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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 4361 - 4380 of 36019 results
  • Environmental Justice Implications of Roadway Topography
    Environmental Justice Implications of Roadway Topography
    Gbologah, Franklin ;
    Prendergast, Kyla
    2020-08-31 | PDF
    This study evaluates environmental justice implications of roadway topography. Most MPOs and transportation agencies use a fixed buffer of 200 meters to identify the population that is at-risk of unsafe exposure to mobile emissions near roadways. Current analysis methodologies are unable to account for the impact that road grade has on emission qua ...
  • Food Flora Waste to Fleet Fuel Development and Application of the F4 Framework
    Food & Flora Waste to Fleet Fuel: Development and Application of the F4 Framework
    Sattler, Melanie L. ;
    Hyun, Kate
    2020-08-31 | PDF
    As cities strive for more sustainable transportation systems, many are considering renewable fuels for fleets. Biogas has several advantages as an alternative fuel. Composed primarily of methane, it can be cleaned for use in natural gas vehicles, or burned in a turbine/engine to generate electricity for electric vehicles. Biogas can reduce air poll ...
  • PreStress Losses in Decked BulbTee Girders Phase 1A Sensor Study for PreStress Loss Monitoring System
    Pre-Stress Losses in Decked Bulb-Tee Girders (Phase 1-A: Sensor Study for Pre-Stress Loss Monitoring System)
    Ahn, Il-Sang
    2020-08-31 | PDF
    The research tested the performance of concrete-embedded strain sensors. The strain sensors are to use in a long-term pre-stress loss monitoring system of decked bulb-tee girders. Based on the measured total strain for 120 days, it was evaluated that the total strain can reach 3,000με over 5 years. Three types of vibrating wire strain gauges (VWSGs ...
  • Evaluating Effectiveness of Floodplain Sites Along the Lamoille Valley Rail Trail A Blueprint for Future RailRiver Projects
    Evaluating Effectiveness of Floodplain Sites Along the Lamoille Valley Rail Trail: A Blueprint for Future Rail-River Projects
    Underwood, Kristen L. ;
    Worley, Lindsay
    2020-08-31 | PDF
    Floodplains perform many functions of value to society, including conveyance and storage of floodwaters for reduced downstream impacts, sediment and nutrient deposition to support soil formation, and maintenance of pulsed overbank flows to support diverse habitats. When constructed along Vermont’s river valleys in the mid-to-late 1800s, railroads o ...
    Supporting Files
  • Residential Moves Into and Away from Los Angeles Rail Transit Neighborhoods Adding Insight to the Gentrification and Displacement Debate
    Residential Moves Into and Away from Los Angeles Rail Transit Neighborhoods: Adding Insight to the Gentrification and Displacement Debate
    Boarnet, Marlon ;
    Painter, Gary
    2020-08-31 | PDF
    The authors study moves into and away from rail station neighborhoods in Los Angeles. While the literature has focused on whether rail transit stations are sites of low-income residential displacement, very little research has studied whether places persons move to and from when moving into or out of rail transit station areas are less well-resourc ...
  • Crowdsourcing Parking Data for Micromobility Vehicles [supporting dataset]
    Pathak, Chintan ;
    Arabkhedri, Borna
    2020-08-31 | ZIP
    The archive contains the following: 1. Code for the app - MisplacedWheels 2. Code for viewing the submitted reports: MisparkedRepo 3. The backup of the database, which can be used to set it up.
    Dataset Supporting Files
  • Development of Automated Roadway Lighting Diagnosis Tools for Nighttime Traffic Safety Improvement
    Development of Automated Roadway Lighting Diagnosis Tools for Nighttime Traffic Safety Improvement
    Wang, Zhenyu ;
    Lin, Pei-Sung
    2020-08-31 | PDF
    Roadway lighting is a conventional roadway infrastructure to ensure nighttime safety and security for multimodal road users (motorists, pedestrians, cyclists, and transit passengers). To cost-effectively maintain a roadway lighting system, key tasks in infrastructure management include periodically measuring roadway lighting levels, diagnosing ligh ...
  • Utilizing School Bus Routes to Deliver Meals to Families in Need [supporting datasets]
    Smith, Stephen F. ;
    Lightman, Karen
    2020-08-31 | ZIP
    This report summarizes the results of a 3-month project aimed at coupling artificial intelligence (AI)-based routing and scheduling technology with machine learning to demonstrate an initial solution to the problem of remote delivery of school meals to students in need, and jumpstarting research in this area. With the onset of the COVID-19 pandemic ...
    Dataset Supporting Files
  • Zoning and the Density of Urban Development
    Zoning and the Density of Urban Development
    Parkhomenko, Andrii ;
    Delventhal, Matthew J.
    2020-08-31 | PDF
    The authors build a quantitative general equilibrium model of residence and employment choices under municipal density limits. Developers decide where to build, businesses decide where to offer jobs, and workers decide where to live and work given exogenous location characteristics, transport infrastructure, and zoning restrictions. The authors use ...
  • RealTime Rail Defect Detection with Eddy Current EC Technique Signal Processing and Case Studies of Rail Samples
    Real-Time Rail Defect Detection with Eddy Current (EC) Technique: Signal Processing and Case Studies of Rail Samples
    Wang, Jiaqing ;
    Dai, Qingli
    2020-08-30 | PDF
    Safety is one of the key issues for rail transportation. Nowadays, rails are exposed to constantly increasing traffic with heavy loads and high-speed trains. Increasing the efficiency, frequency, and speed of rail defect detection can reduce maintenance costs and improve operational safety. The non-contact eddy current system can be operated in hig ...
  • Analysis of Vibrations in a Structure due to Passing Trains Using a Coupled Finite Element and Multibody Dynamics Model
    Analysis of Vibrations in a Structure due to Passing Trains Using a Coupled Finite Element and Multibody Dynamics Model
    Foster, Craig
    2020-08-29 | PDF
    Ground-borne vibrations in structures due to passing trains are an ongoing issue in the rail industry. While in extreme cases such vibrations can lead to structural fatigue and failure, occupant comfort is usually the controlling factor. With the advent of higher-speed rail as well as the increasing value of urban real estate near train tracks, acc ...
  • Quantifying Intermodal Facility Capacity Factor Interactions through Simulation
    Quantifying Intermodal Facility Capacity Factor Interactions through Simulation
    Dick, C. Tyler ;
    Chen, Wesley
    2020-08-29 | PDF
    Intermodal hubs play an important role in the operation of railway networks. Intermodal freight is a primary revenue stream for Class I railroads in the United States. Intermodal traffic volume has increased approximately 10 percent since 2011 and reached new all-time record volumes during the summer of 2017. This growth combined with shifts in tra ...
  • Computational Analysis of Railroad Ballast Settlement
    Computational Analysis of Railroad Ballast Settlement
    Foster, Craig
    2020-08-29 | PDF
    In this paper, finite element (FE) structural dynamics algorithms are used along with multibody systems (MBS) techniques to develop detailed railroad track substructure models to analyze the differential settlement in the ballast due to dynamic cyclic loading conditions. A cap plasticity material model is used in order to capture the geotechnical b ...
  • Results of a Survey on Transportation Safety Equity in Hawaii
    Results of a Survey on Transportation Safety Equity in Hawaii
    Prevedouros, Panos D ;
    Nunes, Flavia
    2020-08-28 | PDF
    Five transportation equity questions were developed for this assessment. Question 1 addressed EMS response in urban and rural areas. People with a bachelor’s degree or higher thought slightly more that rural response is worse. Rural residents believed it is worse and half of urban residents agreed. CSET minority respondents thought that rural respo ...
  • Support for Caltrans Statewide Mobile Terrestrial Laser Scanning MTLS System Usage
    Support for Caltrans Statewide Mobile Terrestrial Laser Scanning (MTLS) System Usage
    Yen, Kin S. ;
    Lasky, Ty A.
    2020-08-28 | PDF
    This research supported Caltrans Office of Land Surveys’ (OLS) update of Chapter 15 of the Caltrans Survey Manual and creation of the Caltrans MTLS Guidelines document. In addition, the research contributed to firmware/software updates on both the Trimble MX8 and Riegl VMX1HA MTLS systems, the integration of a Ladybug 5+ 360-degree camera to the MX ...
  • Evaluation of the MGS Placed 6 in Behind a 6in Tall AASHTO Type B Curb To MASH TL3
    Evaluation of the MGS Placed 6 in. Behind a 6-in. Tall AASHTO Type B Curb To MASH TL-3
    Ronspies, Kellon ;
    Rosenbaugh, Scott
    2020-08-27 | PDF
    The use of curbs along roads is often required for certain functions such as drainage control, right-of-way reduction and sidewalk separation. However, curbs along roadways can adversely affect the interaction of errant vehicles with roadside barriers. Curbs placed near guardrail systems increase the propensity for vehicle override, vehicle underri ...
  • Understanding Attention Management and Driver Decision Behavior at ShortStorage Rail Grade Crossings
    Understanding Attention Management and Driver Decision Behavior at Short-Storage Rail Grade Crossings
    Veinott, Elizabeth ;
    Linja, Anne
    2020-08-26 | PDF
    The goal of this project was to focus on understanding driver attention and decision-making behavior at short-storage highway-rail grade crossings (HRGCs) compared to non-short storage HRGCs. While rail safety has improved from the mid-1990s to 2010 (Yeh & Multer, 2008), the decreasing trend has flattened over the last 10 years (Tey, et al., 2013). ...
  • Selecting the Most Feasible Construction Phasing Plans for Urban Highway Rehabilitation Projects
    Selecting the Most Feasible Construction Phasing Plans for Urban Highway Rehabilitation Projects
    Choi, Kunhee ;
    Jeong, H David
    2020-08-25 | PDF
    Despite the abundance of research that has aimed to understand the effects of highway work zones, very little definitive information is available concerning the determination of work zone length (WZL). Quantitative studies that holistically model WZL are very rare. To fill this gap, this study identifies critical factors affecting WZL and develops ...
  • Driver Impairment Detection and Safety Enhancement Through Comprehensive Volatility Analysis
    Driver Impairment Detection and Safety Enhancement Through Comprehensive Volatility Analysis
    Khattak, Asad J. ;
    Arvin, Ramin
    2020-08-21 | PDF
    The ubiquity of sensors and increasing computational resources has enabled monitoring driver, vehicle, and roadway surroundings. A key objective of this research is to extract useful information from multi-dimensional data streams coming in from sensors. The has developed a framework for obtaining, processing, and analyzing high-frequency multi-dim ...
  • CapacityFlow FeatureBased Restoration Strategy Optimization for Resilient Transportation Systems To Enhance Mobility Accessibility and Equity After Disruptive Events
    Capacity-Flow Feature-Based Restoration Strategy Optimization for Resilient Transportation Systems To Enhance Mobility, Accessibility, and Equity After Disruptive Events
    Zhao, Tingting ;
    Zhang, Yu
    2020-08-20 | PDF
    Disruptive events lead to capacity degradation of transportation infrastructure, and a good restoration plan can minimize the aftermath impacts during the recovery period. This is considered one aspect of resiliency for transportation systems. Although unmet demand has been proposed as one measure of resilience for freight transportation, it has ra ...
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