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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 2861 - 2880 of 35959 results
  • Use of Smart Rocks to Improve Rock Slope Design
    Use of Smart Rocks to Improve Rock Slope Design
    Benoit, Jean ;
    Souza, Bruma
    2022-03-01 | PDF
    Rock slopes pose a hazard to the traveling public when weathering processes dislodge portions of the slope that can fall into the road. Both the design of new rock slopes and the hazard assessment of existing rock slopes need improvement to increase safety against rockfall, construct better engineered slopes and reduce short-and long-term maintenan ...
  • Pavement Performance Curves Modeling Pavement Deterioration for SCDOT
    Pavement Performance Curves: Modeling Pavement Deterioration for SCDOT
    Huynh, Nathan ;
    Gassman, Sarah
    2022-02-28 | PDF
    The current SCDOT pavement performance models were formulated in 1989 by PMS Inc. (now known as Stantec) with assistance from SCDOT personnel, and they were based on engineering experience of pavement performance in South Carolina. Since their initial development, the parameters of the adopted sigmoidal, or S-shaped, function have not been updated. ...
  • A Review of Floridas FC5 Raveling Condition Assessment and Measurement Methods
    A Review of Florida’s FC-5 Raveling Condition Assessment and Measurement Methods
    Tsai, Yichang (James) ;
    Hsieh, Yung-An
    2022-02-28 | PDF
    While open-graded friction course (OGFC) mixtures, called FC-5 in the Florida Department of Transportation (FDOT), provide several safety benefits, their lives are limited to approximately 14 years on average in Florida. The reduced life is generally due to raveling, which rapidly deteriorates once initiated. In FDOT, raveling is rolled up into the ...
  • MultiScale MultiSeason LandBased Erosion Modeling and Monitoring for Infrastructure Management
    Multi-Scale Multi-Season Land-Based Erosion Modeling and Monitoring for Infrastructure Management
    Wang, Bin ;
    Snow, Christopher
    2022-02-25 | PDF
    In the New England region, roadways located within “erosion-prone zones” have been the main sources of erosion-induced road damage, particularly when major storms occur. With recent and continuing climate change influencing weather patterns (specifically causing an increase in high-intensity rainfall events, and rainfall events following snow event ...
  • Calibration of HSM Predictive Methods on State and Local Rural Highways
    Calibration of HSM Predictive Methods on State and Local Rural Highways
    Qin, Xiao ;
    Chen, Zhi
    2022-02-22 | PDF
    Performance-based safety goals and objectives are more attainable with the use of the Highway Safety Manual (HSM). However, the safety performance functions (SPFs) in the HSM are not accurate because they are not calibrated to local conditions. Additionally, each SPF and crash modification factor (CMF) assumes a set of base site conditions which mi ...
  • Review of State DOT Practices for Analyzing the Effectiveness of Completed Highway Safety Improvement Projects
    Review of State DOT Practices for Analyzing the Effectiveness of Completed Highway Safety Improvement Projects
    Steever, Megan
    2022-02-22 | PDF
    The South Dakota Department of Transportation (SDDOT) sought to enhance its safety program by investigating different methods of evaluating completed highway safety improvement projects. As a first step, the researcher completed a comprehensive literature review, using the results to develop a state survey. Upon approval of the state survey by the ...
  • Authorship Policy Memorandum
    Authorship Policy [Memorandum]
    Everett, Thomas D.
    2022-02-22 | PDF
    This Policy will ensure that Federal Highway Administration staff and individuals that make substantial intellectual contributions to scientific and technical products such as, but not limited to, the American Concrete Institute Journals, American Journal of Physics, American Society of Civil Engineers, Institute of Electrical and Electronics Engin ...
  • Motor Vehicle Service Delivery Analysis of Idahos Model and Policy Alternatives
    Motor Vehicle Service Delivery: Analysis of Idaho’s Model and Policy Alternatives
    Osterhout, Gabe ;
    May, Matthew
    2022-02-18 | PDF
    This report analyzes Idaho’s DMV service delivery model, compares it to DMV arrangements in other states, and considers potential policy alternatives by conducting surveys of front-line agents in Idaho and DMV administrators in other states, as well as interviews of officials in counties and other states. The report discusses the benefits and chall ...
  • Ecological Design Rules for Roadway Lighting Factsheet
    Ecological Design Rules for Roadway Lighting [Factsheet]
    Sulliván, Mažeika Patricio ;
    Gray, Suzanne M
    2022-02-10 | PDF
    Artificial lighting at night alters natural patterns of light and dark in ecosystems and includes chronic or periodic illumination, unexpected changes in lighting, and direct glare that can have serious implications for ecological systems, such that it is increasingly referred to as “ecological light pollution”. ALAN occurs at an extent and magnitu ...
  • Retrofit Design of the New Manual for Assessing Safety Hardware MASH TL4 Alaska 2Tube Bridge Rail
    Retrofit Design of the New Manual for Assessing Safety Hardware (MASH) TL-4 Alaska 2-Tube Bridge Rail
    Williams, William ;
    Lee, Judong
    2022-02-10 | PDF
    Many of bridges in the United States are obsolete with respect to the updated AASHTO strength requirements and the safety performance criteria stated in MASH. Many of these bridges utilize a wide concrete curb with a post and bridge rail system. Often, it is not economically feasible to completely replace the obsolete bridge rails with newer MASH c ...
  • Professional Drivers Automobile Debt and Financial Support During the COVID19 Pandemic
    Professional Drivers: Automobile Debt and Financial Support During the COVID-19 Pandemic
    Wasserman, Jacob L. ;
    Siddiq, Fariba
    2022-02-01 | PDF
    This report synthesizes three primary data sources—credit data, unemployment claims data, and small business loan and grant data—to explore the financial conditions of those who drive for a living before and during the COVID-19 pandemic in California. Automobile debt was high among groups likely to contain professional drivers. The occupational cat ...
  • Congestion Costs and Scheduling Preferences of Car Commuters in California Estimates Using Big Data
    Congestion Costs and Scheduling Preferences of Car Commuters in California: Estimates Using Big Data
    Kim, Jinwon ;
    Moon, Jucheol
    2022-02-01 | PDF
    On average, California car commuters waste 4–5 minutes per morning commute due to congestion. Multiplied across all California car commuters, those few minutes entail a yearly total of approximately 2.3 billion hours of time wasted, costing 6 billion dollars. The objective of this study is to quantify congestion costs and determine how commuters ad ...
  • An Assessment of how State and Regional Transportation Agencies Advance Equity in Transportation Plans Processes and Implementation
    An Assessment of how State and Regional Transportation Agencies Advance Equity in Transportation Plans, Processes, and Implementation
    Barajas, Jesus M. ;
    Natekal, Asiya
    2022-02-01 | PDF
    To provide California with recommendations for how to advance transportation equity, this study examines how state DOTs and metropolitan planning organizations (MPOs) are implementing equity-based planning. The research team conducted a content analysis on the long-range transportation plans (LRTPs) and active transportation plans of six state DOTs ...
  • Influence of Internal Curing on Concretes Permeability in Simulated Field Conditions Research Project Capsule 221C
    Influence of Internal Curing on Concrete’s Permeability in Simulated Field Conditions: Research Project Capsule [22–1C]
    Milla, Jose ;
    Rupnow, Tyson
    2022-02-01 | PDF
    The objective of this study is two-fold. The first objective is to assess the influence of internal curing on concrete’s transport properties using appropriate curing conditions. The second objective is to validate the surface resistivity results with bulk diffusion testing.
  • Understanding the Impact of Decentralizing Homeless Services on Transportation and Mobility in Salt Lake County
    Understanding the Impact of Decentralizing Homeless Services on Transportation and Mobility in Salt Lake County
    Canham, Sarah L ;
    Rose, Jeffryd
    2022-02-01 | PDF
    In 2019, the delivery of homeless sheltering services in Salt Lake County transitioned from a centralized emergency shelter—The Road Home Salt Lake Community Shelter and Resource Center (TRHSLC)—operated by The Road Home to a decentralized, scattered site model with multiple “Homeless Resource Center” (HRC) locations operated by multiple service pr ...
  • The Impact of the Louisiana Grade Crossings A Synthesis and System Analysis
    The Impact of the Louisiana Grade Crossings: A Synthesis and System Analysis
    Tian, Guang ;
    Izadi, Maryam
    2022-02-01 | PDF
    Louisiana has over 3000 at-grade crossings of public roads with railroads. The number of private road/driveway crossings is unknown but likely exceeds the number of public crossings. In 2018, 91 grade crossing collisions were recorded, including six fatalities, in Louisiana. Although Louisiana has witnessed a decline in highway-rail crossing accide ...
  • Skew Detection System Replacement on Vertical Lift Bridges Phase II Research Project Capsule 222ST
    Skew Detection System Replacement on Vertical Lift Bridges (Phase II): Research Project Capsule [22–2ST]
    Rees, Gareth ;
    Rupnow, Tyson
    2022-02-01 | PDF
    The objective of this work is to prove a new technology system against the existing legacy skew-control technology on the Ellender Ferry Vertical Lift Bridge over the Intracoastal Waterway, located in Calcasieu Parish. The new skew technology shall be as recommended in the results of the Phase 1 study. The work will include design and installation ...
  • Development of Automated Pavement Condition Score and Decision Logic Fact Sheet
    Development of Automated Pavement Condition Score and Decision Logic [Fact Sheet]
    Stefanski, Joe ;
    Premkumar, Laxmikanth
    2022-02-01 | PDF
    Using data from 2015 and 2016 data collection cycles, covering over 13,000 pavement management sections, researchers studied possible methodologies for automating pavement ratings. Automated results were compared to manual ratings that ODOT conducted as part of their existing pavement management process.
  • Travel Behavior Impacts of Transportation Demand Management Policies May is Bike Month in Sacramento California
    Travel Behavior Impacts of Transportation Demand Management Policies: May is Bike Month in Sacramento, California
    Circella, Giovanni ;
    Alemi, Farzad
    2022-02-01 | PDF
    Active modes of transportation like bicycling and walking are extremely beneficial to society, including helping to reduce the amount of travel people may make by car (i.e., vehicle miles travelled) and in turn reducing congestion and transportation-related greenhouse gas emissions and air pollutants. Bicycling and walking also have direct and posi ...
  • In Situ Cyclic Loading of Concrete Pavement Overlays Supported on Geotextile and Asphalt Interlayers Buchanan County Road D16
    In Situ Cyclic Loading of Concrete Pavement Overlays Supported on Geotextile and Asphalt Interlayers: Buchanan County Road D-16
    White, David ;
    Taylor, Peter
    2022-02-01 | PDF
    Automated plate load tests (APLTs) were conducted on County Road (CR) D-16 in Buchanan County, Iowa, to assess and compare the performance of unbonded concrete overlay test sections with three different geotextile fabric interlayers. The pavement was constructed in 2020. Field testing was performed on the asphaltic cement concrete (ACC) pavement pr ...
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