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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 4441 - 4460 of 36019 results
  • Development Education and Implementation of a LowCost Audio Sensorbased Autonomous Surveillance System for Smart and Connected Transportation Infrastructure Construction and Maintenance
    Development, Education, and Implementation of a Low-Cost Audio Sensor-based Autonomous Surveillance System for Smart and Connected Transportation Infrastructure Construction and Maintenance
    Lee, Yong-Cheol ;
    Choi, Jin-Woo
    2020-08-01 | PDF
    Each Department of Transportation (DOT) in the United States has to govern and oversee an enormous number of transportation construction and maintenance projects. However, since a transportation construction project entails several miles of a job site including numerous work tasks and equipment operations, it has been increasingly challenging for e ...
  • Comparison of SHRP 2 Naturalistic Driving Data to Geometric Design Speed Characteristics on Freeway Ramps
    Comparison of SHRP 2 Naturalistic Driving Data to Geometric Design Speed Characteristics on Freeway Ramps
    Brewer, Marcus A. ;
    Stibbe, Jayson
    2020-08-01 | PDF
    Shared autonomous vehicle (SAV) systems, in which autonomous vehicles (AVs) are owned by transportation network companies that offer Mobility as a Service (MaaS) to customers, are gaining considerable research attention. SAVs have the potential to reduce vehicle ownership and parking requirements, improve traffic conditions, and minimize empty-vehi ...
  • Assessing the Safety Implication of Alternative Speed Limits in California
    Assessing the Safety Implication of Alternative Speed Limits in California
    Musabbir, Sarder Rafee ;
    Zhang, Michael
    2020-08-01 | PDF
    This project combined the statewide crash data (SWIRTS) and traffic data (PeMS) to develop statistical models to determine the safety impacts of alternative speed limits on California highways. The models examined whether various factors about crashes, including average traffic speed and truck-involvement, correlated with outcomes such as crash sev ...
  • Design of Resilient Smart Highway Systems with DataDriven Monitoring from Networked Cameras
    Design of Resilient Smart Highway Systems with Data-Driven Monitoring from Networked Cameras
    Jin, Li ;
    Feng, Chen
    2020-08-01 | PDF
    This project aims to develop a systematic way to design smart highway systems with networked video monitoring and control resiliency against environment disruptions and sensor failures. On the video monitoring side, the authors investigate (1) efficient deep learning methods for extracting fine-grained local categorical traffic information from ind ...
  • Deep Reinforcement Learning Algorithm for Dynamic Pricing of Express Lanes With Multiple Access Locations
    Deep Reinforcement Learning Algorithm for Dynamic Pricing of Express Lanes With Multiple Access Locations
    Pandey, Venktesh ;
    Wang, Evana
    2020-08-01 | PDF
    This article develops a deep reinforcement learning (Deep-RL) framework for dynamic pricing on managed lanes with multiple access locations and heterogeneity in travelers’ value of time, origin, and destination. This framework relaxes assumptions in the literature by considering multiple origins and destinations, multiple access locations to the ma ...
  • AllWeather Sub50cm RadarInertial Positioning
    All-Weather Sub-50-cm Radar-Inertial Positioning
    Narula, Lakshay ;
    Iannucci, Peter A.
    2020-08-01 | PDF
    Deployment of automated ground vehicles beyond the confines of sunny and dry climes will require sub-lane level positioning techniques based on radio waves rather than near-visible-light radiation. Like human sight, lidar and cameras perform poorly in low-visibility conditions. This paper develops and demonstrates a novel technique for robust sub-5 ...
  • Experimental and Analytical Evaluation of Residual Capacity of CorrosionDamaged Prestressed Concrete Bridge Girders
    Experimental and Analytical Evaluation of Residual Capacity of Corrosion-Damaged Prestressed Concrete Bridge Girders
    Alfailakawi, Ali ;
    Roberts-Wollmann, C. L.
    2020-08-01 | PDF
    The durability of infrastructure components, such as prestressed concrete bridge beams, can be significantly affected by long-term deterioration associated with corrosion. Corrosion is a major concern for bridges in Virginia, due to the frequent use of deicing salts during the winter, as well as the number of structures in marine environments. The ...
  • The Use of Resistivity Testing for Quality Control of Concrete Mixtures
    The Use of Resistivity Testing for Quality Control of Concrete Mixtures
    Hartell, Julie Ann
    2020-08-01 | PDF
    This study proposes a new quality control and compliance method for concrete mixture design using standard surface resistivity testing. This method helps in determining key mixture parameters such as fly ash content and w/cm of placed concrete. Based on the gain in resistivity over time, it was found that the slope of the surface resistivity versus ...
  • Assessment of Composite Pavement in Virginia A Trial Section on US 60
    Assessment of Composite Pavement in Virginia: A Trial Section on US 60
    Hossain, M. Shabbir ;
    Nair, Harikrishnan
    2020-08-01 | PDF
    The Strategic Highway Research Program 2 (SHRP2) identified composite pavement as a “renewal solution” to support for implementation, and the Virginia Department of Transportation (VDOT) received funding to demonstrate its potential. In 2017, this funding was applied to support major rehabilitation of two westbound lanes of US 60 in Henrico County, ...
  • Segment and Intersection Crash Analysis Methodologies for Utah Highways
    Segment and Intersection Crash Analysis Methodologies for Utah Highways
    Schultz, Grant G. ;
    Lunt, Camille C
    2020-08-01 | PDF
    This research focuses on the Crash Analysis Methodology for Segments (CAMS) which provides a way for engineers at the Utah Department of Transportation (UDOT) to prioritize safety improvements on state-owned roadways. Unlike the Utah crash analysis methodologies that come before it, the CAMS focuses exclusively on segment-related crashes. The benef ...
  • 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 ...
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