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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 281 - 300 of 36054 results
  • Support for the ISTREET Implementing Solutions from Transportation Research and Evaluation of Emerging Technologies Testbed Summary
    Support for the I-STREET™ (Implementing Solutions from Transportation Research and Evaluation of Emerging Technologies) Testbed [Summary]
    Elefteriadou, Lily
    ORCID ICON IMG
    2025-08-01 | PDF
    Built on three pillars of economic development, innovation, and partnerships, I-STREET™ is a real-world transportation testbed developed to enhance transportation safety and mobility. The testbed allows researchers to develop, test, and evaluate emerging technologies in a live environment with real traffic, covering a variety of transportation mode ...
  • Generation2 Fragility Models for California Highway Bridges
    Generation-2 Fragility Models for California Highway Bridges
    Zheng, Qiu ;
    Yang, Walter C.S.
    2025-08-01 | PDF
    This report provides a summary of the framework and methodology underlying the second-generation seismic fragility work (g2F) using selected concrete box-girder bridges in California. It outlines the key components and processes involved in the g2F project designed to improve earthquake risk assessment and mitigation strategies. The report first in ...
  • Evaluation of Corrugated HDPE Pipes Manufactured with Recycled Content
    Evaluation of Corrugated HDPE Pipes Manufactured with Recycled Content
    Pluimer, Michael ;
    Padden, K
    2025-08-01 | PDF
    The objective of the research project was to compare the performance of corrugated high-density polyethylene (HDPE) pipes manufactured with recycled content to those manufactured with only virgin materials. MnDOT currently requires HDPE pipes to be made with 100% virgin materials. However, recent changes to American Association State Highway and Tr ...
  • Verification of Engineered Frameworks for Evaluating the Use of Recycling Agents in Surface Asphalt Mixtures
    Verification of Engineered Frameworks for Evaluating the Use of Recycling Agents in Surface Asphalt Mixtures
    Kuchiishi, Kazuo ;
    Habbouche, Jhony
    2025-08-01 | PDF
    The use of reclaimed asphalt pavement (RAP) in asphalt mixtures has been steadily increasing for years, nationally and internationally, given the economic and associated environmental benefits of using such material. However, using RAP in asphalt mixtures poses some challenges regarding durability and performance that are often associated with the ...
  • A Practical OvenAging Method for Evaluating LongTerm Cracking Performance of Asphalt Mixtures in Virginia
    A Practical Oven-Aging Method for Evaluating Long-Term Cracking Performance of Asphalt Mixtures in Virginia
    Boz, Ilker ;
    Hajj, Elie Y
    2025-08-01 | PDF
    The Virginia Department of Transportation (VDOT) has adopted the balanced mix design (BMD) framework to enhance the durability and service life of its dense-graded asphalt surface mixtures with A and D designations. VDOT’s BMD framework incorporates the indirect tensile cracking test to assess the cracking susceptibility of asphalt mixtures through ...
  • Feasibility Assessment of Alternative Power Options for Roundabout Lighting in Georgia
    Feasibility Assessment of Alternative Power Options for Roundabout Lighting in Georgia
    Yang, Jidong J ;
    Bian, Jiachen
    2025-08-01 | PDF
    This report presents a comprehensive assessment of the technical and economic feasibility of deploying renewable energy - powered lighting systems at roundabouts across Georgia. Driven by the dual goals of enhancing nighttime traffic safety and advancing sustainable infrastructure, the study integrates high-resolution meteorological data, renewable ...
  • Validating Travel Time Delay Quantification and Measurement Methods for Vermont Work Zones
    Validating Travel Time Delay Quantification and Measurement Methods for Vermont Work Zones
    Sullivan, Jim ;
    Sentoff, Karen
    2025-08-01 | PDF
    Although the Vermont Standard Specifications for Construction identify an acceptable delay in work zones of less than 10 minutes per operation and less than 15 minutes cumulatively for a project maintaining one-way traffic, it is recognized that these thresholds have been set without consideration for context, procedures for measuring delay, or met ...
  • Roundabout Construction Using Precast Concrete in Virginia
    Roundabout Construction Using Precast Concrete in Virginia
    Hossain, M. Shabbir ;
    Ozyildirim, H Celik
    2025-08-01 | PDF
    Roundabouts are a special type of intersection that ensures continuous vehicle movement while maintaining slow and safe speeds. Many state departments of transportation are converting existing intersections into roundabouts, but roundabout construction can create significant traffic closures and disruptions. Thus, accelerated construction can be ve ...
  • Development of an Analytical Tool for Work Zone Performance
    Development of an Analytical Tool for Work Zone Performance
    Basulto-Elias, Guillermo ;
    Knickerbocker, Skylar
    2025-08-01 | PDF
    Highway work zones are vital for infrastructure maintenance but often disrupt traffic flow, affecting safety and efficiency. While traditional evaluation methods—such as delay, queue length, and crash data—offer insights, they lack comprehensiveness. Despite improved data collection technologies, agencies struggle to interpret and apply large volum ...
  • Alternative Conditioning Method to Calculate Formation Factor for Wisconsin Concrete Pavement
    Alternative Conditioning Method to Calculate Formation Factor for Wisconsin Concrete Pavement
    Tanesi, Jussara
    2025-08-01 | PDF
    Formation factor has been identified as one of the main properties related to concrete transport properties. Conditioning specimens in solution, such as the default conditioning in ASTM C1876 has been proposed as a means to obtain the formation factor. However, this conditioning has been criticized for several reasons. This project investigates the ...
  • Development of Tennessee UHPC for Bridge Applications
    Development of Tennessee UHPC for Bridge Applications
    Mohr, Benjamin J ;
    Maleque, Md Saeid Ebna
    2025-07-31 | PDF
    Ultra-high performance concrete (UHPC) is known for its exceptionally high mechanical properties and enhanced durability performance. In Accelerated Bridge Construction (ABC), UHPC can be used for precast structural members as well as for bridge repairs, retrofitting and overlay construction. Densely compacted UHPC has a compressive strength of mor ...
  • Guidelines for Implementing Carbon Capture Utilization and Storage CCUS Technologies on TxDOT Projects
    Guidelines for Implementing Carbon Capture, Utilization and Storage (CCUS) Technologies on TxDOT Projects
    Schwerdt, Tom ;
    Rausch, Christopher
    2025-07-31 | PDF
    This report provides guidance to the Texas Department of Transportation (TxDOT) on the potential implementation of Carbon Capture, Utilization, and Storage (CCUS) technologies in transportation infrastructure projects. It synthesizes recent developments in CCUS funding, policy, and technical applications, with the understanding that many of these d ...
  • Wildlife Crossing Hotspot Analyses for Major Highways in Wisconsin USA
    Wildlife Crossing Hotspot Analyses for Major Highways in Wisconsin, USA
    Huijser, Marcel P. ;
    Bell, Matthew A.
    2025-07-31 | PDF
    In this report we explore where and how to enhance road safety in Wisconsin through reducing collisions with large wild mammals on state-maintained routes, while also ensuring safe crossing opportunities for wildlife. We identified and prioritized road sections in Wisconsin along state-maintained routes that have a relatively high concentration of ...
  • The Service and Ultimate Behavior of BenttoColumn Joints in TxDOT Substructures Project Summary
    The Service and Ultimate Behavior of Bent-to-Column Joints in TxDOT Substructures [Project Summary]
    Bayrak, Oguzhan ;
    Wang, Hwa-Ching
    2025-07-31 | PDF
    The researchers employed a multi-phase approach beginning with analytical modeling of typical TxDOT multi-column bents. Using plastic collapse mechanism analysis, they determined the flexural strength required to withstand the AASHTO-specified 600-kip vehicular collision load. This analysis established that while a ductile flexural failure in the c ...
  • Investing in Engineering Talent
    Investing in Engineering Talent
    Singh, Romila ;
    Qin, Xiao
    2025-07-31 | PDF
    This research effort accomplished the objectives of this study by conducting a review of the transportation and engineering workforce literature, survey analysis of hiring, retention, and attitudinal data (for both current employees and graduating college seniors), evaluation of knowledge management, and transfer of knowledge practices. Based on an ...
  • Artificial Intelligence in Transportation
    Artificial Intelligence in Transportation
    Chen, Sikai ;
    Li, Pei
    2025-07-31 | PDF
    This research provides a strategic assessment of how Artificial Intelligence (AI) can be effectively integrated into the operations of the Wisconsin Department of Transportation (WisDOT). The purpose of the research is to identify key opportunities, challenges, and implementation pathways for AI across six major transportation domains: asset manage ...
  • Enhancement of AASHTOWare Bridge Management for Floridas Bridge Inspection and Asset Management
    Enhancement of AASHTOWare Bridge Management for Florida’s Bridge Inspection and Asset Management
    Sobanjo, John O. ;
    Thompson, Paul D.
    2025-07-28 | PDF
    Following its adoption of the new AASHTO Bridge Element Inspection Manual, the Florida Department of Transportation (FDOT) has been collecting bridge element condition data in order to use the AASHTO’s Bridge Management (BrM) software. Now, to aid the Department in satisfying the various federal requirements and prepare for anticipated changes at t ...
  • Development of Incident Management Performance Measures Database and Supporting Training Material
    Development of Incident Management Performance Measures Database and Supporting Training Material
    Overall, Myles W. ;
    Mukai, Justin
    2025-07-28 | PDF
    Secondary crashes resulting from traffic queues are a significant national safety concern. Traffic Incident Management (TIM), which involves coordinated multi-agency response to roadway incidents, is widely recognized as an effective approach to mitigating these crashes. This study aimed to develop a library of after-action case studies to support ...
  • Optimizing Work Zone Conditions to Maximize Safety and Mobility
    Optimizing Work Zone Conditions to Maximize Safety and Mobility
    Kay, Jonathan J. ;
    Gates, Timothy J.
    2025-07-25 | PDF
    Despite the fact that highway work zones represent a required element of maintaining and improving the transportation network, the resulting changes in traffic patterns, narrowed right-of-way, and other construction activities can lead to an increased risk for traffic crashes and related injuries or fatalities. This research sought to identify the ...
  • Practical Implementation of Superabsorbent Polymers SAP for Internally Cured Concrete
    Practical Implementation of Superabsorbent Polymers (SAP) for Internally Cured Concrete
    Ajuonuma, Chibueze ;
    Tokpatayeva, Raikhan
    2025-07-17 | PDF
    Laboratory investigations and results from a year-long field trial demonstrated that plain Type IL cement and slag cement concrete that was internally cured by superabsorbent polymer (SAP) has increased strength and durability compared to SAP-free mixtures, mixtures containing colloidal nanosilica, and mixtures that were externally cured with a sur ...
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