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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 2161 - 2180 of 36873 results
  • Traffic Control Device Analysis Testing and Evaluation Program FY2022 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY2022 Activities
    Finley, Melisa D. ;
    Venglar, Steven P.
    2023-08-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. This project provides the Texas Department of Transportation with a mechanism to conduc ...
  • Synthesis Develop Guidance for Local Government Building Codes for Bridges
    Synthesis: Develop Guidance for Local Government Building Codes for Bridges
    Shahandashti, Mohsen ;
    Chao, Shih-Ho (Simon)
    2023-08-01 | PDF
    The design, construction, and maintenance of off-system bridges vary across local governments (cities and counties), often resulting in inferior performance compared to bridges managed by state highway agencies. Limited knowledge of local government practices hinders understanding of the factors contributing to these deficiencies and poses challeng ...
  • Improving Multimodal Traffic Safety for MultiLane Arterials Summary
    Improving Multimodal Traffic Safety for Multi-Lane Arterials [Summary]
    Young, Brenda ;
    Abdel-Aty, Mohamad
    2023-08-01 | PDF
    This project sought to identify factors that impact crashes involving vulnerable road users and evaluate countermeasures that are most effective at managing speed on multi-lane arterials.
  • Ohio Department of Transportation District Highway Maintenance Research OnCall Task 07 Radar Emplacement Prediction Tool Exploration Recommendations
    Ohio Department of Transportation District Highway Maintenance Research On-Call Task 07: Radar Emplacement Prediction Tool Exploration & Recommendations
    Ramaswami, Adithya G ;
    McCrink, Matthew H
    2023-08-01 | PDF
    Emerging autonomous aircraft require unique infrastructure to provide vital information to ensure they remain well-clear of other flying objects. While there are many systems designed to provide such functionality, termed detect and avoid (DAA), ground-based radars have emerged as one of the most promising technical solutions to this challenging pr ...
  • Establishing a Repeatable Method for Presenting Nontraditional Traffic Treatments to Maximize Stakeholder Support
    Establishing a Repeatable Method for Presenting Nontraditional Traffic Treatments to Maximize Stakeholder Support
    Morris, N L ;
    Schwieters, K S
    2023-08-01 | PDF
    A novel infrastructure design known as the J-turn intersection reduces the risk of serious and fatal crashes at thru-STOP intersections through decreasing points of conflict at an intersection by restricting crossing movements from the minor road. Despite their demonstrated safety efficacy, J-turns have not been met with uniformly positive support. ...
  • Traffic Safety Facts 2021 Data Young Drivers
    Traffic Safety Facts 2021 Data: Young Drivers
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    In 2021 there were 2,116 young drivers who died in traffic crashes, an 11-percent increase from 1,899 in 2020. The number of licensed young drivers increased by 1.3 percent from 2020 to 2021. In 2021 there were an estimated 203,256 young drivers injured in traffic crashes, an increase of 7 percent from 189,959 in 2020. Young drivers accounted for 8 ...
  • Alternative Fuel Vehicle Usage and Owner Demographics in New York State An Analysis of 2017 National Household Travel Survey Data
    Alternative Fuel Vehicle Usage and Owner Demographics in New York State: An Analysis of 2017 National Household Travel Survey Data
    Pan, Meiyu (Melrose) ;
    Uddin, Majbah
    2023-08-01 | PDF
    With mounting concerns over climate change and the environmental impact of fossil fuels, the United States has witnessed a growing interest in alternative fuel vehicles (AFVs). In 2021, approximately 1.5 million battery EVs (BEVs), 0.8 million plug-in hybrid EVs (PHEVs), and 5.5 million hybrid EVs (HEVs) were registered in the United States. In the ...
  • 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 ...
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