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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 4921 - 4940 of 36020 results
  • Mitigation of Cracking in Florida Structural Concrete
    Mitigation of Cracking in Florida Structural Concrete
    Tia, Mang ;
    Subgranon, Thanachart
    2020-02-01 | PDF
    A laboratory study was conducted to evaluate the possible beneficial effects of incorporating shrinkage-reducing admixture (SRA), polymeric microfibers (PMF), and optimized aggregate gradation (OAG) in internally cured concrete (ICC) mixes. Two sets of test slabs using ICC mixes in concrete pavement slab application were also conducted. All the ICC ...
  • Immersive Work Zone Inspection Training Using Virtual Reality
    Immersive Work Zone Inspection Training Using Virtual Reality
    Edara, Praveen ;
    Sun, Carlos
    2020-02-01 | PDF
    Can virtual reality tools be used to train engineers that inspect work zones? In this report, we share the findings of a research project that developed an interactive and immersive training platform using virtual reality to train state department of transportation (DOT) staff that inspect work zones for compliance. Virtual reality offers an immers ...
  • Development of SelfCleaning Box Culvert Design Phase III Tech Brief
    Development of Self-Cleaning Box Culvert Design Phase III [Tech Brief]
    Muste, Marian
    ORCID ICON IMG
    2020-02-01 | PDF
    The main objectives of this research are: a) Implementation of the self-cleaning Design A in the downstream area of the FHWA #031711 culvert using guidelines developed through previous TR 619 research. b) Monitoring and assessing the overall pre-construction behavior of the FHWA #364790 located immediately downstream the FHWA #031711 culvert. c) De ...
  • Analyze and Validate Bearing Pressure Requirements for Truncated Base MechanicallyStabilized EarthGeosyntheticallyReinforced Soil GRS Walls
    Analyze and Validate Bearing Pressure Requirements for Truncated Base Mechanically-Stabilized Earth/Geosynthetically-Reinforced Soil (GRS) Walls
    Chang, Nien-Yin ;
    Nghiem, Hien Manh
    2020-02-01 | PDF
    Truncated base mechanically-stabilized earth (MSE) walls are the MSE walls with narrow base excavation length and steep excavation slope designed to save construction cost while pushing the technological envelope of geosynthetic reinforcement development. A wall with truncated geometry of a narrow base length and steep excavation slope can signific ...
  • Cambridge Clean Fleet Initiative Technical Assistance for Selected Special Applications of Clean Fleet Technologies
    Cambridge Clean Fleet Initiative: Technical Assistance for Selected Special Applications of Clean Fleet Technologies
    Epstein, Alexander K. ;
    Cutler, Chris
    2020-02-01 | PDF
    Advanced technology solutions underpin the 2030 Target for the Clean Fleet Initiative, based onexpectations that these technologies will be implementable in a wide range of City vehicles. Within the target vehicle population, a number of special applications have been identified that need additional research to anticipate and mitigate potential imp ...
  • GIS Tools and Apps Integration With Asset Management
    GIS Tools and Apps – Integration With Asset Management
    Morris, Cinde ;
    Theroux, Annette
    2020-02-01 | PDF
    Asset management is critical for local and state governments to not only track assets but to also plan for maintenance of assets that will provide the greatest return on investment for the agency. The use of geographic information system (GIS) applications, tools and geospatial data can provide agencies with the most accurate inventory of assets, a ...
  • Analysis and Assessment of the Reimbursement Rates and Mechanisms for Kentuckys Publicly Funded Ferries
    Analysis and Assessment of the Reimbursement Rates and Mechanisms for Kentucky’s Publicly Funded Ferries
    Marks, P Gayle ;
    Gibson, Bryan
    2020-02-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) reimburses publicly operated ferries, including when they cease operations due to severe weather or unforeseen events. Reimbursement procedures are not codified in law and are largely based on historical practice. To determine how the Cabinet should handle reimbursement, funding, oversight of ferry service ...
  • Supporting Pavement Maintenance Decisions of LowVolume Roads In Colorado Using Optimization Analysis and ArtificialIntelligence Techniques
    Supporting Pavement Maintenance Decisions of Low-Volume Roads In Colorado Using Optimization Analysis and Artificial-Intelligence Techniques
    Hafez, Marwan ;
    Ksaibati, Khaled
    2020-02-01 | PDF
    States’ Departments of Transportation (DOT) are trying to utilize the best practices of managing low-volume roads (LVRs) due to limited resources and declined transportation funding. Diverse maintenance practices and fluctuating budget allocations are noticed on LVRs which significantly impact the overall pavement performance. In this study, the op ...
  • Evaluation of UltraHigh Performance Concrete Fiber Reinforced SelfConsolidating Concrete and MALP Concrete for Prestressed Girder Repair
    Evaluation of Ultra-High Performance Concrete, Fiber Reinforced Self-Consolidating Concrete, and MALP Concrete for Prestressed Girder Repair
    Floyd, Royce ;
    Volz, Jeffery S.
    2020-02-01 | PDF
    Ultra-high performance concrete (UHPC), fiber-reinforced self-consolidating concrete, and magnesium-alumino-liquid-phosphate (MALP) concrete all have significant potential for use in bridge repair in Oklahoma. The project described in this report examined the use of these materials in repairs of prestressed concrete girder continuity connections an ...
  • Design and Construction of an Integrated Solar Lighting Pedestrian Crosswalks and Sidewalks with Enhanced Visibility
    Design and Construction of an Integrated Solar Lighting Pedestrian Crosswalk(s) and Sidewalks with Enhanced Visibility
    Scheffe, Jonathan
    2020-02-01 | PDF
    In this project, photoluminescent stones and solar photovoltaic modules by Wattway were investigated as a means to provide lighting to pedestrian areas and heavily trafficked roadways/pathways. The photovoltaic modules by Wattway were not able to be delivered as scheduled because of manufacturing defects and thus this phase of the project was put o ...
  • E3 Evaluating Equity in Evacuation A Practical Tool and a Case Study
    E3: Evaluating Equity in Evacuation: A Practical Tool and a Case Study
    Cirillo, Cinzia ;
    Nejad, Mohammad M
    2020-02-01 | PDF
    Natural or man-made hazards that require evacuation put already vulnerable populations in a more precarious situation. When plans and decisions about evacuation are made, access to a private car is typically assumed, and differences in income levels across a community are rarely taken into account. The result is that carless members of a community ...
  • A Smart Growth Equity Framework and Tool for Measuring Understanding and Realizing Transportation Land Use Coordination for Sustainability Livability and Equity
    A Smart Growth & Equity Framework and Tool for Measuring, Understanding, and Realizing Transportation Land Use Coordination for Sustainability, Livability, and Equity
    Appleyard, Bruce S. ;
    Allen, Christopher J.
    2020-02-01 | PDF
    The coordination and integration of transportation and land use (also known as “smart growth”) has been a long-standing goal for planning and engineering professionals, but to this day remains an elusive concept to realize. As this approach is a widely recognized as key to achieving sustainable, livable, and equitable (SLE) outcomes for individuals ...
  • Dynamic and Static Load Testing Bridge No HAM751292 Shepherd Lane over I75 Static Load Test
    Dynamic and Static Load Testing Bridge No. HAM-75-1292 Shepherd Lane over I-75 Static Load Test
    Narsavage, Peter
    ORCID ICON IMG
    2020-02-01 | PDF
    A static load test was performed at the foundation for the north pier of proposed Bridge No. HAM-751292 in Cincinnati, Ohio. The bridge carries Shepherd Lane over I-75. The piles are 14-inch diameter pipe piles, driven with a plate covering the pile tip and then filled with concrete. The ultimate bearing value (UBV) is 226 kips. This corresponds to ...
  • Adding Carbon to the Equation in Online Flight Search
    Adding Carbon to the Equation in Online Flight Search
    Amenta, Nina ;
    Sanguinetti, Angela
    2020-02-01 | PDF
    This study explores the potential to promote lower-emissions air travel by providing consumers with information about the carbon emissions of alternative flight choices in the context of online flight search and booking. Researchers surveyed over 450 UC Davis faculty, researchers, and staff, asking them to choose among hypothetical flight options f ...
  • Iowa DOT Office of Maintenance Snowplow Optimization
    Iowa DOT Office of Maintenance Snowplow Optimization
    Dong, Jing ;
    Zhang, Luning
    2020-02-01 | PDF
    During winter road maintenance operations, the Iowa Department of Transportation (DOT) is responsible for servicing 24,000 lane miles of roadways, including Interstates, US highways, and Iowa roads. This project focused on operations for District 3, located in northwest Iowa, which services about 4,000 lane miles from 20 depots. Two optimization pr ...
  • Transportation and Land Use across US and Mexican Urban Areas
    Transportation and Land Use across US and Mexican Urban Areas
    Guerra, Erick ;
    Benitez, Juan Pablo
    2020-02-01 | PDF
    This report compares the socioeconomic factors, urban locations, and commute patterns of urban workers in the United States and Mexico. The US dataset contains information on 3.5 million commuters over 4 years of the American Community Survey (ACS) Public Use Microdata Sample (PUMS), representing 98 million workers in total in the 100 largest metro ...
  • Bond Performance of 1125 Inch Diameter Prestressing Strands
    Bond Performance of 1.125 Inch Diameter Prestressing Strands
    Pozo-Lora, Fray F ;
    Benson, Zachary
    2020-02-01 | PDF
    Experimental research addressing the bond performance, transfer and development length of 1-1/8 in. diameter grade 250 strands to concrete is presented in this report. Three different bond testing methodologies were employed to appraise the pullout force values of the strands in concrete and mortar, namely the Large Block Pullout Test (LBPT), the A ...
  • Understanding Behavioral Responses of Wildlife to Traffic to Improve Mitigation Planning
    Understanding Behavioral Responses of Wildlife to Traffic to Improve Mitigation Planning
    Shilling, Fraser M ;
    Collins, Amy
    2020-02-01 | PDF
    Creating and maintaining sustainable transportation systems depends in part on understanding and mitigating ecological impacts. Wildlife crossing structures (WCS) are often used to mitigate impacts on wildlife populations. WCS and existing structures may provide passage for multiple species, depending on their sensitivity to traffic disturbance and ...
  • Public Health Assessment for Transportation Projects
    Public Health Assessment for Transportation Projects
    Christofa, Eleni ;
    Pollitt, Krystal
    2020-02-01 | PDF
    Transportation projects can affect health through multiple pathways, e.g., by degrading air quality or encouraging active transportation. There is a need to incorporate health considerations in transportation decision making to achieve health-related community goals. The objectives of this research project were to assess the state-of-the-practice o ...
  • Speed Limit Change 55 Mph to 60 Mph Safety Evaluation
    Speed Limit Change (55 Mph to 60 Mph) Safety Evaluation
    Saleem, Taha ;
    Srinivasan, Raghavan
    2020-02-01 | PDF
    The objective of this study was to evaluate the safety impacts of increasing the speed limit from 55 mph to 60 mph on two-lane, two-way state highway road segments in Minnesota. An empirical Bayes (EB) before-after analysis was used to estimate crash modification factors (CMFs) for both segments and intersections. The segment analysis showed a 7 pe ...
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