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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 7421 - 7440 of 36114 results
  • Frequency and Potential Severity of Red Light Running in Anchorage Phase II
    Frequency and Potential Severity of Red Light Running in Anchorage – Phase II
    Abaza, Osama ;
    Chowdhury, Tanay Datta
    2017-12-01 | PDF
    Red light running (RLR) is among the leading causes of urban automobile crashes, and the rate of related crashes is increasing. Phase I of the Alaska RLR project was independently conducted by the UAA Civil Engineering Department (Abaza and Strait, 2014). The findings of the Phase I study warranted further investigation as part of this project (Pha ...
  • Balanced Asphalt Concrete Mix Performance Phase II Analysis of BBR and SCB Tests
    Balanced Asphalt Concrete Mix Performance, Phase II: Analysis of BBR and SCB Tests
    Romero, Pedro ;
    VanFrank, Kevin
    2017-12-01 | PDF
    An evaluation of the ability of the BBR and the IFIT tests to determine changes in asphalt mixture parameters was conducted as well as the possible implications of adoption these two tests at low and intermediate temperatures. It was found that the FI from the IFIT was a more sensitive parameter than the creep modulus or m-value from the BBR to det ...
  • Corrosion Map for Metal Pipes in Coastal Louisiana Tech Summary
    Corrosion Map for Metal Pipes in Coastal Louisiana : Tech Summary
    Tewari, Sanjay
    2017-12-01 | PDF
    The objective of this project was to create a guidance document with maps that delineates zones where metal pipe is prone to increased corrosion due to environmental conditions. Results from this project will provide a logical rationale to support DOTD restricting the use of the metal drainage pipe in certain areas.
  • Development of NonProprietary UltraHigh Performance Concrete Project Summary Report
    Development of Non-Proprietary Ultra-High Performance Concrete : Project Summary Report
    Berry, Michael ;
    Snidarich, Richard
    2017-12-01 | PDF
    Ultra-high performance concrete (UHPC) has mechanical and durability properties that far exceed those of conventional concrete. Thus, elements made with UHPC can be thinner/lighter than elements made with conventional concrete. The enhanced durability properties of UHPC also allow for longer service lives and decreased maintenance costs. However, u ...
  • Advanced Analysis Validation and Optimization of Virtual Cement and Concrete Testing
    Advanced Analysis, Validation, and Optimization of Virtual Cement and Concrete Testing
    Ferraro, Christopher C. ;
    Watts, Benjamin E.
    2017-12-01 | PDF
    Computational models that predict the behavior of cement and concrete seek to reduce industry reliance on predictive empirical relationships through simulation of the micro-scale chemical and thermal phenomena of cement hydration and their influence on macro-scale material properties. Models such as the Virtual Cement and Concrete Testing Laborator ...
  • A Comprehensive Technology Assessment for Highway Avalanche Hazard Management Choosing the Right Tool for the Job
    A Comprehensive Technology Assessment for Highway Avalanche Hazard Management : Choosing the Right Tool for the Job
    Decker, Rand
    2017-12-01 | PDF
    There are a dozen different technologies that can be naturally sub-divided into two very different avalanche control and defense paradigms that can be used to manage avalanche hazards on mountain highways: active avalanche control and passive/constructed avalanche defense. The Wyoming Department of Transportation’s (WYDOT) avalanche control and def ...
  • Improving AnimalVehicle Collision Data for the Strategic Application of Mitigation
    Improving Animal-Vehicle Collision Data for the Strategic Application of Mitigation
    Donaldson, Bridget M.
    2017-12-01 | PDF
    Virginia is consistently among the 10 states with the highest number of deer-vehicle collisions (DVCs), with more than 61,000 reported for the year ending June 30, 2016. Whereas DVCs represented 1 in 11 of the vehicle insurance claims nationwide in 2014, they represented 1 in 6 of the claims in Virginia. Although the insurance data provide some inf ...
  • Pilot Implementation of Whitetopping Final Report
    Pilot Implementation of Whitetopping : Final Report.
    Zhou, Wujun ;
    Choi, Pangil
    2017-12-01 | PDF
    The design of whitetopping has been based on experience. The current TxDOT whitetopping design is based on American Concrete Pavement Association (ACPA), which does not consider the condition of existing asphalt pavement. Recognizing the limitations of this procedure, TxDOT sponsored a research study to develop mechanistic-empirical pavement design ...
  • Analyzing Driver Behavior in Passing Zones with Differential Speed Limits on TwoLane TwoWay Undivided Highways in Alaska
    Analyzing Driver Behavior in Passing Zones with Differential Speed Limits on Two-Lane Two-Way Undivided Highways in Alaska
    Abaza, Osama ;
    Lang, Robert J.
    2017-12-01 | PDF
    Due to the relatively high crash rates attributed to two lane highways in Alaska, solutions have been explored to improve safety by providing passing lanes to give drivers a better chance to pass the slow moving vehicles. Drivers of slow moving vehicles tend to drive at higher speed on the more level passing lanes reducing the chance of other to pa ...
  • Corrosion Map for Metal Pipes in Coastal Louisiana
    Corrosion Map for Metal Pipes in Coastal Louisiana
    Tewari, Sanjay
    2017-12-01 | PDF
    Transportation agencies often allow metal pipes as an option for cross drains under/along roads and highways. Metal culverts can corrode over time at various rates based on their environmental conditions (e.g., corrosive nature of coastal soils, high water table, and saltwater intrusion). This project was focused on applying available soil data, su ...
  • Implementation of a Refined Shear Rating Methodology for Prestressed Concrete Girder Bridges
    Implementation of a Refined Shear Rating Methodology for Prestressed Concrete Girder Bridges
    Snyder, Richard ;
    Beisswenger, Jamison
    2017-12-01 | PDF
    Lower than desirable shear ratings at the ends of prestressed concrete beams have been the topic of ongoing research between MnDOT and the University of Minnesota. A recent study by the University of Minnesota entitled Investigation of Shear Distribution Factors in Prestressed Concrete Girder Bridges (French et al., 2016) sought to increase the she ...
  • Mitigating Joint Reflective Cracks using Stone Interlayers Case Study on Louisiana Highway 5 Desoto Parish Research Project Capsule
    Mitigating Joint Reflective Cracks using Stone Interlayers : Case Study on Louisiana Highway 5, Desoto Parish : Research Project Capsule
    Gaspard, Kevin
    2017-12-01 | PDF
    When Portland cement concrete (PCC) pavement reaches an intolerable level of service, it is commonly overlaid with asphaltic concrete (AC) and is referred to as a composite pavement. Even though AC overlays are designed to resist failure mechanisms such as fatigue cracking and rutting, underlying cracks in the PCC pavement, particularly at joints, ...
  • Development of a Traffic Management Decision Support Tool for Freeway Incident Traffic Management FITM Plan Deployment Research Summary
    Development of a Traffic Management Decision Support Tool for Freeway Incident Traffic Management (FITM) Plan Deployment : Research Summary
    Chang, Gang-Len
    2017-12-01 | PDF
    In designing an effective traffic management plan for non-recurrent congestion, it is critical for responsible highway agencies to have some vital information, such as estimated incident duration, resulting traffic queues, and the expected delays. Over the past two decades, despite the popular implementation of incident response programs by most hi ...
  • Temperature Control Requirements for the Construction of Mass Concrete Members
    Temperature Control Requirements for the Construction of Mass Concrete Members
    Gross, Eric D ;
    Eiland, Andrew D
    2017-12-01 | PDF
    Special precautions must be taken when constructing concrete elements designated as mass concrete. These precautions may be satisfied through the formation of a mass concrete specification. Temperature requirements must be established to mitigate thermal cracking and delayed ettringite formation (DEF), both of which cause premature deterioration of ...
  • Detection of Multiple Flaws in Concrete Bridge Decks Using Ultrasonic Wave Propagation
    Detection of Multiple Flaws in Concrete Bridge Decks Using Ultrasonic Wave Propagation
    Erdogmus, Ece ;
    Garcia, Eric
    2017-12-01 | PDF
    The objectives of the current research were: to identify and monitor the rebar in reinforced concrete bridge decks for the onset of corrosion; use the same equipment and set-up to identify and monitor the onset of cracking in concrete; to identify existing, and monitor the onset of, multiple types of early-stage flaws; and to evaluate this testing ...
  • Development of Statewide Guidelines for Implementing Leading Pedestrian Intervals in Florida
    Development of Statewide Guidelines for Implementing Leading Pedestrian Intervals in Florida
    Lin, Pei-Sung ;
    Wang, Zhenyu
    2017-12-01 | PDF
    Pedestrian safety is an ongoing major concern throughout the United States and is one of the highest priorities for the Florida Department of Transportation (FDOT). Vehicles often fail to yield to pedestrians at intersections, especially when pedestrians enter an intersection with a corresponding green signal in the same direction of vehicle travel ...
  • Development of Mix Designs for RAP Concrete for Florida Concrete Test Road
    Development of Mix Designs for RAP Concrete for Florida Concrete Test Road
    Tia, Mang ;
    Han, Sangyoung
    2017-12-01 | PDF
    The main objective of this study was to develop mix designs for concrete incorporating Reclaimed Asphalt Pavement (RAP) materials to be used in the Florida Concrete Test Road. Two different FDOT-approved RAP sources were selected and used in this study. Concrete mixtures with 0% to 40% RAP as aggregate replacement, using 0% and 20% fly ash as cemen ...
    Supporting Files
  • Design of a 3D Magnetic Mapping System to Locate Reinforcing Steel in Concrete Pavements Technical Summary
    Design of a 3-D Magnetic Mapping System to Locate Reinforcing Steel in Concrete Pavements : Technical Summary
    Holle, Nathanael W.
    2017-12-01 | PDF
    This report outlines the design, fabrication, and testing of a 3-D magnetic mapping system used to locate reinforcing steel in concrete pavements developed at Kansas State University (KSU) in 2006. The magnetic sensing functionality is based on the principles of magnetic tomography which use time-varying magnetic fields to induce magnetic returns f ...
  • Bumps in High Speed Rails What is Tolerable
    Bumps in High Speed Rails : What is Tolerable?
    Briaud, Jean-Louis
    2017-12-01 | PDF
    California is planning a high speed train (HST) to link Los Angeles, San Francisco, and Sacramento. Texas is planning a high speed train to link Houston to Dallas. In both cases, the embankments and bridges over which the train will travel are likely to develop bumps arising from subgrade soil movements. What is a tolerable bump for a train travell ...
  • The Use of Porous Concrete for Sidewalks Technical Brief
    The Use of Porous Concrete for Sidewalks [Technical Brief]
    New Jersey. Dept. of Transportation. Bureau of Research
    2017-12-01 | PDF
    This project evaluated the use of porous concrete for sidewalks in New Jersey in terms of structural performance, hydrological performance, lifecycle costs, durability, maintenance, and energy performance
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