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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 1741 - 1760 of 36104 results
  • Developing MassachusettsSpecific Trip Generation Models for Land Use Projects
    Developing Massachusetts-Specific Trip Generation Models for Land Use Projects
    Xie, Yuanchang ;
    Loesch, Brandon
    2023-09-01 | PDF
    Vehicle trip generation is used to identify potential transportation impacts associated with new development projects and to provide a substantive basis for determining appropriate impact mitigation strategies. In the United States, trip rate estimation typically relies on vehicle trip rates for specific land use types as provided in the Trip Gener ...
  • Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method Brief
    Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method [Brief]
    Saadeh, Shadi ;
    El Asmar, Maria
    2023-09-01 | PDF
    Cracking is a primary mode of failure for asphalt concrete (AC), resulting in extensive road damage and deterioration which significantly leads to an increase in road hazards and fatalities. Therefore, understanding and studying the fracture behavior of AC provides an effective pathway to learn how to best enhance their cracking resistance, effecti ...
  • Update the Pile Design by CPT Software to Incorporate Newly Developed PileCPT Methods and Other Design Features
    Update the Pile Design by CPT Software to Incorporate Newly Developed Pile-CPT Methods and Other Design Features
    Abu-Farsakh, Murad ;
    Amirmojahedi, Mohsen
    2023-09-01 | PDF
    This study presents the performance evaluation of 21 direct pile-CPT methods for estimating the ultimate load carrying capacity of square precast prestressed concrete (PPC) piles driven into Louisiana soils utilizing the cone penetration test (CPT) data. The investigated methods are: Schmertmann, De Ruiter and Beringen, Bustamante and Gianeselli (L ...
  • DDOT Pilot Framework
    DDOT Pilot Framework
    Ricks, Karina ;
    Bridgford, Camron
    2023-09-01 | PDF
    The District Department of Transportation (DDOT) has a long history of supporting innovative pilot projects in service of its mission of enhancing transportation efficiency, safety, and sustainability. Pilot projects are a means to explore innovative ideas, strategies, and technologies on a limited scale before full-scale implementation. They allow ...
  • Guidelines for Optimizing Roadway CrossSection on Texas Highways
    Guidelines for Optimizing Roadway Cross-Section on Texas Highways
    Brewer, Marcus A. ;
    Geedipally, Srinivas
    2023-09-01 | PDF
    This project compiled and reviewed existing road cross-section guidance (for urban, suburban, and rural environments) from across the United States, along with research findings, to identify content that would be appropriate for inclusion in Texas-based guidelines for road cross-section optimization. A separate project task focused on considering t ...
  • Lightweight Deflectometer for Quality Assurance of Compacted Sublayers and Earthwork
    Lightweight Deflectometer for Quality Assurance of Compacted Sublayers and Earthwork
    Simon, Doug P ;
    LaBelle, Jacqueline
    2023-09-01 | PDF
    This report documents and presents the results of a study for implementation of lightweight deflectometer (LWD) testing for construction Quality Assurance (QA) in Alaska. The research evaluated empirical values, control strip testing, and laboratory testing to determine LWD target values. The results indicate control strip testing is the preferred ...
  • Update the Pile Design by CPT Software to Incorporate Newly Developed PileCPT Methods and Other Design Features Tech Summary
    Update the Pile Design by CPT Software to Incorporate Newly Developed Pile-CPT Methods and Other Design Features [Tech Summary]
    Abu-Farsakh, Murad ;
    Zhang, Zhongjie
    2023-09-01 | PDF
    This study presents the current research effort undertaken to identify the top-performed pile-CPT methods for accurately estimating the ultimate capacity of piles driven into Louisiana soils. Statistical analysis, Multidimensional Unfolding (MDU), and reliability analysis criteria were used to investigate the performance of 21 pile-CPT methods. The ...
  • An Evaluation of Wildlife Crossing Design Placement Costs and Funding Opportunities for Corridor Q
    An Evaluation of Wildlife Crossing Design, Placement, Costs, and Funding Opportunities for Corridor Q
    Donaldson, Bridget M ;
    Hillard, Elizabeth M
    2023-09-01 | PDF
    Construction is underway along Corridor Q, a 14-mile section of highway in Southwest Virginia that will open to traffic in stages from 2023 to 2027. Preliminary data indicated that a newly established reintroduced herd of elk regularly travels on and alongside the partially constructed road. The purpose of this study was to determine potential desi ...
  • Improving Design and Construction of Transportation Infrastructure through Bedrock Characterization 2023
    Improving Design and Construction of Transportation Infrastructure through Bedrock Characterization [2023]
    Ng, Kam W. ;
    Khatri, Lokendra
    2023-09-01 | PDF
    Tertiary bedrock formations are commonly encountered during the design and construction of transportation infrastructure in Wyoming. The engineering properties of these bedrocks are highly variable due to the geological processes to which they have been subjected including deposition, cementation, weathering and erosion. Furthermore, comprehensive ...
  • Optimizing of MassDOTs High Performance Asphalt Overlay HPOL Mixtures
    Optimizing of MassDOT’s High Performance Asphalt Overlay (HPOL) Mixtures
    Mogawer, Walaa S. ;
    Austerman, Alexander J.
    2023-09-01 | PDF
    The FHWA Targeted Overlay Pavement Solutions (TOPS) program presents innovative overlay solutions for asphalt and concrete pavements. The objective of this study was to conduct a comparative evaluation of three TOPS types for asphalt pavements (Asphalt Rubber Gap-Graded, Stone Matrix Asphalt, and High-Performance thin overlay) in terms of performan ...
  • US Department of Transportation Equity Action Plan 2023 Update
    U.S. Department of Transportation Equity Action Plan 2023 Update
    United States. Department of Transportation
    2023-09-01 | PDF
    DOT is committed to pursuing a comprehensive approach to advancing equity for all. The first DOT Equity Action Plan, in response to Executive Order 13985, was finalized in January 2022 as a major milestone for the Department that represented a shift in how the agency exercises its existing authorities and delivers transportation programs. Executive ...
  • Analysis of Benefits of UDOTs Expanded Incident Management Team Program
    Analysis of Benefits of UDOT’s Expanded Incident Management Team Program
    Schultz, Grant G. ;
    Hyer, Joel
    2023-09-01 | PDF
    In 2019, the Utah Department of Transportation (UDOT) funded a research study evaluating the performance measures of UDOT’s expanded Incident Management Team (IMT) program. The number of IMTs patrolling Utah roadways increased from 13 to 25 between 2018 and 2020. Crash data were collected from the Utah Highway Patrol’s Computer Aided Dispatch datab ...
  • Reducing Concrete Cure Times for Bridge Substructure Components and Box Culverts
    Reducing Concrete Cure Times for Bridge Substructure Components and Box Culverts
    Qadri, Faisal ;
    Garg, Nishant
    2023-09-01 | PDF
    This report investigated pathways to reduce concrete curing time while maintaining mechanical and durability performance. Among several options such as admixtures, supplementary cementitious materials, and low water-to-cement ratio, researchers explored two mix designs in a field demonstration project. For Stage I of the project, a low water-to-cem ...
  • GeoStatistical Deep Foundation Software Summary
    Geo-Statistical Deep Foundation Software [Summary]
    Herrera, Rodrigo ;
    Davidson, Michael
    2023-09-01 | PDF
    The objectives of this project were twofold: 1) to update GeoStat—the current geotechnical design software used by FDOT—to include site-specific considerations and 2) to hold demonstration sessions on using the updated software for in-house personnel as well as consultants.
  • 07146 Develop Guidance for Local Government Building Codes for Bridges
    0-7146: Develop Guidance for Local Government Building Codes for Bridges
    Shahandashti, Mohsen ;
    Chao, Shih-Ho (Simon)
    2023-08-31 | 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 ...
  • Determine the Influence of Thermal Segregation on Current Asphalt Mixtures Project Summary
    Determine the Influence of Thermal Segregation on Current Asphalt Mixtures [Project Summary]
    Sebesta, Stephen ;
    Kim, Jinho
    2023-08-31 | PDF
    Researchers conducted a comprehensive literature review to gather information on thermal segregation in asphalt mixes. Various hardware systems, specifications, and previous research studies were summarized and documented to understand the existing knowledge on the subject.
  • Automated IDEAL Cracking and Rutting Tests Project Summary
    Automated IDEAL Cracking and Rutting Tests [Project Summary]
    Zhou, Fujie ;
    Roa, Jorge
    2023-08-31 | PDF
    The researchers developed the Asphalt Mixture Automated Testing System with Zero Intervention (AMAZE), shown in Figure 1. The AMAZE includes five units: • An air voids measurement unit. • A specimen storage unit. • Two temperature conditioning units, one for room temperature and the other for high temperature (e.g., 50 °C). • A material testing loa ...
  • Develop Enhanced Protection of Median Openings Between Parallel Bridge Structures Project Summary
    Develop Enhanced Protection of Median Openings Between Parallel Bridge Structures [Project Summary]
    Kovar, James C. ;
    Bligh, Roger
    2023-08-31 | PDF
    The objective of this project was to develop a median opening protection system (MOPS) suitable for implementation in sloped medians between parallel bridges. One primary goal was to use currently available technologies to speed implementation. The MOPS was intended to prevent motorists from experiencing these roadway departure crashes between para ...
  • Develop Standardized Operational Evaluation of WrongWay Driving Detection Technologies Project Summary
    Develop Standardized Operational Evaluation of Wrong-Way Driving Detection Technologies [Project Summary]
    Finley, Melisa D. ;
    Venglar, Steven P.
    2023-08-31 | PDF
    From 2010 to 2019, approximately 1700 wrong-way driving (WWD) crashes occurred in Texas on controlled-access highways (e.g., freeways and interstates). On average, about 170 WWD crashes occurred each year, and 10 percent resulted in a fatality. To reduce the number of wrong-way (WW) maneuvers and associated crashes on Texas freeways, the Texas Depa ...
  • Traffic Control Device Analysis Testing and Evaluation Program Project Summary
    Traffic Control Device Analysis, Testing, and Evaluation Program [Project Summary]
    Finley, Melisa D. ;
    Habermann, John
    2023-08-31 | PDF
    Evaluating the numerous types of traffic control devices (TCDs) newly available and installed across Texas roadways is a key for the Texas Department of Transportation (TxDOT) to maintain roadway safety and proper performance of TCDs. Evaluations are also needed in order to cost-effectively implement new devices and technologies for continual impro ...
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