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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 4581 - 4600 of 36908 results
  • Advanced Modeling and Design Methodology for Pavements Using PlasticityBased Shakedown Theory
    Advanced Modeling and Design Methodology for Pavements Using Plasticity-Based Shakedown Theory
    Chen, Shengli ;
    Sun, Chao
    2020-11-01 | PDF
    Pavement design is a process intended to find the most economical combination of layer thickness and material type for the pavement, taking into account the properties of the subgrade soil and the traffic to be carried during the service life of the road. The currently prevalent methods of pavement analysis and design, however, are more or less emp ...
  • Seismic Performance Design Criteria for Bridge Bent Plastic Hinge Regions
    Seismic Performance Design Criteria for Bridge Bent Plastic Hinge Regions
    Murtuz, A K M Golam ;
    Dusicka, Peter
    2020-11-01 | PDF
    The main objective of this research was to quantify the material strain limits for seismic assessment of existing sub-standard reinforced concrete bridge bents considering operational performance design criteria. Limited confidence exists in the current material strain limit state for operational performance criteria due to lack of experimental res ...
  • Evaluating Performance of Concrete Overlays for Pavement Rehabilitation
    Evaluating Performance of Concrete Overlays for Pavement Rehabilitation
    Grogg, Max ;
    Espinoza-Luque, Arturo
    2020-11-01 | PDF
    The Missouri Department of Transportation (MoDOT) has a long history of concrete overlay use dating back to at least the 1930s, and over the last 20 years has constructed over 40 concrete overlay projects in a range of applications. The goal of this study was to review and evaluate the performance of bonded and unbonded overlays constructed in Miss ...
  • Demonstration Project for Enhanced Durability of Asphalt Pavements through Increased InPlace Pavement Density
    Demonstration Project for Enhanced Durability of Asphalt Pavements through Increased In-Place Pavement Density
    Aschenbrener, Tim ;
    Brown, E Ray
    2020-11-01 | PDF
    Recognizing the importance of in-place density in building cost effective asphalt pavements, a Federal Highway Administration (FHWA) Demonstration Project was created for “Enhanced Durability of Asphalt Pavements through Increased In-place Pavement Density.” Based on prior studies, a one-percent decrease in air voids achieved through improved compa ...
  • Assessment of Consultant Plan Development and Performance Rating Processes
    Assessment of Consultant Plan Development and Performance Rating Processes
    Hamilton, Ron ;
    Leary, Caroline
    2020-11-01 | PDF
    High-quality engineering plans are essential: errors and omissions in design plans can impact public safety, cause construction delays, and cost overruns. The Louisiana Department of Transportation and Development (DOTD) undertook an assessment of its consultant plan development and consultant rating processes to identify opportunities for improvin ...
  • Pedestrian Crossings and Safety on Four Anishinaabe Reservations in Minnesota
    Pedestrian Crossings and Safety on Four Anishinaabe Reservations in Minnesota
    Lindsey, Greg ;
    Hourdos, John
    2020-11-01 | PDF
    The Minnesota Department of Transportation (MnDOT) has identified Native American as one of six priority populations in the state that face disproportionate risks as pedestrians. This report summarizes results from observations of pedestrian crossing behaviors on four Anishinaabe reservations in northern Minnesota. The University of Minnesota Traff ...
  • Timber Crosstie Spike Fastener Failure Investigation Field Evaluation of an Alternative Fastener Research Results
    Timber Crosstie Spike Fastener Failure Investigation: Field Evaluation of an Alternative Fastener [Research Results]
    Stuart, Cameron ;
    Dersch, Marcus S.
    2020-11-01 | PDF
    The Federal Railroad Administration has sponsored the Rail Transportation and Engineering Center (RailTEC) at the University of Illinois at Urbana-Champaign (Illinois) to conduct a comprehensive investigation into timber crosstie spike fastener failures on North American railroads. As a part of this project, researchers conducted a field evaluation ...
  • Chloride Concentration and Blowthrough Analyses for Concrete Bridge Deck Rehabilitation Using Hydrodemolition
    Chloride Concentration and Blow-through Analyses for Concrete Bridge Deck Rehabilitation Using Hydrodemolition
    Guthrie, W Spencer ;
    Roper, Elizabeth A
    2020-11-01 | PDF
    The objectives of this research were 1) to investigate the effects of hydrodemolition treatment timing on chloride concentration profiles in concrete bridge decks for depths of concrete removal below the top mat of reinforcing steel and 2) to investigate factors that influence the occurrence of blow-throughs in concrete bridge decks when hydrodemol ...
  • Dynamic Performance of Cantilevered Sign Trusses for Fatigue
    Dynamic Performance of Cantilevered Sign Trusses for Fatigue
    Senior, Hunter ;
    Bennett, Caroline
    2020-11-01 | PDF
    Cantilevered overhead sign structures (COSS) experience cyclic loading due to stochastic loads such as natural wind gusts (NWG). Wind loading can produce large deflections in the cantilever and large-magnitude stresses can develop at the box-type connection between the cantilevered arm and mast where fatigue performance is a concern. Modifications ...
    Supporting Files
  • Integrate RTMC Vehicle Classification Into the Current Detector Volume Data
    Integrate RTMC Vehicle Classification Into the Current Detector Volume Data
    Kwon, Taek M.
    2020-11-01 | PDF
    Collection of vehicle classification data is considered an essential part of traffic monitoring programs. The objective of this project is to integrate the raw classification data generated by the Minnesota Department of Transportation (MnDOT) Regional Transportation Management Center (RTMC) into the existing volume data managed by the Traffic Fore ...
  • Domestic Airline Fares Consumer Report First Quarter 2020 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: First Quarter 2020 Passenger and Fare Information
    United States. Department of Transportation
    2020-11-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Stainless Steel Strands and Lightweight Concrete for Pretensioned Concrete Girders Final Report B Lightweight Concrete
    Stainless Steel Strands and Lightweight Concrete for Pretensioned Concrete Girders (Final Report B – Lightweight Concrete)
    Rambo-Roddenberry, Michelle ;
    Al-Kaimakchi, Anwer
    2020-11-01 | PDF
    Benefits of lightweight concrete include reduction in the self-weight of the girder and reduction in transportation and handling costs, as well as potentially longer spans. Lightweight concrete can be produced with strength equivalent to normal-weight concrete. However, FDOT does not currently have an approved lightweight concrete mix for girders. ...
  • Infrastructure Needs North Dakotas County Township and Tribal Roads and Bridges 20212040
    Infrastructure Needs: North Dakota's County, Township and Tribal Roads and Bridges: 2021-2040
    Dybing, Alan ;
    Lu, Pan
    2020-11-01 | PDF
    This report is the response to the North Dakota Legislature's request for a study of the transportation infrastructure needs of all county and township roads in the state. In this report, infrastructure needs are estimated using the most current production forecasts, traffic estimates, and roadway inventory and condition data available. Agricultura ...
  • Developing a Small Airport Economic Impact Estimator Project Summary
    Developing a Small Airport Economic Impact Estimator [Project Summary]
    Borowiec, Jeffrey D. ;
    Glover, Brianne
    2020-10-31 | PDF
    The research team found that building an estimator tool that can be tailored to each airport provides more precise estimates of that airport’s impact. The model and tool move beyond the statewide study by using region-specific estimates and inputs, where possible, and allowing for user input when conditions have changed since the last statewide eco ...
  • Real-World Use of Automated Driving Systems and their Safety Consequences: A Naturalistic Driving Data Analysis [supporting datasets]
    Kim, Hyungil ;
    Song, Miao
    2020-10-31 | PDF
    Automated driving systems (ADS) have the potential to fundamentally transform transportation by reducing crashes, congestion, and cost while improving traffic efficiency and access to mobility for the transportation-challenged population. However, people may not use ADS as intended due to their misunderstanding of such systems’ capabilities and lim ...
    Dataset Supporting Files
  • Roadside Safety Device Analysis Testing and Evaluation Program Project Summary
    Roadside Safety Device Analysis, Testing, and Evaluation Program [Project Summary]
    Bligh, Roger P. ;
    Abu-Odeh, Akram
    2020-10-30 | PDF
    Roadway departure crashes represent approximately 50 percent of fatalities on Texas roadways each year. Roadside safety devices shield motorists from roadside hazards such as non-traversable terrain and fixed objects, thereby reducing injuries and fatalities associated with roadway departure crashes. Development of new or improved roadside safety d ...
  • Uncertainty Analysis in Rock Mass Classification and Its Application to Reliability Evaluation in Tunnel Construction
    Uncertainty Analysis in Rock Mass Classification and Its Application to Reliability Evaluation in Tunnel Construction
    Lu, Hui ;
    Gutierrez, Marte
    2020-10-30 | PDF
    With the increasing demand for tunnels in sensitive urban environments, pressure balance mechanized tunneling is employed in most soft ground tunnel construction projects. Segmental tunnel lining is used in pressure balance mechanized tunneling as temporary and final support. With common service life requirements of 100 and even 150 years, efficien ...
  • Distribution Roosting and Foraging Ecology and Migration Pathways for Gray Bats in Western North Carolina
    Distribution, Roosting and Foraging Ecology, and Migration Pathways for Gray Bats in Western North Carolina
    Weber, Joey A. ;
    O'Keefe, Joy M.
    2020-10-30 | PDF
    The authors conducted a two-year study to assess the distribution, roosting and foraging ecology, migratory movements, and winter habits of gray bats (Myotis grisescens) in the French Broad River Basin of western North Carolina. By August 2020, the authors knew of 37 roosts in the basin. Gray bats actively forage across the basin, but activity is h ...
  • TDOT Bicycle Pedestrian Counting Best Methodologies Assessment
    TDOT Bicycle & Pedestrian Counting: Best Methodologies Assessment
    Shah, Nitesh ;
    Cherry, Christopher
    2020-10-30 | PDF
    Transportation agencies throughout the United States are systematically counting bicycles and pedestrians to plan, fund, and evaluate nonmotorized infrastructure. This project evaluated nonmotorized count methods and technologies and developed recommendations to integrate them into Tennessee's statewide count program. We first did a nationwide scan ...
  • Remote Sensing in Maintenance Work
    Remote Sensing in Maintenance Work
    Bitzan, Nicole ;
    Marti, Michael
    2020-10-30 | PDF
    Safety for the general public and Department workers is a key value within Minnesota Department of Transportation (MnDOT). As MnDOT works within its right-of-way (ROW), that safety concern extends to the safety needs of maintenance staff in field work, as well as those of the unsheltered homeless population, who may camp on MnDOT’s ROW. Therefore, ...
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