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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 4881 - 4900 of 36908 results
  • Assessment of 5310 Program Utilization and Development of Strategies To Optimize Mobility Services for Seniors and Persons With Disabilities
    Assessment of 5310 Program Utilization and Development of Strategies To Optimize Mobility Services for Seniors and Persons With Disabilities
    Catala, Martin ;
    Joslin, Ann
    2020-08-01 | PDF
    The Federal Section 5310 grant program supports organizations that provide transportation services to seniors and persons living with disabilities. The optimization of the services can improve the lives of the intended recipients of the 5310 grant program by increasing services and improving service quality and efficiency. This report highlights th ...
  • Statistical Inference Without Excess Data Using Only Stochastic Gradients Volume 2
    Statistical Inference Without Excess Data Using Only Stochastic Gradients: Volume 2
    Li, Tianyang ;
    Liu, Liu
    2020-08-01 | PDF
    We present a novel statistical inference framework for convex empirical risk minimization, using approximate stochastic Newton steps. The proposed algorithm is based on the notion of finite differences and allows the approximation of a Hessian-vector product from first-order information. In theory, our method efficiently computes the statistical er ...
  • Evaluation of Corrosion Inhibiting Materials Applied by Impregnation Pressure Injection Methods to Prevent Corrosion of PostTensioned Tendons
    Evaluation of Corrosion Inhibiting Materials Applied by Impregnation (Pressure Injection) Methods to Prevent Corrosion of Post-Tensioned Tendons
    Silnutzer, Justin ;
    Mraied, Hesham
    2020-08-01 | PDF
    Tendon impregnation has been proposed as a potential method to prevent and arrest corrosion in post-tensioned tendons. This technology uses the interstitial spaces between the tendon wires to inject a corrosion-mitigating fluid into the tendon. This project was performed to evaluate the long-term effectiveness and the service life of the material(s ...
  • Evaluation of CementModified Soil CMS With Microcracking
    Evaluation of Cement-Modified Soil (CMS) With Microcracking
    Tannoury, George A ;
    Al-Naddaf, Mahdi
    2020-08-01 | PDF
    Cement modification of subgrade has been widely practiced for the past few decades. Recently, cement has become a more economical binder to modify in-situ subgrade soil since other binders, such as fly ash, have become less available and therefore their prices have increased significantly. In addition, a much higher percentage of fly ash needs be u ...
  • Residual Capacity of Impacted Bridge Piers
    Residual Capacity of Impacted Bridge Piers
    Roy, Suman ;
    Sorensen, Andrew D.
    2020-08-01 | PDF
    The FHWA has recently initiated research to determine the vulnerability of bridge piers subject to vehicular impact. Vehicular impact to bridge piers results in varying levels of damage and corresponding reduction in structural capacity. The extent of the damage determines the level of corrective maintenance required to keep the bridge in service o ...
  • Corrugated Metal Pipe Culvert Invert Repair Using Engineered Cementitious Composite
    Corrugated Metal Pipe Culvert Invert Repair Using Engineered Cementitious Composite
    Ozyildirim, H. Celik ;
    Sharifi, Mary
    2020-08-01 | PDF
    Corrugated metal pipe culverts undergo deterioration mainly in the invert because of corrosion and abrasion. This study investigated invert paving using engineered cementitious composite (ECC) in thicknesses of 1 in or less above the crests of the corrugations in corrugated metal pipe made of galvanized steel. Such a thickness is not expected to ha ...
  • Vision Camera Data Collection Traffic Analysis Enhancements
    Vision Camera Data Collection & Traffic Analysis Enhancements
    Sharma, Kshitij ;
    Wentz, Bradley
    2020-08-01 | PDF
    As part of this study, 15 intersections with approximately 60 cameras were to be configured to collect traffic volumes and speeds. All of these cameras are the newer VISION models. In addition, the objectives of the study include building enhancements to the existing North Dakota State University (NDSU) Traffic Analysis Tool and to obtain cost esti ...
  • Laboratory Testing of Transverse Joints for PrecastPanel BridgeDeck Replacement Systems
    Laboratory Testing of Transverse Joints for Precast-Panel Bridge-Deck Replacement Systems
    Matthews, Jamieson D ;
    Barnes, Robert W.
    2020-08-01 | PDF
    Out of the 614,387 bridges in the United States, 56,007 are structurally deficient. In many instances this structural deficiency relates to the deck of the bridge. Deck degradation is very common in bridges over 25 years old. Many decks fail several years before the rest of the bridge superstructure and substructure reach the end of their useful li ...
  • Noisy Blackbox Optimization Using MultiFidelity Queries A Tree Search Approach
    Noisy Blackbox Optimization Using Multi-Fidelity Queries: A Tree Search Approach
    Sen, Rajat ;
    Kandasamy, Kirthevasan
    2020-08-01 | PDF
    We study the problem of black-box optimization of a noisy function in the presence of low-cost approximations or fidelities, which is motivated by problems like hyper-parameter tuning. In hyper-parameter tuning evaluating the black-box function at a point involves training a learning algorithm on a large dataset at a particular hyper-parameter and ...
  • I Should Have Moved Somewhere Else The Impacts of Gentrification on Transportation and Social Support for Black WorkingPoor Families in Portland Oregon
    “I Should Have Moved Somewhere Else”: The Impacts of Gentrification on Transportation and Social Support for Black Working-Poor Families in Portland, Oregon
    Howland, Steven Anthony
    2020-08-01 | PDF
    Portland has faced a mass displacement of Black households from the historically segregated area of Albina through various phases of urban renewal, urban deterioration, and gentrification. A substantial number of them have moved to East Portland, a suburban segment of the City of Portland that was unincorporated county land prior to the 1990’s. As ...
  • Characterization of Reclaimed Asphalt Pavement RAP for HMA Surface Courses in Massachusetts
    Characterization of Reclaimed Asphalt Pavement (RAP) for HMA Surface Courses in Massachusetts
    Mogawer, Walaa S. ;
    Austerman, Alexander J.
    2020-08-01 | PDF
    The goal of this study was to understand the properties of the reclaimed asphalt pavement (RAP) sources available in Massachusetts and develop guidelines or recommendations for using RAP in new hot-mix asphalt surface course mixtures. MassDOT specifications allow up to 15% RAP by dry weight in surface mixtures without using a softer-grade virgin bi ...
  • Network Level Pavement Structural Testing With the Traffic Speed Deflectometer
    Network Level Pavement Structural Testing With the Traffic Speed Deflectometer
    Katicha, Samer W. ;
    Shrestha, Shivesh
    2020-08-01 | PDF
    This report describes research conducted to incorporate pavement structural condition information obtained from the Traffic Speed Deflectometer (TSD) into the Virginia Department of Transportation (VDOT) pavement management system decision making process for bituminous pavement sections. Testing was conducted on a 4,000-mile (1,500 interstate miles ...
  • Phase III Transportation Investment Act Benchmark Assessment and BenefitCost Analysis 20132018
    Phase III: Transportation Investment Act — Benchmark Assessment and Benefit–Cost Analysis, 2013–2018
    Ross, Catherine L. ;
    Boston, Thomas D.
    2020-08-01 | PDF
    The Transportation Investment Act (TIA) is a voter initiative in Georgia that adds 1 percent to local sales taxes over 10 years. Of additional revenue, 75 percent is devoted to approved transportation investment projects, and 25 percent is returned to local jurisdictions to spend on any transportation projects they choose. The taxing authority last ...
  • Examination of Features Correlated With Roadway Departure Crashes on Rural Roads
    Examination of Features Correlated With Roadway Departure Crashes on Rural Roads
    Appiah, Justice ;
    Zhao, Mo
    2020-08-01 | PDF
    Roadway departure (RD) crashes are one of the major causes of fatalities on highways. Reducing the number and severity of RD crashes is one of the emphasis areas of the strategic highway safety plan for many state departments of transportation in the United States. Many significant efforts have been aimed at reducing RD crashes, and a continued foc ...
  • Innovative and Integrative Best Management Practices BMPs for Surface and Groundwater Protection
    Innovative and Integrative Best Management Practices (BMPs) for Surface and Groundwater Protection
    Kibler, Kelly M ;
    Chang, Ni-Bin
    2020-08-01 | PDF
    In this project, development of innovative methods for the integrated evaluation of surface and groundwaters inform practical applications for stormwater best management practices (BMPs) aimed at remediating stormwater nutrient impacts. To explore innovative uses of engineered media, five novel chemically activated media (CAM) were developed and te ...
  • Evaluation Beneficiation and Implementation of Alternative Concrete Pozzolans for Transportation Infrastructure
    Evaluation, Beneficiation, and Implementation of Alternative Concrete Pozzolans for Transportation Infrastructure
    Rajabipour, Farshad ;
    Jafari, Khashayar
    2020-07-31 | PDF
    The supply of conventional supplementary cementitious materials (SCMs such as coal fly ash and ground granulated blast furnace slag) continues to fall further behind the concrete industry’s demand to produce durable and sustainable concretes. As an alternative, interest in nontraditional pozzolanic materials continues to grow. This study evaluated ...
  • CTDOT Pavement Design Handbook
    CTDOT Pavement Design Handbook
    Zinke, Scott ;
    Larsen, Donald
    2020-07-28 | PDF
    This document presents the process and methodology for pavement designs in conformance with CT DOT design practices including new construction, rehabilitation, and preservation. Types of pavements addressed include flexible [asphalt concrete] pavements, rigid [Portland cement concrete] pavements, and composite pavements. This document addresses des ...
  • Connected Vehicle Pilot Deployment Concept Phase 1 System Requirements Specification SyRS WYDOT
    Connected Vehicle Pilot Deployment Concept Phase 1, System Requirements Specification (SyRS) – WYDOT
    Gopalakrishna, Deepak ;
    Garcia, Vince
    2020-07-27 | PDF
    The Wyoming Department of Transportation’s (WYDOT) Connected Vehicle (CV) Pilot Deployment Program is intended to develop a suite of applications that utilize vehicle to infrastructure (V2I) and vehicle to vehicle (V2V) communication technology to reduce the impact of adverse weather on truck travel in the I-80 corridor. These applications support ...
  • Operational Applications of Signalized Offset TIntersections
    Operational Applications of Signalized Offset T-Intersections
    Cunningham, Christopher M. ;
    Warchol, Shannon
    2020-07-22 | PDF
    NCDOT maintains a significant number of T intersections with developable land occupying the vacant fourth leg. When a need for a fourth leg is established, NCDOT must determine the optimal location of the leg. Common options include adding the leg to the existing intersection as well as moving the leg up or downstream of the existing intersection t ...
  • Resilient and Dynamic Modulus Testing For ME Pavement Design
    Resilient and Dynamic Modulus Testing For M-E Pavement Design
    Lingwall, Bret
    2020-07-21 | PDF
    This project was originally funded with Principle Investigator (PI) Dr. Soonkie Nam, with Dr. Bret Lingwall as co-PI serving in a support role. The project began in late 2015, and the project was turned over to Dr. Lingwall as PI when Dr. Nam left SDSMT in August of 2017. Due to insurmountable equipment malfunctions, none of the dynamic modulus or ...
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