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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 4781 - 4800 of 36908 results
  • Connected Autonomous Vehicles Safety During Merging and Lane Change and Impact on Traffic Flow
    Connected Autonomous Vehicles: Safety During Merging and Lane Change and Impact on Traffic Flow
    Iannou, Petros ;
    Monteiro, Fernando V
    2020-09-01 | PDF
    In this report we address the problem of cooperative lane change maneuvers where vehicles communicate with each other and negotiate the creation of safe spacings in order to merge without taking any safety risks. The proposed approach requires that the merging vehicle negotiates the creation of a safety gap in the destination lane and till the lane ...
  • Characterization of Runoff Quality From Paved LowVolume Roads and Optimization of Treatment Methods
    Characterization of Runoff Quality From Paved Low-Volume Roads and Optimization of Treatment Methods
    Natarajan, Poornima ;
    Weiss, Peter T.
    2020-09-01 | PDF
    Vehicular traffic contributes a large fraction of the pollutant load in stormwater runoff from roadways. While runoff concentrations have historically been characterized for urban roads with high average daily traffic (ADT), the runoff quality from paved rural roads that have relatively low ADT is largely unknown. In this study, runoff from low-vol ...
  • Planning Corridors for Transit Signal Priority While Considering Pedestrian Delay
    Planning Corridors for Transit Signal Priority While Considering Pedestrian Delay
    Heaslip, Kevin P ;
    Kim, Doyeon
    2020-09-01 | PDF
    This research study consisted of developing a decision-support tool for Transit Signal Priority (TSP) implementation for Virginia corridors. TSP is a measure to temporarily modify signal timings to prioritize transit vehicle movement and improve performance at signalized intersections. The study included an in-depth literature review, criteria iden ...
  • Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons Utah Phase II Study
    Assessing Corrosion of Extracted MSE Wall Reinforcement Coupons, Utah Phase II Study
    Fonseca, Fernando S. ;
    Thompson, Robert A
    2020-09-01 | PDF
    The purpose of this study was to extract galvanized steel wire reinforcement coupons from mechanically stabilized earth (MSE) walls along I-15 in Salt Lake Valley and determine the rate of corrosion that has taken place since Phase I, which was conducted by Gerber and Billings (2010). The galvanized steel reinforcement analyzed in this study has be ...
  • Geostatistical Deep Foundation Design Software
    Geo-statistical Deep Foundation Design Software
    Davidson, Michael T. ;
    McVay, Michael C.
    2020-09-01 | PDF
    Significant portions of overall design and construction costs for Florida bridges are typically attributed to deep foundation components. Such costs arise because soils are highly variable materials; measured soil properties typically exhibit spatial variability across a given site, both with respect to depth and horizontal position. In addition, e ...
  • New Carbon Fiber Anchor To Secure Carbon FiberReinforced Polymer CFRP Flexural Strengthening Sheets
    New Carbon Fiber Anchor To Secure Carbon Fiber-Reinforced Polymer (CFRP) Flexural Strengthening Sheets
    Rasheed, Hayder A. ;
    Foerster, Andrew S
    2020-09-01 | PDF
    Externally bonded fiber-reinforced polymer (FRP) is commonly used to strengthen concrete structures, but research is needed to ensure that optimal design practices are implemented. This study utilized externally bonded carbon FRP (CFRP) to strengthen bridge-scale reinforced concrete T-beams. In addition to flexural CFRP, new CFRP splay anchors were ...
  • Construction of LowCracking HighPerformance Bridge Decks Incorporating New Technology
    Construction of Low-Cracking High-Performance Bridge Decks Incorporating New Technology
    Lafikes, James ;
    Darwin, David
    2020-09-01 | PDF
    Construction and early-age crack evaluations of four bridge decks in Minnesota placed from 2016 to 2018 that incorporate specifications for Internally-Cured Low-Cracking High-Performance Concrete (IC-LC-HPC) are documented in this study. Two additional decks followed specifications for high-performance concrete and served as controls paired with IC ...
  • Activity Sequencing Logics Using Daily Work Report Data
    Activity Sequencing Logics Using Daily Work Report Data
    Jeong, H. David ;
    Alikhani, Hamed
    2020-09-01 | PDF
    Accurate and reliable project duration estimation is highly dependent upon two major components; a) reasonable production rate estimation of major work items, and b) logical sequencing of those work items. The phase I of the study developed an MS Excel-based production rate estimation tool (PRET). The phase II (this project) has developed construct ...
    Supporting Files
  • Effectiveness of Green Strobes on Winter Maintenance Vehicles and Equipment
    Effectiveness of Green Strobes on Winter Maintenance Vehicles and Equipment
    Zockaie, Ali ;
    Saedi, Ramin
    2020-08-31 | PDF
    Snow removal and deicing activities are performed by roadway agencies to enhance winter mobility and safety. Due to slower travel speeds during these operations, low visibility and reduced pavement friction, safety and collision avoidance remain persistent concerns. To improve the visibility of winter maintenance vehicles, the Michigan Department o ...
  • 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 | PDF
    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 | PDF
    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 ...
  • Implementation of Pedestrian and Bicyclist Count Database and Monitoring Process Project Summary
    Implementation of Pedestrian and Bicyclist Count Database and Monitoring Process [Project Summary]
    Turner, Shawn ;
    Lasley, Phil
    2020-08-31 | PDF
    This implementation project focused on three components of implementation: 1. Short overview webinars to convey basic concepts and generate interest for in-depth training. 2. In-depth training workshops to address technical details related to three main topic areas: Data collection and equipment; Data summary and analysis; and Using data for decisi ...
  • 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 ...
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