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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 601 - 620 of 36841 results
  • 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 ...
  • 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 ...
  • Placement of ThreeQuarter Inch Dowels in MnROAD Concrete Test Cell 2437 and Deployment in Interstate Highway 35 in Hinckley Minnesota
    Placement of Three-Quarter Inch Dowels in MnROAD Concrete Test Cell 2437 and Deployment in Interstate Highway 35 in Hinckley Minnesota
    Izevbekhai, Bernard Igbafen
    2025-08-01 | PDF
    This research report examines the dowel placement initial testing and initial test results of the ¾ dowels at the MnROAD facility and in the test sections on Interstate 35 at Hinckley. A 36 ft by 12 ft test section was constructed on November 22, 2024, when the ambient temperature was approximately 35°F. The test cell MnROAD low volume road cell 24 ...
  • Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve MR Analysis and Project Development
    Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development
    Shrestha, K. Joseph ;
    Uddin, Mohammad Moin
    2025-08-01 | PDF
    Accurate preliminary cost estimates for resurfacing projects are essential to conduct a reliable Maintenance & Rehabilitation (M&R) analysis, prioritize projects, and optimize the use of available budget. However, TDOT is currently using an outdated cost per lane mile data for such analysis, and hence the results of such analysis can be less reliab ...
  • Pavement Design Performance of Base versus Subbase
    Pavement Design: Performance of Base versus Subbase
    Tutumluer, Erol ;
    Koh, Yongsung
    2025-08-01 | PDF
    The limited availability of high-quality aggregates and rising transportation costs present ongoing challenges for pavement construction and maintenance in Minnesota. To address this, local agencies are increasingly exploring the use of lower-quality, locally available materials in pavement foundation layers. This study evaluates the performance an ...
  • A Feasibility Study of Road CulvertBridge Deck Deicing Using Geothermal Energy
    A Feasibility Study of Road Culvert/Bridge Deck Deicing Using Geothermal Energy
    Khosravi, Mohammad ;
    Turner, Ethan
    2025-08-01 | PDF
    Montana's severe winters challenge bridge infrastructure with snow, ice, and concrete deterioration. Traditional deicing methods are often insufficient, harmful, and costly. This research explored using shallow geothermal energy for sustainable bridge deck deicing. Through lab tests, simulations, and machine learning, the system showed it could kee ...
  • 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 ...
  • 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 ...
  • Implementing an Advanced Friction Testing Program for Seamless Coverage of INDOT System
    Implementing an Advanced Friction Testing Program for Seamless Coverage of INDOT System
    Tao, Chengcheng ;
    Lin, Yizhou
    2025-07-31 | PDF
    The interaction between tires and the road surface is crucial for maintaining vehicle stability and safety. The frictional forces at the tire-road interface, along with the coefficient of friction, affect vehicle dynamics, influencing transportation safety. Rapid advancements in transportation technology, infrastructure demands, and safety regulati ...
  • 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 ...
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