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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 581 - 600 of 35811 results
  • Use of XRay Fluorescence XRF to Determine Tire Rubber Content in Asphalt Binders
    Use of X-Ray Fluorescence (XRF) to Determine Tire Rubber Content in Asphalt Binders
    Bhasin, Amit ;
    Filonzi, Angelo
    2025-01-01 | PDF
    This work involved making a portable X-Ray Fluorescence Spectroscopy device available to district personnel and training them to use the device on a routine basis to analyze tire rubber-modified asphalt binder for tire rubber content. The Performing Agency worked with the Receiving Agency and producers from around the state to develop calibration s ...
  • An Integrated Online Application for SiteManager and Pavement Analyst
    An Integrated Online Application for SiteManager and Pavement Analyst
    Rahman, Syeda ;
    Bhasin, Amit
    2025-01-01 | PDF
    The objectives of this study were to integrate material, construction, maintenance, and performance information, and to deploy the unified data on a commercial system licensed by TxDOT so that Division and District personnel can access and interact with these data. Data from the SMGR, PA, and DCIS databases were identified, integrated, and processe ...
  • Updating Rainfall Zones and Intensities in Nebraska for Improved Design of Nonbridgesized Drainage Structures
    Updating Rainfall Zones and Intensities in Nebraska for Improved Design of Non-bridge-sized Drainage Structures
    Mahmood, Rezaul ;
    Roy, Tirthankar
    2025-01-01 | PDF
    This study assesses the effectiveness of precipitation zones and Intensity-Duration-Frequency (IDF) curves used by the Nebraska Department of Transportation (NDOT) for designing drainage structures. Twenty stations were selected for the analysis of revised IDF curves out of forty-two stations. Datasets have been considered from the National Center ...
  • Performance Evaluation of Safe Mobility for Life Coalitions Outreach Activities to Benefit Aging Road Users
    Performance Evaluation of Safe Mobility for Life Coalition’s Outreach Activities to Benefit Aging Road Users
    Alluri, Priyanka ;
    Mdimi, Odilo
    2025-01-01 | PDF
    As Florida’s aging population increases, the demand to ensure safe mobility for older adults also increases, especially since aging road users are vulnerable to serious and fatal crashes. Over 20% of Florida residents are aged 65 or older, and this number is projected to increase by 2045. Age is linked with a decline in vision, cognition, and react ...
  • A Systematic Evaluation of Generative Models on Tabular Transportation Data
    A Systematic Evaluation of Generative Models on Tabular Transportation Data
    Wang, Chengen ;
    Cardenas, Alvaro A.
    2025-01-01 | PDF
    The sharing of large-scale transportation data is beneficial for transportation planning and policymaking; however, there are privacy concerns with data sharing, as it can include identifiable personal information, such as individuals’ home locations. To address these concerns, synthetic data generation based on real transportation data offers a pr ...
  • Moving Forward Ohio Department of Transportation Research Program Newsletter Fall 2025 Volume 2
    Moving Forward: Ohio Department of Transportation Research Program Newsletter: Fall 2025 Volume 2
    Ohio’s Research Initiative for Locals
    2025-01-01 | PDF
    ODOT’s Research Newsletter is designed to provide practice-ready solutions to real-world issues facing Ohio’s local transportation system through research. It’s a multi-organizational collaborative effort to improve the transportation network in Ohio’s counties, townships, cities and villages.
  • Control Guidelines for Aggregate Drainage Layers and Evaluation of InSitu Permeability Testing Methods for Aggregates Brief
    Control Guidelines for Aggregate Drainage Layers and Evaluation of In-Situ Permeability Testing Methods for Aggregates [Brief]
    Santagata, Maria C. ;
    Becker, Peter J.
    2025-01-01 | PDF
    This project examined the use of the light weight deflectometer (LWD) and the air permeameter test (APT) for control of the state of compaction and hydraulic conductivity of aggregate drainage layers. The investigation included an extensive program of LWDs, APTs, and nuclear density tests on two testing strips constructed at an experimental site—on ...
  • Monitoring of a SteelReinforced MSE Abutment Wall and Evaluation of its Bearing Capacity Based on the CPT and DCPT
    Monitoring of a Steel-Reinforced MSE Abutment Wall and Evaluation of its Bearing Capacity Based on the CPT and DCPT
    Sakleshpur, Venkata Abhishek ;
    Prezzi, Monica
    2025-01-01 | PDF
    A two-span bridge, supported by steel H-piles and mechanically stabilized earth (MSE) bridge abutments, was constructed as part of a new interchange on I-65 in Whitestown, Indiana. The east and west MSE abutment walls consisted of precast concrete facing panels, ribbed steel strips, and coarse-grained backfill soil. A section near the middle of the ...
  • Monitoring of a SteelReinforced MSE Abutment Wall and Evaluation of its Bearing Capacity Based on the CPT and DCPT Brief
    Monitoring of a Steel-Reinforced MSE Abutment Wall and Evaluation of its Bearing Capacity Based on the CPT and DCPT [Brief]
    Prezzi, Monica ;
    Salgado, Rodrigo
    2025-01-01 | PDF
    A two-span bridge, supported by steel H-piles and mechanically stabilized earth (MSE) bridge abutments, was constructed as part of a new interchange on I-65 in Whitestown, Indiana. The east and west MSE abutment walls consisted of precast concrete facing panels, ribbed steel strips, and coarse-grained backfill soil. A section near the middle of the ...
  • Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer FWD and International Roughness Index IRI Brief
    Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer (FWD) and International Roughness Index (IRI) [Brief]
    Nantung, Tommy ;
    Cho, Seong-Hwan
    2025-01-01 | PDF
    The Indiana Department of Transportation (INDOT) utilizes the International Roughness Index (IRI) and Falling Weight Deflectometer (FWD) data to prioritize pavement maintenance across interstates, state roads, and U.S. highways. While IRI measures ride quality and FWD assesses structural integrity, their threshold values vary by road type, reflecti ...
  • Rumble Strips Fact or Fiction Brief
    Rumble Strips: Fact or Fiction [Brief]
    Asphalt Materials, Inc  ...
    2025-01-01 | PDF
    Centerline rumble strips (CLRS) significantly reduce severe head-on crashes on two lane roads, although installing CLRS in asphalt pavements may accelerate deterioration of the pavement at the longitudinal construction joint. Recent research has suggested chip sealing new rumble strips as a preventive measure; however, chip sealing immediately foll ...
  • An Innovative Practical Approach to Assessing Bitumen Compatibility as A Means of Material Specification
    An Innovative Practical Approach to Assessing Bitumen Compatibility as A Means of Material Specification
    Dave, Eshan V. ;
    Sias, Jo E
    2025-01-01 | PDF
    Modern asphalt mixtures are usually a combination of various materials from different sources, including reclaimed asphalt pavement (RAP) and recycling agents (RAs), and are used to attain sustainable growth. However, the lack of a well-established method for determining compatibility between various sources and types of virgin binder, aged binder ...
  • Artificial Intelligence and Its Role and Use Within State DOTs Technical Summary
    Artificial Intelligence and Its Role and Use Within State DOTs [Technical Summary]
    Egge, Mark ;
    Rupnow, Tyson
    2025-01-01 | PDF
    The research team planned and executed this project in two phases. The project began with foundational research and a literature review, during which the team compiled a broad catalog of practical AI applications. A practitioner-focused phase followed, drawing out real-world insights related to AI policy and implementation. The research team implem ...
  • Stone Matrix Asphalt SMA Overlay Performance Evaluation Brief
    Stone Matrix Asphalt (SMA) Overlay Performance Evaluation [Brief]
    Lee, Jusang M ;
    Haddock, John E.
    2025-01-01 | PDF
    Stone matrix asphalt (SMA) is a specialized asphalt mixture designed to improve pavement performance by combining a coarse aggregate skeleton with a high-binder content mortar. This innovative design, adopted by the Indiana Department of Transportation (INDOT) in the late 1990s, offers distinct advantages over conventional hot mix asphalt (HMA). Cu ...
  • The Effectiveness of Longitudinal Rumble Strips on Indiana Roads Brief
    The Effectiveness of Longitudinal Rumble Strips on Indiana Roads [Brief]
    Tarko, Andrew P.
    2025-01-01 | PDF
    Rumble strips are designed and deployed to reduce run-off-road and head-on crashes by alerting drivers about near-lane departures. Although they have been widely used, their operational safety effectiveness still needs to be investigated under various operational conditions. Rumble strips may have different widths and be installed on edge, shoulder ...
  • A Study of Suburban Arterial Safety Performance Based on Median Type Brief
    A Study of Suburban Arterial Safety Performance Based on Median Type [Brief]
    Tarko, Andrew P. ;
    Romero, Mario A.
    2025-01-01 | PDF
    Suburban arterial roadways must serve two conflicting road functions: regional mobility and access to the abutting land. The potential for conflicts between traffic passing through and traffic accessing road from the neighboring areas could raise safety concerns. Selecting an adequate cross-section is among important decisions that road designers a ...
  • Regional Rollout of the Super Air Meter SAM and Surface Resistivity SR for Performance Engineered Mixture Initiatives
    Regional Rollout of the Super Air Meter (SAM) and Surface Resistivity (SR) for Performance Engineered Mixture Initiatives
    Lacy, Tyler ;
    Mellons, Michael Jason
    2024-12-31 | PDF
    Performance Engineered Mixtures (PEMs) have been the primary focus of concrete mixture research on a national level for years. Tennessee has facilitated several projects over the years to move facets of PEM forward, including Enhancing Freeze-Thaw Resistance of Tennessee Concrete Mixes through Improved Air Void Testing (RES2020-09) and Determining ...
  • Mitigation of End Zone Cracking in Prestressed Concrete Girders
    Mitigation of End Zone Cracking in Prestressed Concrete Girders
    Kim, Yail Jimmy
    2024-12-31 | PDF
    This report presents two major aspects related to the end-zone behavior of prestressed concrete bulb-tee girders: i) laboratory experiments and ii) full-scale finite element modeling. The first part of the report discusses the behavior of anchorage zones, also known as end zones, with discrete rebars and continuous meshes. To examine the implicatio ...
  • Quantification of Field Performance and Nondestructive Testing of Timber Bridges in Colorado
    Quantification of Field Performance and Nondestructive Testing of Timber Bridges in Colorado
    Kim, Yail Jimmy
    2024-12-31 | PDF
    This report presents two major aspects related to evaluating timber bridges with nondestructive testing: i) laboratory experiments and ii) field applications. The first part of the report discusses the degradation processes and resulting outcomes of structural timber, Douglas Fir, that is broadly used for bridge construction. In accordance with the ...
  • 07090 Evaluate the Deployment of High Strength Reinforcing Steel in Texas
    0-7090: Evaluate the Deployment of High Strength Reinforcing Steel in Texas
    Yu, Yongjae ;
    Espanol, Cheska
    2024-12-31 | PDF
    High-strength reinforcing steel has been incorporated into design specifications and permitted under certain provisions of concrete building and bridge design codes, highlighting its growing recognition in construction. The employment of high-strength reinforcing bars offers several potential advantages, including reduced reinforcement quantities, ...
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