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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 1721 - 1740 of 36104 results
  • 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) ...
  • 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 ...
  • Enhancing Freeway Safety Prediction Models Technical Report
    Enhancing Freeway Safety Prediction Models: Technical Report
    Pratt, Michael P. ;
    Geedipally, Srinivas R.
    2023-09-01 | PDF
    Safety prediction models have been developed for urban freeway segments in Texas and elsewhere to apply to cross sections up to 10 lanes wide. These models are documented resources such as TxDOT’s Roadway Safety Design Workbook and the Highway Safety Manual and applied in several spreadsheet-based analysis tools. These tools are acknowledged in the ...
    Supporting Files
  • Design and Behavior of Seamless BridgePavement Systems
    Design and Behavior of Seamless Bridge-Pavement Systems
    Chen, Xiaoyi ;
    Malviya, Jay
    2023-09-01 | PDF
    The seamless bridge concept eliminates expansion joints on the bridge deck and joints between the bridge and approach, which can significantly reduce the maintenance costs and improve the long-term durability of the primary load-carrying components. Past applications of seamless bridges have utilized Continuously Reinforced Concrete Pavement (CRCP) ...
  • Best Practices for Construction Site Stormwater Treatment Using Flocculants
    Best Practices for Construction Site Stormwater Treatment Using Flocculants
    Kazaz, Billur ;
    Clampitt, Jannell
    2023-09-01 | PDF
    Unmanaged construction stormwater runoff can pose a risk for the quality of downstream water bodies. Temporary sediment control practices are designed to capture sediment particles and reduce the turbidity of discharge; however, commonly used practices have limited performance in capturing fine-sized sediment particles. Flocculants can be introduce ...
  • Efficacy Costs and Impacts of NonChloride Deicers An Educational Primer and Product Information Sheets
    Efficacy, Costs, and Impacts of Non-Chloride Deicers: An Educational Primer and Product Information Sheets
    Fay, Laura ;
    Clouser, Karalyn
    2023-09-01 | PDF
    The objective of this project was to synthesize available information on non-chloride deicers to allow for a more comprehensive understanding by winter roadway maintenance professionals and allow for easy comparisons between products and with sodium chloride (as salt brine or rock salt). This was accomplished through a literature search that summar ...
  • Ohios Research Initiative for Locals ORIL Research OnCall Task 6 An Experimental Study on the Influence of Polyester Fibers Plastic Glass and Tire Waste on LowStrength Concrete Performance
    Ohio’s Research Initiative for Locals (ORIL) Research On-Call Task 6 – An Experimental Study on the Influence of Polyester Fibers, Plastic, Glass, and Tire Waste on Low-Strength Concrete Performance
    Khoury, Issam ;
    Green, Roger
    2023-09-01 | PDF
    Spearheaded by Defiance County, the research to develop a cost-efficient, flexible concrete mix was carried out by Ohio University's Departments of Civil and Environmental Engineering. The study explored the integration of locally-sourced waste materials—tire shreds, fiberglass, polyester fiber, and plastic waste—into the concrete mix. Rigorous tes ...
  • Snowplow Route Optimization for the Kansas Roadway System Technical Summary
    Snowplow Route Optimization for the Kansas Roadway System [Technical Summary]
    Tran, Dan ;
    Nguyen, Phuong
    2023-09-01 | PDF
    The objective of this project was to develop a snowplow truck route optimization plan for one district (District 4) to help KDOT enhance snow removal efficiency by justifying the fleet size and efficiently allocating limited resources while maintaining roadway safety and reliability.
  • 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.
  • 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 ...
  • Estimating PeakFlow Quantiles for Selected Annual Exceedance Probabilities in Illinois
    Estimating Peak-Flow Quantiles for Selected Annual Exceedance Probabilities in Illinois
    Over, Thomas M. ;
    Marti, Mackenzie K
    2023-09-01 | PDF
    This report presents the methods, results, and applications of an updated flood-frequency study for the State of Illinois. This study, which uses data through September 2017, updates two previous studies that used data through 1999 and 2009, respectively. Flood-frequency estimates are used for a variety of land-use planning and infrastructure desig ...
  • STAR InRoad Electric Vehicle Charging for Parked Vehicles
    STAR In-Road Electric Vehicle Charging for Parked Vehicles
    Abdulhamed, Bilal ;
    Alavizadeh, Hootan
    2023-09-01 | PDF
    This report documents the work conducted as a multi-disciplinary project on the wireless charging of parked Electrical Vehicles (EVs) by Wright State University and supported by the Ohio Department of Transportation (ODOT). This document summarizes our progress on a wide variety of topics, including 1) in-house software to read and label the open-s ...
  • 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 ...
  • 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.
  • Evaluating Michigans Ferry Services Funding and Policies to Support Island Access Research Spotlight
    Evaluating Michigan’s Ferry Services, Funding and Policies to Support Island Access [Research Spotlight]
    Zockaie, Ali ;
    Shultz, Valerie
    2023-09-01 | PDF
    The Michigan Department of Transportation (MDOT) oversees ferry service for Michigan’s islands as part of its mission to provide safe and equitable access to state residents. To identify ways to improve service to island residents now and in the future, MDOT sought a more comprehensive understanding of the critical aspects of ferry service. This re ...
  • Connected and Automated Future of Transportation for Kansas Technical Summary
    Connected and Automated Future of Transportation for Kansas [Technical Summary]
    Aziz, H.M. Abdul ;
    Islam, A.M. Hasibul
    2023-09-01 | PDF
    The connected and automated vehicle (CAV) technologies will bring unprecedented changes in the landscape of transportation systems for areas like operations, management, and infrastructure needs. To assure a safe, reliable, and trustworthy connected and automated transportation system, it is important to have a clear CAV implementation pathway that ...
  • Connected Vehicle Application Development
    Connected Vehicle Application Development
    Zhou, Kun
    2023-09-01 | PDF
    Connected Vehicle (CV) communication technology (i.e., Vehicle-to-Everything, V2X) enables vehicles to "talk" to other vehicles on the road (Vehicle-to-Vehicle, V2V), roadside infrastructure (Vehicle-to-Infrastructure, V2I), vulnerable road users (Vehicle-to-Pedestrian, V2P), and the "cloud" (vehicle-to-network, V2N). The V2X connectivity will prov ...
  • Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements Fact Sheet
    Identification of Enhanced Moisture Susceptibility Testing for Asphalt Pavements [Fact Sheet]
    Green, Roger ;
    Rodezno, Carolina
    2023-09-01 | PDF
    Over the years, efforts have been made to identify test procedures with appropriate moisture conditioning methods to quantify the potential of moisture susceptibility in asphalt mixtures. Some of the most commonly used test procedures include Modified Lottman Test (AASHTO T 283), Hamburg Wheel-Track Test (AASHTO T 324), and visual strip rating test ...
  • Connected and Automated Future of Transportation for Kansas
    Connected and Automated Future of Transportation for Kansas
    Aziz, H.M. Abdul ;
    Islam, A.M. Hasibul
    2023-09-01 | PDF
    The connected and automated vehicle (CAV) technologies will bring unprecedented changes in the landscape of transportation systems for areas like operations, management, and infrastructure needs. To assure a safe, reliable, and trustworthy connected and automated transportation system, it is important to have a clear CAV implementation pathway that ...
  • 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 ...
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