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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 4141 - 4160 of 36011 results
  • Application of Dynamic Crash Prediction Methodologies to FDOT Safety and Transportation System Management Operation TSMO Programs
    Application of Dynamic Crash Prediction Methodologies to FDOT Safety and Transportation System Management & Operation (TSM&O) Programs
    Wang, Zhenyu ;
    Lin, Pei-Sung
    2020-11-01 | PDF
    Dynamic crash prediction, a proactive safety management strategy, predicts crash risk based on prevailing traffic conditions and prevents crashes before occurrence. As an innovative technology, dynamic crash prediction provides a potential way for the Florida Department of Transportation (FDOT) to take advantage of information provided by intellige ...
  • Phase II Investigation of Recycled Tire Chips and Fiber Reinforcement for Use in GDOT Concrete Used To Construct Barrier Walls and Other Applications
    Phase II – Investigation of Recycled Tire Chips and Fiber Reinforcement for Use in GDOT Concrete Used To Construct Barrier Walls and Other Applications
    Durham, Stephan A. ;
    Chorzepa, Mi G
    2020-11-01 | PDF
    Concrete median barriers (CMBs) are installed to decrease the overall severity of traffic accidents by producing higher vehicle decelerations. In 2016, an update to the AASHTO Manual for Assessing Safety Hardware (MASH) saw a 58.00 percent increase in impact severity of test level 4 (TL-4) impact conditions when compared to the NCHRP Report 350 tes ...
  • Preventing Crashes in Mixed Traffic With Automated and HumanDriven Vehicles
    Preventing Crashes in Mixed Traffic With Automated and Human-Driven Vehicles
    Talebpour, Alireza ;
    Lord, Dominique
    2020-11-01 | PDF
    Reducing crash counts on saturated road networks is one of the most significant benefits of autonomous vehicle(AV) technology. To date, many researchers have studied how AVs maneuver in different traffic situations, but less attention has been paid to car-following scenarios between AVs and human drivers. Braking and accelerating decision mismatche ...
  • Evaluation of StreetLight Datas Traffic Count Estimates From Mobile Device Data
    Evaluation of StreetLight Data’s Traffic Count Estimates From Mobile Device Data
    Turner, Shawn ;
    Tsapakis, Ioannis
    2020-11-01 | PDF
    In this study, the Texas A&M Transportation Institute (TTI) conducted an independent, follow-up evaluation of StreetLight Data’s 2019 traffic count estimates using MnDOT sources of traffic count data. At 442 permanent benchmark locations, TTI found that average annual daily traffic ( AADT) estimation accuracy by StreetLight Data has improved signif ...
  • NonContact Scour Monitoring for Highway Bridges
    Non-Contact Scour Monitoring for Highway Bridges
    Nagarajan, Sudhagar ;
    Arockiasamy, Madasamy
    2020-11-01 | PDF
    The most common cause of bridge failures in the United States is from floods scouring bed material around bridge foundations. Bridge scour due to hydraulic forces accounts for 52% of bridge failures. Increasing occurrences of flood events and an increase in their magnitude will likely result in greater instances of scour damage to bridges. A signif ...
  • Analysis of Demographic Socioeconomic and Regional Difference in TDOT Customer Satisfactions Survey
    Analysis of Demographic, Socioeconomic, and Regional Difference in TDOT Customer Satisfactions Survey
    Ivey, Stephanie ;
    Milligan, Jake
    2020-11-01 | PDF
    The Tennessee Department of Transportation (TDOT) has conducted three statewide residential customer surveys (2006, 2013, 2016) to aid in identifying and assessing satisfaction with transportation services. This research focused on demographic analysis of the Tennessee Department of Transportation’s previous residential survey data with the goals o ...
  • Expedited Process for Developing Specifications on New Products
    Expedited Process for Developing Specifications on New Products
    CTC & Associates LLC
    2020-11-01 | PDF
    It is common practice for transportation agencies to assert a degree of authority over the products and materials that are used to perform work on public property in an effort to ensure the state’s standards for quality, performance, efficiency or other criteria are met. The process by which products achieve sanctioned use varies, with some states ...
  • Evaluation of Concrete Bridge Decks Comprising Twisted Steel Micro Rebar
    Evaluation of Concrete Bridge Decks Comprising Twisted Steel Micro Rebar
    Guthrie, W Spencer ;
    Hebdon, Aubrey L
    2020-11-01 | PDF
    The objective of this research was to investigate the effects of twisted steel micro rebar (TSMR) fibers on 1) the mechanical properties of concrete used in bridge deck construction and 2) the early cracking behavior of concrete bridge decks. This research involved the evaluation of four newly constructed bridge decks through a series of laboratory ...
  • 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. ...
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