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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 6561 - 6580 of 36104 results
  • Seismic Behavior of Steel Bridges with FatigueProne Details Research Brief
    Seismic Behavior of Steel Bridges with Fatigue-Prone Details [Research Brief]
    Mahmoud, Hussam ;
    Irfaee, Mazin
    2018-09-01 | PDF
    Steel bridges are vulnerable to earthquake ground motions. On question that is unanswered is, what role does fatigue cracking play in the seismic performance of bridges? This is an important question because many steel bridges, particularly those built before 1970, have shown signs of excessive deterioration and fatigue cracking.
  • Successes in Stewardship Context Sensitive Solutions and Design A Practical Approach to Transportation Decisionmaking
    Successes in Stewardship - Context Sensitive Solutions and Design: A Practical Approach to Transportation Decisionmaking
    United States. Federal Highway Administration
    2018-09-01 | PDF
    Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
  • Impacts of the I77 Variable Speed Limit System on Speed and Crash Characteristics During Low Visibility Conditions
    Impacts of the I-77 Variable Speed Limit System on Speed and Crash Characteristics During Low Visibility Conditions
    Gonzales, Daniela ;
    Fontaine, Michael D.
    2018-09-01 | PDF
    Low visibility conditions can inhibit a driver’s ability to perceive appropriate operating speeds, particularly during foggy conditions in which the characteristics of the fog can vary spatiotemporally. By reducing visibility and contrast in the visual field, fog obscures crucial driving cues essential for perceiving depth and speed. Studies have s ...
  • Performance and Analysis of Concrete Bridge Railing using Conventional and Composite Reinforcement Materials Tech Brief
    Performance and Analysis of Concrete Bridge Railing using Conventional and Composite Reinforcement Materials: Tech Brief
    Alaywan, Walid R.
    2018-09-01 | PDF
    The principal objective of this study was to assess the structural adequacy and strength of a precast concrete bridge railing section used by DOTD for the current national cooperative highway’s (NCHRP Report 350) guidelines and for the recommended changes in the Texas study.
  • Characterization of Aggregate Texture and Correlation With Surface Skid Resistance
    Characterization of Aggregate Texture and Correlation With Surface Skid Resistance
    Kouchaki, Sareh ;
    Roshani, Hossein
    2018-09-01 | PDF
    This report consists of two parts presenting the methodology developed by researchers to find the correlation between the texture and friction. The first part of this research study analyzed the micro-texture of aggregates by means of discrete Fourier transform (DFT) and power spectral density (PSD) function. Micro-texture of aggregates is a critic ...
  • Identification of Fatigue Countermeasures for the Short Line Railroad Industry Phase 1 2
    Identification of Fatigue Countermeasures for the Short Line Railroad Industry Phase 1 & 2
    Sherry, Patrick
    2018-09-01 | PDF
    The purpose of the initial project was to establish a baseline for the evaluation of proposed fatigue mitigation efforts, to demonstrate the utilization of measures of sleep and fatigue, and to gather initial data for comparison to other previous studies. Results demonstrated that there was enough data to establish a baseline and to evaluate existi ...
  • A Study on 3D Printing and its Effects on the Future of Transportation
    A Study on 3D Printing and its Effects on the Future of Transportation
    Jumaah, Omar
    2018-09-01 | PDF
    In recent years, significant progress has been made in additive manufacturing (AM) for numerous applications in various industrial segments. International Data Corporation (IDC) forecasts the global market for 3D printing technology to exceed $14 billion in 2019. It is expected to double in the next five years. 3D printing technology can fabricate ...
  • Further Validation of ASR Testing and Approach for Formulating ASRResistant Concrete Mix Technical Report
    Further Validation of ASR Testing and Approach for Formulating ASR-Resistant Concrete Mix: Technical Report
    Mukhopadhyay, Anol ;
    Liu, Kai-Wei
    2018-09-01 | PDF
    The main objective of this study was to further validate the developed rapid aggregate and concrete test methods and a combined innovative approach for formulating performance-based alkali-silica reaction (ASR)–resistant concrete mixes. An innovative step-by-step approach has been developed to formulate ASR-resistant concrete mixes based on four re ...
  • Policies That Impact the Acceleration of Electric Vehicle Adoption
    Policies That Impact the Acceleration of Electric Vehicle Adoption
    Kettles, Colleen
    2018-09-01 | PDF
    To better understand the influence of policy initiatives that relate to electric vehicles (EVs) have on accelerated deployment, this project focused on a number of successful public and private initiatives and policies designed to encourage the adoption of EVs and related infrastructure. References to databases that keep pace with this rapidly evol ...
  • Implementation of New Specification Requirements for Coarse Backfill Materials for Mechanically Stabilized Earth MSE Walls
    Implementation of New Specification Requirements for Coarse Backfill Materials for Mechanically Stabilized Earth (MSE) Walls
    Arciniega, Jose Luis ;
    Cabrera, Diana
    2018-09-01 | PDF
    The service life of mechanically stabilized earth (MSE) walls depends on the rate of corrosion of the metallic reinforcements used in their construction. Assessment of corrosion potential requires the accurate evaluation of pH, resistivity, and ionic (e.g., sulfate and chloride) concentrations of aqueous solutions in contact with the surrounding ag ...
  • Quantifying and Evaluating Community Resilience for Sustainable Cities
    Quantifying and Evaluating Community Resilience for Sustainable Cities
    Wolshon, Brian ;
    Parr, Scott A.
    2018-08-31 | PDF
    The United States Marine Transportation System (MTS) makes large contributions to the nation’s economy, security, safety, and quality of life. Strategic investment, planning, administrative and operational decisions by government at all levels are necessary to maintain the marine transportation system performance at all times, which in turn require ...
  • 06834 Optimization of the Design of Flexible Pavements with Unbound Bases Reinforced with Geogrids using APT Summary
    0-6834: Optimization of the Design of Flexible Pavements with Unbound Bases Reinforced with Geogrids using APT [Summary]
    Zornberg, Jorge G. ;
    Sankaranarayanan, Subramanian
    2018-08-31 | PDF
    The design of flexible pavements with geosynthetic-stabilized unbound base layers is evaluated using accelerated pavement testing. The evaluation also assesses use of KSGI as a parameter governing the performance of the pavement system. The major components of this project include: (i) Field monitoring of geosynthetic-stabilized and control pavemen ...
  • Evaluation of Bicycle and Pedestrian Monitoring Equipment to Establish Collection Database and Methodologies for Estimating Nonmotorized Transportation Project Summary
    Evaluation of Bicycle and Pedestrian Monitoring Equipment to Establish Collection Database and Methodologies for Estimating Non-motorized Transportation [Project Summary]
    Turner, Shawn ;
    Benz, Robert
    2018-08-31 | PDF
    The Texas Department of Transportation (TxDOT) currently has very limited count data on pedestrian and bicyclist usage of the transportation system. This lack of pedestrian and bicyclist count data affects transportation decision-making, including planning, design, and safe traffic operations. The first objective of this research project was to rec ...
  • Direct Determination of Cement Composition Using Xray Diffraction Project Summary
    Direct Determination of Cement Composition Using X-ray Diffraction [Project Summary]
    Mukhopadhyay, Anol ;
    Ganesh, Ramnath Mylapore
    2018-08-31 | PDF
    This project established protocols and specifications for the direct determination of cement composition by Quantitative X-ray Diffraction (QXRD). The main objectives of this research were: 1) developing protocols for routinely performing QXRD testing, 2) testing the effectiveness of the protocols using commercial cement samples, and 3) documenting ...
  • Paths to ADACompliance the Performance and Cost Efficiency of Measurement Technologies that Support ADAMandated SelfEvaluations of Pedestrian Rights of Way
    Paths to ADA-Compliance: the Performance and Cost Efficiency of Measurement Technologies that Support ADA-Mandated, Self-Evaluations of Pedestrian Rights of Way
    Oh, Jun-Seok ;
    Zhang, Jiansong
    2018-08-31 | PDF
    This study used terrestrial laser scanner and open source processing algorithms to develop an approach to automate the evaluation of transportation infrastructure in public rights of way. The authors estimated compliance or noncompliance of specific roadway features with the design standards adopted by the US Access Board and required under the Ame ...
  • Optimum Traffic Signal Settings to Improve Safety and Efficiency when Using Modern Detection Devices Project Summary
    Optimum Traffic Signal Settings to Improve Safety and Efficiency when Using Modern Detection Devices [Project Summary]
    Bibeka, Apoorba ;
    Chaudhary, Nadeem A
    2018-08-31 | PDF
    Traffic signal settings have historically been developed using inductive loops as the predominant detection device. Detection technology has changed significantly over the years. The advent of video detection has provided flexibility to Texas Department of Transportation’s (TxDOT’s) engineers in detector design. In the past few years, additional de ...
  • Strengthening of Existing InvertedT Bent Cap Project Summary
    Strengthening of Existing Inverted-T Bent Cap [Project Summary]
    Hurlebaus, Stefan ;
    Mander, John B.
    2018-08-31 | PDF
    Inverted-T bent caps are used extensively throughout Texas to economically satisfy geometric constraints and to provide an aesthetically pleasing appearance. With a change in design philosophy, many of the early inverted-T bent caps are deficient when evaluated against the current design approach and future increased traffic demands. When replaceme ...
  • The Effects of High Visibility Enforcement on Driver Compliance to Pedestrian Stop RightofWay Laws in Ann Arbor MI
    The Effects of High Visibility Enforcement on Driver Compliance to Pedestrian Stop Right-of-Way Laws in Ann Arbor, MI
    Van Houten, Ron ;
    Oh, Jun
    2018-08-31 | PDF
    The purpose of this study was to replicate the findings of Van Houten et. al. (2013) demonstrating that a multifaceted program could increase the percentage of motorist’s yielding to pedestrians in crosswalks on a community basis in Gainesville, FL, and that these changes actually improved further over a four year follow-up period (Van Houten et. a ...
  • Allowable Limit Contraction and Abutment Scour at Bridges Project Summary
    Allowable Limit Contraction and Abutment Scour at Bridges [Project Summary]
    Briaud, Jean-Louis ;
    Chedid, Mabel
    2018-08-31 | PDF
    Existing guidelines for maximum allowable scour are applicable only to piers since they are based on the stability criteria of the bridge foundations. An additional criterion must be considered when limiting scour at abutments where scour may also affect the stability of the approach embankment. Scour at spill-through abutments can cause slope stab ...
  • Synthesis of LoadDeflection Characteristics of Laterally Loaded Large Diameter Drilled Shafts Project Summary
    Synthesis of Load-Deflection Characteristics of Laterally Loaded Large Diameter Drilled Shafts [Project Summary]
    Wang, Mark (Yen-Chih) ;
    Briaud, Jean-Louis
    2018-08-31 | PDF
    The project deals with evaluating how well current P-y curves predict the behavior of large diameter piles subjected to monotonic lateral loading. The motivation is that current P-y curves were developed starting about 60 years ago based on lateral load tests on piles that were about 2 ft in diameter while today’s pile diameters can reach 12 ft. Th ...
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