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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 1801 - 1820 of 36104 results
  • State Challenges to Improving Traffic Safety Coordination
    State Challenges to Improving Traffic Safety Coordination
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    This report is prepared in response to a requirement in House Report 117-99 (p. 61) that accompanies the Consolidated Appropriations Act, 2022 (Public Law 117-103), requesting information on what challenges States are facing with improving their traffic safety coordination. This report examines challenges States face improving traffic safety inform ...
  • Revised Load Rating Procedures for Deteriorated Prestressed Concrete Beams
    Revised Load Rating Procedures for Deteriorated Prestressed Concrete Beams
    Stripsky, Alex ;
    Breña, Sergio
    2023-08-01 | PDF
    The first prestressed concrete bridge in the United States was built in the early 1950s. Since then, several typical sections have been developed for use in bridge construction including I-beams, deck slabs, box beams, double tees, and so forth. In bridges under aggressive environments, corrosion deterioration of prestressing strands and stirrups h ...
  • Incorporating the Site Variability and LaboratoryInSitu Testing Variability of Soil Properties in Geotechnical Engineering Design
    Incorporating the Site Variability and Laboratory/In-Situ Testing Variability of Soil Properties in Geotechnical Engineering Design
    Abu-Farsakh, Murad ;
    Rahman, Md. Habibur
    2023-08-01 | PDF
    The properties of geomaterials usually vary from one location to another within the same site, in both the vertical and horizontal directions. The variability of soil properties is a complex phenomenon that results from several sources of uncertainties, including inherited spatial variability, measurement error, statistical error, and model bias er ...
  • The Current State of Practice of Building Information Modeling
    The Current State of Practice of Building Information Modeling
    Brooks, Kevin ;
    Gerasimidis, Simos
    2023-08-01 | PDF
    Building information modeling is a combination of technology and processes that has made significant changes to the architecture, engineering, construction, and operations industries. By enabling the visualization of project elements and their data in 3D, it allows for a reduction in unbudgeted changes, increased collaboration and efficiency, and n ...
  • Using Surface Geometry to Identify Potential Hydroplaning Locations
    Using Surface Geometry to Identify Potential Hydroplaning Locations
    Gurganus, Charles ;
    Devadas, Arvind
    2023-08-01 | PDF
    Hydroplaning occurs because of a series of unfortunate events that result from a combination of driver behavior, vehicle characteristics, and roadway features. Surface geometry and roadway texture are two variables within the control of the managing agency. This study identified hydroplaning vulnerable areas using mobile light detecting and ranging ...
  • Workshop Guide Rapid Mix Design of CementTreated Base
    Workshop Guide: Rapid Mix Design of Cement-Treated Base
    Taylor, Ross ;
    Sebesta, Stephen
    2023-08-01 | PDF
    Objectives: Reduce the testing burden • Use less materials • Produce mix design results faster • Use with materials for both plant and road mix projects • Harmonize mix design approach, to the extent reasonable, across stabilizer types
  • Optimizing Asphalt Mixtures for Lowvolume Roads in Minnesota
    Optimizing Asphalt Mixtures for Low-volume Roads in Minnesota
    Barman, Manik ;
    Dhasmana, Heena
    2023-08-01 | PDF
    Minnesota has a large number of low-volume asphalt roads. These roads typically fail because of environmental factors, such as frigid temperatures, freeze-thaw cycles, and seasonal and daily temperature variations. The goal of this study was to suggest modifications to asphalt mixture designs currently used for low-volume roads in Minnesota to impr ...
  • Development of Protocols for Reuse Assessment of Existing Foundations in Bridge Rehabilitation and Replacement Projects
    Development of Protocols for Reuse Assessment of Existing Foundations in Bridge Rehabilitation and Replacement Projects
    Lim, Jeehee ;
    Salgado, Rodrigo
    2023-08-01 | PDF
    The existing foundations of a bridge can sometimes be reused. This may occur when a completely new bridge is built but also in bridge or superstructure widening projects. Reuse of existing foundations not only eliminates the costs associated with demolishing and disposing of old foundations, but also reduces the costs of the design and construction ...
  • Pile Setup and Restrike Procedures
    Pile Setup and Restrike Procedures
    Rosenblad, Brent L. ;
    Boeckmann, Andrew Z.
    2023-08-01 | PDF
    The primary objective of this research is to provide MoDOT with rational procedures and guidelines to incorporate pile setup in MoDOT pile design. Pile setup refers to the time-dependent increase in the capacity of driven piles that occurs after the end of piledriving. High-strain dynamic load test data from end of driving (EOD) and beginning of re ...
  • Enhancing Pavement Marking Management Practices in Wyoming
    Enhancing Pavement Marking Management Practices in Wyoming
    Tajnin, Mst Rahanuma ;
    Farid, Ahmed
    2023-08-01 | PDF
    Pavement markings safeguard road users, and maintaining adequate retroreflectivity is crucial for ensuring road safety. As the Wyoming Department of Transportation (WYDOT) performs routine application of pavement markings, there is a pressing need for a comprehensive management program to ensure their cost-effective management. So, this report focu ...
  • Modifying Existing Asphalt Mix Design Procedures for RAPRAS Surface Mixtures
    Modifying Existing Asphalt Mix Design Procedures for RAP/RAS Surface Mixtures
    Castorena, Cassie ;
    Underwood, Benjamin Shane
    2023-08-01 | PDF
    The NCDOT mixture design procedure assumes 100 percent of the binder contained within reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) is available for blending with virgin asphalt. However, the literature shows that this assumption is flawed due to the presence of recycled asphalt material (RAM) agglomerations that prevent comp ...
  • Economic Effect of Active Transportation Features and the Association Between the Healthcare Industry and Transportation
    Economic Effect of Active Transportation Features and the Association Between the Healthcare Industry and Transportation
    Dunlop, Steven R ;
    Ukkusuri, Satish
    2023-08-01 | PDF
    The goal of this project is to help INDOT determine the economic effects of active transportation features, the impact of transportation infrastructure on the healthcare industry, and to explore a potential relationship between active transportation and healthcare. To capture the details thoroughly, the analysis was done at a macro and micro level. ...
  • Effect of AggregateBinder Compatibility on Performance of Asphalt Mixtures in Arkansas
    Effect of Aggregate-Binder Compatibility on Performance of Asphalt Mixtures in Arkansas
    Hossain, Zahid ;
    Braham, Andrew
    2023-08-01 | PDF
    The main objectives of this study were to assess compatibility among different types of binders and aggregates and to determine the maximum amount of sandstone aggregates in asphalt concrete surface mix (ACHM). To this end, three Performance Grade (PG) binders (PG 64-22, PG 70-22, and PG 76-22), each from six different sources were evaluated in the ...
  • Design of Stormwater BMPs for Surface and Groundwater Protection Based on SiteScale Soil Properties Phase I
    Design of Stormwater BMPs for Surface and Groundwater Protection Based on Site-Scale Soil Properties: Phase I
    Kibler, Kelly M. ;
    Chambers, Lisa
    2023-08-01 | PDF
    Phase I of this research developed experimental methodologies to quantify and compare the rates and means of nitrogen and phosphorus transformations through diverse soil profiles. Six sites were selected for study from areas of distinct geologic history in Florida. Soils from the six sites were chosen to represent a gradient of clay and organic mat ...
  • Rural Intersections within Passing Lanes
    Rural Intersections within Passing Lanes
    Fitzpatrick, Kay ;
    Brewer, Marcus A.
    2023-08-01 | PDF
    Super 2 highways are used across Texas to provide passing opportunities and increase capacity on rural two-lane roads, but passing lanes are a treatment for through vehicles and do not address the needs of turning vehicles. This project investigated the operational and safety benefits of turning treatments on two-lane and Super 2 corridors, as well ...
  • Strategies to Preserve Transitaccessible Affordable Housing in Southern California
    Strategies to Preserve Transit-accessible Affordable Housing in Southern California
    Parker, Madeleine E.G ;
    Chapple, Karen
    2023-08-01 | PDF
    This report highlights risk and prioritization factors for housing developments with expiring affordability protections, focused on preserving transit-accessible affordable housing. It presents a regional framework for identifying and preserving subsidized affordable housing in the Southern California Association of Governments (SCAG) region (Los A ...
  • Implementation of Electrical Resistivity Imaging Manual
    Implementation of Electrical Resistivity Imaging Manual
    Shahandashti, Mohsen ;
    Hossain, Sahadat
    2023-08-01 | PDF
    Texas Department of Transportation (TxDOT) annually encounters a substantial number of claims and change orders that have a detrimental effect on project costs and schedules. State Departments of Transportation (DOTs) spend approximately $10 million annually on geotechnical-related change orders, accounting for about 7% of the total expenditures as ...
  • Traffic Safety Facts Motorcycle Helmet Use in 2022Overall Results
    Traffic Safety Facts: Motorcycle Helmet Use in 2022—Overall Results
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    Use of DOT-compliant motorcycle helmets was 66.5 percent in 2022, not statistically different at the 0.05 level from 64.9 percent in 2021. This result is from the National Occupant Protection Use Survey (NOPUS), the only survey that provides nationwide, probability-based, observed data on motorcycle helmet use in the United States. The 2022 data co ...
  • Developing a Prototype System for Establishing Passing and NoPassing Zones of TwoLane Highways
    Developing a Prototype System for Establishing Passing and No-Passing Zones of Two-Lane Highways
    Farid, Ahmed ;
    Connell, Zephaniah
    2023-08-01 | PDF
    Two-lane highways comprise a considerable percentage of the nation’s roads. A critical component required in the design of two-lane highways is the passing sight distance (PSD). In cases where it is inadequate, no-passing zones are established. There are multiple techniques that are employed for measuring the PSD in the field and the Wyoming Depart ...
  • Smart Connected and Automated Vehicle Fleet Management Developing Regional Dispatch Decision Support for Congestion Mitigation
    Smart Connected and Automated Vehicle Fleet Management: Developing Regional Dispatch Decision Support for Congestion Mitigation
    Cummings, M ;
    Rouphail, Nagui M.
    2023-08-01 | PDF
    With the arrival of new technologies like connected and self-driving autonomous vehicles (AVs), the workload of regional dispatchers will increase. To this end, the CADS (Congestion Alerting Decision Support) tool was developed to support strategic transportation planning (on the order of weeks to months) and tactical transportation planning (on th ...
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