenger loads in high-transit-ridership are ...
  • Well Control Equipment Systems Safety 2023 Annual Report
    Well Control Equipment Systems Safety: 2023 Annual Report
    United States. Department of Transportation. Bureau of Transportation Statistics
    2023-01-01 | PDF
    The Well Control Equipment Systems Safety – 2023 Annual Report, produced by the Bureau of Transportation Statistics, summarizes well control equipment (WCE) failure events that occurred during well operations in the Gulf of Mexico (GOM) Outer Continental Shelf (OCS) from 2017 to 2023. This report is based on information collected through SafeOCS, a ...
  • Development of a PerformanceRelated Test for Designing Seal Coats Final Report
    Development of a Performance-Related Test for Designing Seal Coats: Final Report
    Masad, Ahmad ;
    Adwani, Dheeraj
    2023-01-01 | PDF
    TxDOT’s seal coat program is critical to preserving its existing roadway infrastructure and ensuring roadways retain adequate skid resistance. However, sometimes seal coats fail prematurely due to factors such as incompatibility between aggregate and binder and/or binder that has poor durability while meeting other specification requirements. Seal ...
  • Defining Operational Design Domains for the Safe Blending of CAVs in the Traffic Stream Project 07033 Video
    Defining Operational Design Domains for the Safe Blending of CAVs in the Traffic Stream: Project 0-7033 [Video]
    Martin, David ;
    West, Kelly D
    2023-01-01 | MPEG
    "The Center for Transportation Research at the University of Texas-Austin recently completed a project that compared automated vehicle performance and human driving behavior in several virtual highway and urban environment scenarios. The research team then analyzed the safety, mobility, and human-factors results to draw conclusions and formulate te ...
    Supporting Files
  • Prediction of Interstate Travel Time Reliability Phase II
    Prediction of Interstate Travel Time Reliability: Phase II
    Zhao, Mo ;
    Appiah, Justice
    2023-01-01 | PDF
    Accurate prediction of travel time reliability measures would help state departments of transportation set performance targets and communicate the progress toward meeting those targets as required by the Moving Ahead for Progress in the 21st Century Act (MAP-21). In a recent Virginia Transportation Research Council study, Methods to Analyze and Pre ...
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