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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 181 - 200 of 35440 results
  • Development of a Standard Practice for the Design of Durable OpenGraded Friction Course OGFC Mixtures with Epoxy Asphalt
    Development of a Standard Practice for the Design of Durable Open-Graded Friction Course (OGFC) Mixtures with Epoxy Asphalt
    Mohammad, Louay N. ;
    Abualia, Anas
    2025-06-01 | PDF
    Open-graded friction course (OGFC) is a thin asphalt mixture surface layer. It is gap-graded with a high percentage of coarse aggregates that are nearly uniform in size, resulting in a high percentage of interconnected air voids and asphalt binder, which provides improved skid resistance, visibility, and decreased pavement-tire noise. However, cons ...
  • Development of a Standard Practice for the Design of OpenGraded Friction Course OGFC Mixtures with Epoxy Asphalt Technical Summary
    Development of a Standard Practice for the Design of Open-Graded Friction Course (OGFC) Mixtures with Epoxy Asphalt [Technical Summary]
    Mohammad, Louay N.
    2025-06-01 | PDF
    Open-graded friction course (OGFC) is a thin asphalt mixture surface layer. It is gap-graded with a high percentage of coarse aggregates that are nearly uniform in size, resulting in a high percentage of interconnected air voids and asphalt binder, which provides improved skid resistance, visibility, and decreased pavement-tire noise. However, cons ...
  • A New Generation of Porous Asphalt Pavement OGFC Support Study Technical Summary
    A New Generation of Porous Asphalt Pavement: OGFC Support Study [Technical Summary]
    Elseifi, Mostafa A.
    2025-06-01 | PDF
    The objective of this study was to develop and evaluate a new generation of open-graded friction courses (OGFC) that would provide superior durability performance while preserving the functional benefits of the mix. Additionally, a Finite Element (FE) model was developed and used to propose new air voids (AV) guidelines for OGFC applications in Lou ...
  • Behavior of the Expanded Polystyrene Elastic Inclusion at Integral Abutments
    Behavior of the Expanded Polystyrene Elastic Inclusion at Integral Abutments
    Tanyu, Burak F ;
    Guler, F Erol
    2025-06-01 | PDF
    This report presents the findings of a laboratory study conducted by the Sustainable Geotransportation/Geoenvironmental Infrastructure (SGI) Research Group at George Mason University. The research focused on investigating the ability of standard (S) and elasticized (E) expanded polystyrene (EPS) to provide elastic inclusion in integral abutments. E ...
  • Estimating Disadvantaged Populations Based on Public Data
    Estimating Disadvantaged Populations Based on Public Data
    Xu, Yiqing ;
    Dougald, Lance E
    2025-06-01 | PDF
    This report develops robust estimation models to address data challenges for identifying disadvantaged populations, defined by low-income, racial minority, and limited English proficiency (LEP) status, which aligns with the Virginia Department of Transportation’s (VDOT) SMART SCALE definition. The current reliance on American Community Survey data ...
  • Field Evaluation of Reinforced Concrete Repairs Using Hydrodemolition Galvanic Cathodic Protection or Impressed Current Cathodic Protection
    Field Evaluation of Reinforced Concrete Repairs Using Hydrodemolition, Galvanic Cathodic Protection, or Impressed Current Cathodic Protection
    Sharp, Stephen R ;
    Ozyildirim, Celik
    2025-06-01 | PDF
    For the Virginia Department of Transportation (VDOT), substructure repairs are costly, and the durability is a concern. Current conventional concrete removal methods commonly use chipping hammers and shotcrete or self-consolidating concrete (SCC), plus discrete galvanic point (DGP) anodes, for such repairs. The types of concrete VDOT uses in these ...
  • A New Generation of Porous Asphalt Pavement OGFC Support Study
    A New Generation of Porous Asphalt Pavement – OGFC Support Study
    Elseifi, Mostafa A. ;
    Abohamer, Hossam
    2025-06-01 | PDF
    The objective of this study was to develop and evaluate a new generation of open-graded friction courses (OGFC) that would provide superior durability performance while preserving the functional benefits of the mix. Additionally, a Finite Element (FE) model was developed and used to propose new air voids (AV) guidelines for OGFC applications in Lou ...
  • Evaluation of A Truck InCab Alert System
    Evaluation of A Truck In-Cab Alert System
    Goodall, Noah J. ;
    Lan, Chien-Lun
    2025-06-01 | PDF
    Transportation agencies have long communicated directly with truck drivers regarding weigh station compliance and parking availability, sometimes making use of applications provided by private third-party partners. One of these applications has expanded capabilities that allow agencies to transmit safety alerts directly to drivers through the in-ca ...
  • Solar Snow Fence Controls Drifting Snow While Generating Power Implementation Summary
    Solar Snow Fence Controls Drifting Snow While Generating Power [Implementation Summary]
    Yang, Mijia ;
    Gullickson, Dan
    2025-06-01 | PDF
    A 100-ft field implementation of the proposed solar snow fence was conducted In Glyndon, MN. The implementation process started with the manufacturing of solar stripe frames, U connection with steel posts, helical piling, electrical power harvest and storage, electrical use in snow melting, and monitoring of the solar snow fence systems. A 12-ft la ...
  • Enhancing Safety for Pedestrians and Bicyclists at Roundabouts Research Summary
    Enhancing Safety for Pedestrians and Bicyclists at Roundabouts [Research Summary]
    Savolainen, Peter T. ;
    Wagner, Mark
    2025-06-01 | PDF
    Roundabouts have been shown to enhance safety by lowering travel speeds as compared to other intersection designs. However, pedestrian and bicyclist crossings at roundabouts present unique challenges. Low yielding rates can heighten the risk of crashes, especially at entry and exit points. This study examines driver yielding behavior toward pedestr ...
  • Identify Best Locations for New FlexRoute Projects Throughout the State of Michigan
    Identify Best Locations for New Flex-Route Projects Throughout the State of Michigan
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2025-06-01 | PDF
    Part-time shoulder use (PTSU) has emerged as an effective lane-use strategy to mitigate both recurrent and non-recurrent congestion. Given the operational and safety benefits associated with the US-23 Flex Route, this research project focused on evaluating the feasibility of PTSU on selected freeway corridors in Michigan that are prone to such cong ...
  • Assessment of LongTerm Performance of Louisiana Asphalt Pavements
    Assessment of Long-Term Performance of Louisiana Asphalt Pavements
    Mohammad, Louay N. ;
    Akentuna, Moses
    2025-06-01 | PDF
    This study investigated the effectiveness of various enhanced asphalt mixture designs and construction techniques used in Louisiana since 1994, evaluating to what degree they improved long-term performance. 24 field projects were evaluated, focusing on how these enhancements impacted rutting, cracking, ride quality, and overall pavement performance ...
  • Development of a Cyclic SemiCircular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature
    Development of a Cyclic Semi-Circular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature
    Mohammad, Louay N. ;
    Ma, Ye
    2025-06-01 | PDF
    The Semi-Circular Bend (SCB) test has traditionally been conducted in a monotonic loading and displacement-controlled mode at intermediate temperatures to assess the fatigue crack resistance of asphalt mixtures. However, fatigue damage is essentially the deterioration of material integrity as a result of repeated loading. The monotonic loading of t ...
  • Assessment of LongTerm Performance of Louisiana Asphalt Pavements Summary
    Assessment of Long-Term Performance of Louisiana Asphalt Pavements [Summary]
    Mohammad, Louay N.
    2025-06-01 | PDF
    This study investigated the effectiveness of various enhanced asphalt mixture designs and construction techniques used in Louisiana since 1994, evaluating to what degree they improved long-term performance. 24 field projects were evaluated, focusing on how these enhancements impacted rutting, cracking, ride quality, and overall pavement performance ...
  • Development of a Cyclic SemiCircular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature Summary
    Development of a Cyclic Semi-Circular Bend Test to Evaluate Asphalt Mixture Crack Propagation Properties at Intermediate Temperature [Summary]
    Mohammad, Louay N.
    2025-06-01 | PDF
    The Semi-Circular Bend (SCB) test has traditionally been conducted in a monotonic loading and displacement-controlled mode at intermediate temperatures to assess the fatigue crack resistance of asphalt mixtures. However, fatigue damage is essentially the deterioration of material integrity as a result of repeated loading. The monotonic loading of t ...
  • Seismically Resilient Bridge Bents with Stretch Length Anchors as Energy Dissipators
    Seismically Resilient Bridge Bents with Stretch Length Anchors as Energy Dissipators
    Neupane, Suman ;
    Pantelides, Chris P.
    2025-06-01 | PDF
    Accelerated bridge construction (ABC) using precast concrete bents has substantial potential to improve construction time and seismic performance in earthquake-prone regions. This study investigates the seismic performance of hybrid self-centering bridge bents that employ unbonded post-tensioning (PT) bars for self-centering and replaceable stretch ...
  • Rural Transit Fact Book 2025
    Rural Transit Fact Book 2025
    Mattson, Jeremy ;
    Peterson, Del
    2025-06-01 | PDF
    Public transportation plays a fundamental role in the livability of communities of all sizes. The Rural Transit Fact Book provides information on transit service availability and cost to help the transit industry in the United States provide efficient and effective service to meet rural community mobility needs. Financial and operating statistics c ...
  • Testing Survey Methods for Detecting Bats Roosting in Bridges Research Summary
    Testing Survey Methods for Detecting Bats Roosting in Bridges [Research Summary]
    Roby, Piper
    2025-06-01 | PDF
    Bats are a critical component of our natural world, and many species are at risk. Protecting roosting habitat is one way we can help conserve a variety of species. Although many bats use natural roosts, a growing number are adapting to anthropogenic structures due to habitat encroachment. In this study, we tested methods for detecting bats using br ...
  • Shear Wave Velocity Measurements Research Summary
    Shear Wave Velocity Measurements [Research Summary]
    Torgashov, Evgeniy V.
    2025-06-01 | PDF
    The Missouri Department of Transportation (MoDOT) commissioned SCI Engineering, Inc. to investigate cost-effective, non-intrusive geophysical methods for determining time-averaged shear wave velocity (Vs) profiles to a depth of 100 feet, based on anticipated updates to AASHTO seismic site classification specifications. Following a comprehensive lit ...
  • Understanding WildlifeVehicle Collisions in Illinois
    Understanding Wildlife-Vehicle Collisions in Illinois
    Stodola, Kirk W ;
    Finney, Noah I
    2025-06-01 | PDF
    Wildlife-vehicle collisions are a common and costly occurrence on U.S. roadways. An estimated 1 million vertebrates are killed on American roads each day. Most wildlife-vehicle collisions of importance occur with deer. The goal of the proposed research is to better understand wildlife-vehicle collisions in Illinois and to identify mitigation strate ...
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