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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 1421 - 1440 of 35452 results
  • USFCUTR I4 FRAME Project Before Study Data Collection and Analysis of Safety and Mobility Conditions Prior to Implementation Summary
    USF-CUTR I-4 FRAME Project “Before” Study: Data Collection and Analysis of Safety and Mobility Conditions Prior to Implementation [Summary]
    Ponnaluri, Raj ;
    Lin, Pei-Sung
    2023-09-01 | PDF
    Florida Department of Transportation (FDOT) Interstate 4 (I-4) Florida’s Regional Advanced Mobility Elements (FRAME) project is of strategic importance to FDOTs’ Emerging Technologies and Connected Vehicle implementations and covers FDOT Districts 1,5,7 and Florida Turnpike Enterprise. The project has been let, with procurement of ITS systems under ...
  • Determining Bearing Resistance of Cantilever Sheet Piles Summary
    Determining Bearing Resistance of Cantilever Sheet Piles [Summary]
    Castellanos, Juan ;
    Song, Xiaoyu
    2023-09-01 | PDF
    Steel sheet pile walls have become a fixture of bridge construction. They are lightweight, meet foundational requirements, are corrosion resistant, and may be used for both temporary and permanent installation. However, in Florida, sheet pile walls are currently used for horizontal/lateral loads only.
  • 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 ...
  • 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 ...
  • Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method
    Sensitivity Analysis of the IDEAL CT Test Using the Distinct Element Method
    Saadeh, Shadi ;
    El Asmar, Maria
    2023-09-01 | PDF
    Cracking is a primary mode of failure for asphalt concrete (AC), resulting in road damage and deterioration, and leading to an increase in road hazards and fatalities. Studying the fracture behavior of AC is an effective way to learn how to best enhance their cracking resistance. To do this, the indirect tensile cracking laboratory test (IDEAL-CT) ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Developing Smart Signs for Traffic Control in Work Zones Summary
    Developing Smart Signs for Traffic Control in Work Zones [Summary]
    Sandberg, Wayne ;
    Morris, Nichole
    2023-09-01 | PDF
    Providing traffic control in work zones is one of the highest risk jobs in the country. Flaggers are often considered the first line of defense against distracted, inattentive or aggressive motorists who may intrude into these work areas.
  • Assurance of Machine LearningBased Aerospace Systems Towards an Overarching PropertiesDriven Approach
    Assurance of Machine Learning-Based Aerospace Systems: Towards an Overarching Properties-Driven Approach
    Paul, Saswata ;
    Prince, Dan
    2023-09-01 | PDF
    Traditional process-based approaches of certifying aerospace digital systems are not sufficient to address the challenges associated with using Artificial Intelligence (AI) or Machine Learning (ML) techniques. To address this, agencies are evaluating an alternative Means of Compliance (MoC) called the Overarching Properties (OP). The goals for this ...
  • 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.
  • Performance Metric for Highway Avalanche Corridors
    Performance Metric for Highway Avalanche Corridors
    Gauthier, Dave ;
    Sala, Zac
    2023-09-01 | PDF
    A research project was initiated on behalf of the Colorado Department of Transportation (CDOT) and Transportation Avalanche Research Pool (TARP) to develop a metric for measuring the performance of highway avalanche management programs. The metric is meant to support resource allocation and other management decisions made by avalanche programs whil ...
  • Fargo Moorhead 2021 Travel Demand Model Update
    Fargo Moorhead 2021 Travel Demand Model Update
    Motuba, Diomo ;
    Faisal, Habib Muhammad
    2023-09-01 | PDF
    The Fargo Moorhead MPO’s (The F-M MPO) Travel Demand Model (TDM) is updated every five years to replicate new data and the advancements in state-of-the-art transportation modeling methods and techniques. The original timeline for the current model was set for 2020. However, due to COVID-19, travel patterns changed because of travel restrictions and ...
  • 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 ...
  • Traffic Safety Facts 2021 Data 2021 State Traffic Data
    Traffic Safety Facts 2021 Data: 2021 State Traffic Data
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-09-01 | PDF
    Traffic fatalities in the United States increased by 10 percent from 2020 to 2021 (39,007 to 42,939). The fatality rate per 100 million vehicle miles traveled (VMT) was 1.37 in 2021, ranging from a high of 2.08 to a low of 0.71 among States. The rate of traffic fatalities per 100 million VMT in the United States increased by 2 percent (1.34 to 1.37 ...
  • 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 ...
  • 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 ...
  • Snowplow Route Optimization for the Kansas Roadway System
    Snowplow Route Optimization for the Kansas Roadway System
    Tran, Dan ;
    Nguyen, Phuong
    2023-09-01 | PDF
    State departments of transportation (DOTs) spend substantial resources on snow and ice control activities and operations each year. The Kansas DOT (KDOT) spends from $7 million to $22 million annually. KDOT winter maintenance operations currently deploy a fleet of 591 snowplow trucks, including 1,182 drivers and approximately 200 engineering techni ...
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