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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 5821 - 5840 of 36053 results
  • Older Driver Support System Field Operational Test
    Older Driver Support System Field Operational Test
    Libby, David ;
    Morris, Nichole L.
    2019-05-01 | PDF
    Older drivers represent the highest injury and fatality rate per 100 million miles driven. The disproportionate fatality risk is linked to several known factors, ranging from failure to yield to cognitive and visual limitations to seatbelt use abstention to fragility. Through a series of focus groups, usability tests, and a controlled field test, a ...
  • LifeCycle Cost Analysis for Short and MediumSpan Bridges
    Life-Cycle Cost Analysis for Short- and Medium-Span Bridges
    Maldonado, Stefan L Leiva ;
    Bowman, Mark D.
    2019-05-01 | PDF
    Life-cycle cost analysis (LCCA) has been defined as a method to assess the total cost of a project. It is a simple tool to use when asingle project has different alternatives that fulfill the original requirements. Different alternatives could differ in initialinvestment, operational and maintenance costs among other long term costs. The cost invol ...
  • Improving the Identification and Characterization of Arterial Congestion Bottlenecks
    Improving the Identification and Characterization of Arterial Congestion Bottlenecks
    Zhao, Mo ;
    Venkatanarayana, Ramkumar
    2019-05-01 | PDF
    Performance-based and data-driven approaches are increasingly employed by transportation professionals to provide a strong foundation for making sound decisions and for optimizing investments. This study developed and evaluated one such method for identifying and ranking traffic bottlenecks. Bottleneck analysis tools currently available to the Virg ...
  • Domestic Airline Fares Consumer Report Fourth Quarter 2018 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: Fourth Quarter 2018 Passenger and Fare Information
    United States. Department of Transportation
    2019-05-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Shared Mobility Network for New York State
    Shared Mobility Network for New York State
    Galligano, Michael ;
    Heckl, Rachel A.
    2019-05-01 | PDF
    Over the course of the project, shared mobility programs have expanded to all corners of the State, thanks in part to the technical assistance provided by the contractor and project subcontractors at the Shared Use Mobility Center and Mobility Development Partners. These programs have been developed through a combination of public and private inves ...
  • Development of a Robust Framework for Assessing Bridge Performance using a Multiple Model Approach
    Development of a Robust Framework for Assessing Bridge Performance using a Multiple Model Approach
    Weidner, Jeffrey ;
    Collins, Jin
    2019-05-01 | PDF
    This project presents a simple approach to multiple model deterioration modeling for bridges by identifying common points between deterioration model approaches and combining the results at these points. Inclusion of other data sources into this framework was explored, and an ontology of these sources and their relationships was developed. The resu ...
  • Fauquier County Road Orders 17591783
    Fauquier County Road Orders 1759-1783
    Brush Miller, Ann
    2019-05-01 | PDF
    The road history projects undertaken by the Virginia Transportation Research Council establish the feasibility of studies of early road networks and their use in the environmental review process. These projects, by gathering and publishing the early road orders of the vast parent counties and other significant areas, also lay the foundation for add ...
  • Survey and Economic Analysis of Pavement Impacts from Studded Tire Use in Alaska
    Survey and Economic Analysis of Pavement Impacts from Studded Tire Use in Alaska
    Abaza, Osama ;
    Arafat, Mohammad
    2019-05-01 | PDF
    In cold regions, such as Alaska, using studded tires is common among the public when driving in icy and snowy conditions. However, studded tires cause extensive wear to asphalt pavement, reducing pavement life. Almost 22 years have passed since the Alaska Legislature completed an analysis of the impact on Alaska’s roadways from studded tire use. Th ...
  • US Highway 89 KanabPaunsaugunt Wildlife Crossing and Existing Structures Research
    U.S. Highway 89 Kanab-Paunsaugunt Wildlife Crossing and Existing Structures Research
    Cramer, Patricia ;
    Hamlin, Robert
    2019-05-01 | PDF
    The U.S. Highway 89 Kanab-Paunsaugunt Project was constructed in 2012-2013 to help reduce mule deer-vehicle collisions and provide connectivity for the Paunsaugunt Mule Deer herds and other wildlife in their north-south movements across the highway. Utah Department of Transportation (UDOT) and partners placed 12.5 miles (20.1 km) of fence to guide ...
  • Submerged Road Characteristics and Distresses on LA 493 Natchitoches Parish State Project Number H011071
    Submerged Road Characteristics and Distresses on LA 493, Natchitoches Parish, State Project Number H.011071
    Gaspard, Kevin ;
    Zhang, Zhongjie
    2019-05-01 | PDF
    The Louisiana Transportation Research Center (LTRC) is conducting a research project to determine the pavement and embankment distress mechanisms associated with normal seasonal variation changes in the subgrade soil and base course moisture content in areas with and without trees. Approximately two months after the newly constructed asphaltic conc ...
  • Chloride Diffusivity and Resistivity of Cured and Mature BinaryTernary Concrete Summary
    Chloride Diffusivity and Resistivity of Cured and Mature Binary/Ternary Concrete [Summary]
    Presuel-Moreno, Francisco J
    2019-05-01 | PDF
    Concrete structures in marine environments are constantly exposed to salt. Over years, the chloride ions in salt can migrate through concrete and cause the steel that reinforces the concrete to corrode, causing cracks that let in more chloride ions, further weakening the structure. Understanding how fast chloride ions migrate through concrete is im ...
  • Strength Envelopes for Florida Rock and Intermediate Geomaterials
    Strength Envelopes for Florida Rock and Intermediate Geomaterials
    McVay, Michael C. ;
    Song, Xiaoyu
    2019-05-01 | PDF
    For the design of a shallow foundation on Florida limestone, a calibrated bearing capacity equation based on a material-specific strength envelope is required. In this study, two large data sets containing samples from across the state of Florida were studied. Data set #1 contained over 8,000 results of unconfined compression tests (qu), split tens ...
  • Truck Taxonomy and Classification using Video and WeighInMotion WIM Technology
    Truck Taxonomy and Classification using Video and Weigh-In-Motion (WIM) Technology
    He, Pan ;
    Wu, Aotian
    2019-05-01 | PDF
    The primary objective of the present work was to develop video processing and machine learning methods to automatically detect and classify trucks traveling on Florida highways. The assembly of an automated system to detect, classify, and recognize various truck types from video and to derive their attributes is presented in this report. These extr ...
  • Concrete Pumping Effects on AirEntrained Voids in Concrete Mixtures
    Concrete Pumping Effects on Air-Entrained Voids in Concrete Mixtures
    Becker, Justin ;
    Ley, Tyler
    2019-05-01 | PDF
    Placing concrete using a concrete pump has placement advantages due to the increased speed, accessibility, and convenience of operation. Unfortunately, the pumping of air-entrained concrete is known to affect the fresh air content in the fresh concrete. This has caused concern about the durability of concrete in environments where the concrete will ...
  • Tangential Heave Stress Acting on Deep Foundations in Cold Regions
    Tangential Heave Stress Acting on Deep Foundations in Cold Regions
    Seo, Hoyoung ;
    Li, Liang
    2019-05-01 | PDF
    In this study, the research team performed an experimental investigation of the effect of frost heave during soil freezing on the development of tangential heave force acting on deep foundations. A novel, laboratory-scale tangential heave testing system, instrumented with a model pile, moisture sensors and thermocouples, was developed in this study ...
  • Safety Performance of Rechargeable Energy Storage Systems
    Safety Performance of Rechargeable Energy Storage Systems
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2019-05-01 | PDF
    The purpose of this project is to develop objective test procedures for meaningful, comparable, and quantitative evaluations of Li-ion based Rechargeable Energy Storage Systems (RESSs) in hybrid electric vehicle (HEV), plug-in hybrid electric vehicle (PHEV) and electric vehicle (EV) platforms. The test procedures are applicable to all components of ...
  • Effects of Temperature Segregation on the Volumetric and Mechanistic Properties of Asphalt Mixtures Tech Summary
    Effects of Temperature Segregation on the Volumetric and Mechanistic Properties of Asphalt Mixtures [Tech Summary]
    Mohammad, Louay N. ;
    Cooper III, Samuel
    2019-05-01 | PDF
    Segregation in asphalt mixtures can be described as a concentration of coarse materials in some areas and fine materials in others, which results in non-uniform mixes that do not duplicate the original design, grading, or asphalt cement. Temperature segregation (TS) is a recently found phenomenon of non-uniform distribution of temperatures across t ...
  • Allowable Limit Contraction and Abutment Scour at Bridges Technical Report
    Allowable Limit Contraction and Abutment Scour at Bridges: Technical Report
    Briaud, Jean-Louis ;
    Chedid, Mabel
    2019-05-01 | PDF
    Scour at bridges is the leading cause of bridge failures. While research efforts mostly focus on the prediction of the scour depth at bridge supports, little to no attention is given to the determination of maximum allowable scour depth at bridges. Providing scour countermeasures at all existing bridges to ensure acceptable scour resistance is econ ...
  • Assessment of the Trimble MX7 for Use in Creation of Alignment Files for the Intelligent Compaction and Paver Mounted Thermal Profile Methods
    Assessment of the Trimble MX7 for Use in Creation of Alignment Files for the Intelligent Compaction and Paver Mounted Thermal Profile Methods
    Embacher, Rebecca ;
    Schneider, James
    2019-05-01 | PDF
    The objective of the work was to validate the Trimble MX7 system for use in collecting infrastructure information for creation of in-place alignment files for use with intelligent compaction and paver mounted thermal profiling technologies and also to provide the capability to collect other asset information along the roadway. One project per distr ...
  • Reevaluation of LRFD Resistance Factors for Driven Piles Summary
    Re-evaluation of LRFD Resistance Factors for Driven Piles [Summary]
    Gunaratne, Manjriker ;
    Mullins, Gray
    2019-05-01 | PDF
    Structural foundations are tested during installation to verify that their factored bearing resistance exceeds the factored design load. Load and Resistance Factor Design (LRFD) is the current method for structural analysis, which includes factors to account for the uncertainty of the design loads on, and the expected resistance of, structural foun ...
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