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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 2921 - 2940 of 36873 results
  • Illinois Highway Materials Sustainability Efforts 2021
    Illinois Highway Materials Sustainability Efforts 2021
    Morse, Kelly L.
    2022-08-24 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Developing Countermeasures to Decrease Pedestrian Deaths
    Developing Countermeasures to Decrease Pedestrian Deaths
    Kockelman, Kara M. ;
    Perrine, Kenneth A.
    2022-08-01 | PDF
    In efforts to reverse the rising rate of pedestrian-related crashes in Texas, researchers analyze crash data to determine common causes and effective countermeasures. Extensive use of visualizations, regression models, advanced tree-based analysis, and geographic information system (GIS)-based data management adds insight. Significant variables inc ...
  • Development of a PerformanceRelated Test for Designing Seal Coats Project Summary
    Development of a Performance-Related Test for Designing Seal Coats [Project Summary]
    Bhasin, Amit ;
    Adwani, Dheeraj
    2022-08-01 | PDF
    The researchers investigated the effects of several influencing factors on the performance of seal coats based on a thorough literature review and a survey of TxDOT and other state DOT personnel. They evaluated tests that could be used to measure the binder-aggregate compatibility and adhesion. The study used modifications of a Sweep test and Viali ...
  • The State of Practice in Community Impact Assessment
    The State of Practice in Community Impact Assessment
    Barajas, Jesus M. ;
    Braun, Lindsay M
    2022-08-01 | PDF
    The objective of this research was to provide recommendations to the Illinois Department of Transportation for updating and revising the “Community Impact Assessment Manual” in accordance with the latest research and practice. The guide incorporated findings from a literature review, a scan of state department of transportation (DOT) community impa ...
  • Assessment Repair and Replacement of Bridges Subjected to Fire
    Assessment, Repair, and Replacement of Bridges Subjected to Fire
    Dahlberg, Justin ;
    Phares, Brent M.
    2022-08-01 | PDF
    Although bridge fires are not frequent events, they pose impacts on safety, traffic flow, and the economy given bridge repairs or replacement can be costly. A lack of information and the tools needed to evaluate fire damage to concrete bridges and to aid in decisions for both immediate and long-term use of fire-damaged bridges was the impetus for t ...
  • GFRP Reinforced Bridge Barriers Numerical Modeling
    GFRP Reinforced Bridge Barriers: Numerical Modeling
    Wei, Congjie ;
    Myers, John
    2022-08-01 | PDF
    The reported work enclosed the numerical modeling of GFRP reinforced concrete bridge barrier under static and impact load. The GFRP configurations were designed to fit into the existing MoDOT Type D barrier structures. The constructability of the GFRP reinforcement was also taken into consideration. Both static and dynamic loading were modeled to e ...
  • Estimating Soil Pressure Against Unyielding Surfaces
    Estimating Soil Pressure Against Unyielding Surfaces
    Rodgers, Michael ;
    McVay, Michael
    2022-08-01 | PDF
    This report focuses on the earth pressures that develop when two MSE walls are tied together, creating an unyielding condition. During the research an extensive literature review was completed that included current design practices and standards, and construction and quality control procedures. This ensured the constructed wall configurations adher ...
  • RiskBased Inspection
    Risk-Based Inspection
    Cai, Hubo ;
    Zhang, Yuxi
    2022-08-01 | PDF
    Construction inspection is a critical component of the quality assurance/quality control (QA/QC) program at the South Carolina Department of Transportation (SCDOT). A pressing challenge SCDOT has been facing is to balance the increasing demand to rebuild the statewide transportation systems with declining resources available for inspection. This pr ...
  • Steering Californias Transportation Future A Report on Possible Scenarios and Recommendations
    Steering California's Transportation Future: A Report on Possible Scenarios and Recommendations
    Gahbauer, John ;
    Matute, Juan
    2022-08-01 | PDF
    To investigate possible future transportation and land use scenarios for California as well as their likely precipitating policies and potential consequences, we convened a panel of 18 experts and used a novel variation of the Delphi method to systematically explore four specific scenarios and probe the desirability and likelihood of each. The scen ...
  • MiniRWIS PILOT PROJECT 2020 2022 A PublicPrivate Partnership Demonstration Project Between Campbell Scientific Inc and the Alaska Department of Transportation Public Facilities in Collaboration With the University of Alaska Fairbanks Institute of Northern Engineering and GeoWatersheds Scientific
    Mini-RWIS PILOT PROJECT (2020 – 2022): A Public-Private Partnership Demonstration Project Between Campbell Scientific, Inc. and the Alaska Department of Transportation & Public Facilities in Collaboration With the University of Alaska Fairbanks (Institute of Northern Engineering) and Geo-Watersheds Scientific
    Randall, Kevin ;
    Connor, Billy
    2022-08-01 | PDF
    In 2019, Campbell Scientific, a manufacturer of research-grade data acquisition systems entered a public/private partnership project with the Alaska Department of Transportation and Public Facilities (ADOT&PF) to demonstrate the scalable (mini) Road Weather Information System (RWIS) concept. This partnership included research personnel from the Uni ...
  • Policies and Design Guidelines To Plan for Connected and Autonomous Vehicles
    Policies and Design Guidelines To Plan for Connected and Autonomous Vehicles
    Benkraouda, Ouafa ;
    Braun, Lindsay Maurer
    2022-08-01 | PDF
    This report chronicles the work undertaken by researchers at the University of Illinois Urbana Champaign to identify policies and design guidelines to plan for connected and autonomous vehicles (CAVs) in mid-sized regions in Illinois. The report starts with the goals of this work followed by a review of existing literature. The review addresses CAV ...
  • Implementation of Improved Performance Grade PG of Asphalt Binders Final Report
    Implementation of Improved Performance Grade (PG) of Asphalt Binders: Final Report
    Filonzi, Angelo ;
    Mohanraj, Kiran
    2022-08-01 | PDF
    Given the importance of the quality of asphalt binder in resisting crack growth in asphalt mixtures, there is a critical need for a simple and accurate test to evaluate the cracking resistance of asphalt binders. Most current tests are based on rheological indices and do not induce cracking in asphalt binders. Researchers have developed a simple “p ...
  • 3D StrutandTie Modeling for Design of Drilled Shaft Footings Under Biaxial Eccentric Loading
    3D Strut-and-Tie Modeling for Design of Drilled Shaft Footings Under Biaxial Eccentric Loading
    Yi, Yousun ;
    Hyunsu, Kim
    2022-08-01 | PDF
    This project establishes a series of design guidelines for drilled shaft footings subjected to biaxial eccentric loading by refining the design recommendations of TxDOT Project 0-6953. The refined guidelines include the single strut– and single tie–based equivalent force system, development of 3D strut-and-tie models for biaxial eccentric loading s ...
  • Impacts of Intersection Treatments and Traffic Characteristics on Bicyclist Safety
    Impacts of Intersection Treatments and Traffic Characteristics on Bicyclist Safety
    Russo, Brendan ;
    Hurwitz, David S.
    2022-08-01 | PDF
    This study assessed the safety impact and performance of three different bicycle-specific intersection treatments (bike boxes, mixing zones, and bicycle signals) using surrogate safety measures (i.e., bicycle-vehicle conflicts and other non-crash measures). To date, limited research had been conducted to analyze how these treatments along with traf ...
  • KRS and KAR Review of Models as a Legal Contract Document
    KRS and KAR Review of Models as a Legal Contract Document
    Gibson, Bryan ;
    Clay-Young, Pam
    2022-08-01 | PDF
    State departments of transportation (DOTs) are expanding the use of electronic engineering data (EED) throughout highway projects — from design and construction through asset management. Included under the umbrella of EED are technologies such as building information modelling (BIM), digital terrain models (DTMs), and 3D models and plan sets. The K ...
  • Can Rebates Foster Equity in Congestion Pricing Programs
    Can Rebates Foster Equity in Congestion Pricing Programs?
    Sallee, James M ;
    Tarduno, Matthew A
    2022-08-01 | PDF
    Congestion pricing improves economic efficiency, but it may lead to inequitable outcomes. A key policy priority in California is identifying ways to avoid the hardship of congestion pricing on low income or other vulnerable populations. This study uses data from a congestion pricing experiment in the Seattle metro area to examine the feasibility of ...
  • Assessment of Transportation Systems Resilience for Vulnerable Communities and Populations
    Assessment of Transportation Systems Resilience for Vulnerable Communities and Populations
    Carver, Jennifer Z ;
    Abdelrazig, Yassir
    2022-08-01 | PDF
    Florida Department of Transportation identified resilience as a critical priority in its Florida Transportation Plan (FTP). Resilient transportation systems are assets that can withstand disruptions, adapt to changing conditions, perform effectively, and recover rapidly. Historically, disruptions from natural hazards are more consequential, with mo ...
  • TELEcommuting during the COVID19 Pandemic and Beyond Unveiling Statewide Patterns and Trends of Telecommuting in Relation to Transportation Employment Land Use and Emissions in California Summary
    “TELE-commuting” during the COVID-19 Pandemic and Beyond: Unveiling State-wide Patterns and Trends of Telecommuting in Relation to Transportation, Employment, Land Use, and Emissions in California [Summary]
    Lu, Tianjun ;
    Ke, Jian-yu
    2022-08-01 | PDF
    Telecommuting, which enables employees to perform job tasks remotely at home, increased significantly (25% to 35%) early in the COVID-19 pandemic. This shift represented a major societal change that reshaped the family, work, and social lives of many Californians, also raising important questions about what factors influenced telecommuting before, ...
  • Development of a Strategy To Address LoadPosted Bridges Through Reduction in Uncertainty in Load RatingsVolume 2 Load Testing and Modeling for Refined Load Rating
    Development of a Strategy To Address Load-Posted Bridges Through Reduction in Uncertainty in Load Ratings—Volume 2: Load Testing and Modeling for Refined Load Rating
    Hueste, Mary Beth ;
    Hurlebaus, Stefan
    2022-08-01 | PDF
    Maintaining the functionality of the transportation infrastructure depends on the successful management of aging bridge assets. Departments of transportation rely on the load rating process to evaluate the sufficiency of the bridge structures in their state, and they post load restrictions if the capacity of a bridge does not meet the maximum load ...
  • Performance of Asphalt Rubber GapGraded Mixture Overlays Over Jointed Concrete Pavements
    Performance of Asphalt Rubber Gap-Graded Mixture Overlays Over Jointed Concrete Pavements
    Nair, Harikrishnan ;
    Hossain, Shabbir
    2022-08-01 | PDF
    The Virginia Department of Transportation (VDOT) maintains 3,343 lane-miles of composite pavements (asphalt over jointed concrete or continuously reinforced concrete pavements). Propagation of cracks from existing pavements into new asphalt concrete overlays (reflective cracking) is a major problem with composite pavements. Treatments that are used ...
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