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rosaP Repository & Open Science Access Portal

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 81 - 100 of 36368 results
  • Verification and Calibration of Microscopic Traffic Simulation Using NDS and Video Data for Alternative Intersections and Freeway Merge and Diverge Areas
    Verification and Calibration of Microscopic Traffic Simulation Using NDS and Video Data for Alternative Intersections and Freeway Merge and Diverge Areas
    Zhou, Huaguo ;
    Li, Tonghui
    2026-03-01 | PDF
    Traffic microsimulation enables practitioners to model the movement and interactions of individual vehicles, providing a level of detail not achievable with macroscopic or deterministic approaches. Microsimulation replicates vehicle-to-vehicle and driver-to-driver interactions under a wide range of traffic and geometric conditions. This makes it es ...
  • Evaluation of Backfill Aggregate Properties
    Evaluation of Backfill Aggregate Properties
    Alshibli, Khalid A. ;
    Elkenawi, Mohamed
    2026-03-01 | PDF
    Open-graded granular backfill materials are widely used as retaining wall backfill due to their high shear strength, high permeability, ease to handle, and compaction characteristics. However, the current Tennessee Department of Transportation (TDOT) provisions assume a conservative angle of internal friction for backfill materials. The objective o ...
  • Resilient Modulus of CoarseGrained Subgrade Soils for Pavement Design
    Resilient Modulus of Coarse-Grained Subgrade Soils for Pavement Design
    Hossain, M. Shabbir ;
    Nair, Harikrishnan
    2026-03-01 | PDF
    In 2018, the Virginia Department of Transportation (VDOT) implemented the American Association of State Highway and Transportation Officials’ (AASHTO) AASHTOWare-ME version 2.2.6 as the pavement design methodology for new, reconstruction, and lane-widening projects, including interstate, primary, and secondary routes with annual average daily traff ...
  • Feasibility of Using Recycled Waste Plastic in Concrete Pavements in Nebraska
    Feasibility of Using Recycled Waste Plastic in Concrete Pavements in Nebraska
    Hajahja, Amasi ;
    Teixeira, Jamilla E. S. L.
    2026-03-01 | PDF
    Waste plastic (WP) is a growing environmental concern due to its non-biodegradable nature, large-scale production, and harmful impact on natural resources. With nearly 75% of WP in the U.S. ending up in landfills, effective recycling strategies are urgently needed. In parallel, the limited availability of natural aggregates highlights the need for ...
  • Quality Manual for Steel Bridge Fabrication
    Quality Manual for Steel Bridge Fabrication
    Sherman, Ryan J. ;
    Stewart, Lauren K.
    2026-03-01 | PDF
    The American Association of State Highway and Transportation Officials (AASHTO) and the American Welding Society (AWS) provide extensive guidance documents that govern the welding of steel bridge members; however, none of the documents provide guidance regarding the number of times a welding nonconformance can be repaired without penalty or rejecti ...
  • Development of Pipe Pile to Bent Cap Connection for ALDOT Bridges
    Development of Pipe Pile to Bent Cap Connection for ALDOT Bridges
    Isbiliroglu, Levent ;
    Calderon, Maria Emilia Clavijo
    2026-03-01 | PDF
    Steel pipe piles are a promising alternative to traditional H-piles and drilled shafts for ALDOT bridge substructures because they can achieve high force and moment capacity and enable more efficient construction. However, current guidance on steel pipe pile–to–reinforced concrete bent cap connections is limited, and practices among state DOTs vary ...
  • Balanced Mix Designa 1Year Reality Check on Quality Control Testing and State DOT Adoption
    Balanced Mix Design—a 1-Year Reality Check on Quality Control Testing and State DOT Adoption
    Huang, Kai ;
    Huang, Baoshan
    2026-03-01 | PDF
    Balanced Mix Design (BMD) represents a major advancement in asphalt pavement engineering. As a performance-driven framework, BMD integrates mix design, structural design, quality assurance/quality control (QA/QC), and performance-related specifications (PRS) to promote durable and sustainable pavements and innovations. This synthesis documents the ...
  • Low and Intermediate Temperature Evaluation of Asphalt Binders Through Dynamic Shear Rheometer
    Low and Intermediate Temperature Evaluation of Asphalt Binders Through Dynamic Shear Rheometer
    Salari, Saman ;
    Cooper, Samuel B.
    2026-03-01 | PDF
    The low-temperature properties of asphalt binder play a critical role in the behavior and performance of flexible pavements. Since the 1990s, the Bending Beam Rheometer (BBR) has been the standard instrument for characterizing these properties. However, BBR testing requires time-consuming sample preparation and extensive equipment maintenance. Desp ...
  • Artificial Intelligence for Pavement Condition Assessment From 2D3D Surface Images
    Artificial Intelligence for Pavement Condition Assessment From 2D/3D Surface Images
    Wang, Feng ;
    Gong, Haitao
    2026-03-01 | PDF
    The development of a national standard data format for two-dimensional/three-dimensional (2D/3D) pavement surface images and Artificial Intelligence (AI) Machine Learning (ML) in Computer Vision adopted by AASHTO and embraced by state DOTs has provided TxDOT the opportunity to develop new methods for automated pavement condition assessment. This re ...
  • Skew Detection System Replacement on Vertical Lift Bridges Phase III Project Capsule
    Skew Detection System Replacement on Vertical Lift Bridges (Phase III) [Project Capsule]
    Rees, Gareth
    2026-03-01 | PDF
    The objective of this study is to further improve and refine the recommended preferred alternative skew monitoring and detection technologies (inclinometer and encoder systems only), integrating them into the existing control system and proving their operability and long-term reliability at the Ellenders Ferry Vertical Lift Bridge.
  • Finite Element Method FEM Matrix Study for Rapid Travel Profiler CurlWarp Correlations
    Finite Element Method (FEM) Matrix Study for Rapid Travel Profiler Curl/Warp Correlations
    Haider, Syed Waqar ;
    Ahmed, Hanan
    2026-02-28 | PDF
    Temperature-induced curling and moisture-driven warping continually reshape jointed concrete pavements (JCP), altering wheel-path profiles and affecting the International Roughness Index (IRI). This report presents an integrated framework combining finite element method (FEM) analyses, artificial neural networks (ANNs), and IRI modeling to isolate ...
  • Enhance Bridge Image Attribution Through Automated Post Image Processing
    Enhance Bridge Image Attribution Through Automated Post Image Processing
    Attanayake, Upul ;
    Battu, Naveen
    2026-02-28 | PDF
    Highway agencies and consultants capture thousands of images during biennial, scoping, and request for action (RFA) inspections. Most of these files are stored with limited descriptions or inconsistent naming formats. As a result, a rich data source is underutilized. Understanding the value of this rich data source for asset management, MDOT initia ...
  • Freeway and Arterial Performance Analysis With HighResolution Vehicle Trajectory Data
    Freeway and Arterial Performance Analysis With High-Resolution Vehicle Trajectory Data
    Tian, Zong ;
    Wang, Aobo
    2026-02-28 | PDF
    This research investigates applying high-resolution vehicle trajectory data, derived from vehicle telematics, to facilitate freeway and arterial performance analysis in Nevada. Leveraging vehicle trajectory datasets crowd sourced through original equipment manufacturer (OEM) telematics, the research team conducted a comprehensive synthesis of commo ...
  • North Lombard Street Multimodal Safety Project BeforeAfter Evaluation
    North Lombard Street Multimodal Safety Project Before-After Evaluation
    Kothuri, Sirisha ;
    Anderson, Jason C.
    2026-02-01 | PDF
    This report analyzes and summarizes the changes in conflicts, user volumes, speed, travel time, and vehicle throughput before and after a multimodal safety project on N Lombard St. Results show that changes in each metric were observed in the before and after conditions. The number of persons using crosswalks decreased between 2017 and 2019 and inc ...
  • AlkaliSilica Reaction ASR Mitigation in HighAlkali Content Cements
    Alkali-Silica Reaction (ASR) Mitigation in High-Alkali Content Cements
    Behravan, Amir ;
    Arce, Gabriel A
    2026-02-01 | PDF
    This study presents a comprehensive evaluation of alkali-silica reaction (ASR) in concrete mixtures, focusing on the performance-based specifications and the critical role of supplementary cementitious materials (SCMs) in mitigation. A modified version of American Association of State Highway and Transportation Officials (AASHTO) T380 was developed ...
  • Quantifying Sustainable Pavements in VirginiaFHWA Climate Challenge Study
    Quantifying Sustainable Pavements in Virginia—FHWA Climate Challenge Study
    Amarh, Eugene A. ;
    Katicha, Samer W.
    2026-02-01 | PDF
    This study supports Virginia’s efforts to participate in the Federal Highway Administration’s Climate Challenge Program. The research team developed and applied OpenLCA models to evaluate the effects of key pavement treatments, including asphalt overlays, balanced mix designs, cold in-place recycling, full-depth reclamation, and Portland cement con ...
  • Evaluation of Digital Alert Systems Associated With Emergency Response Vehicles and Compliance With Move Over Law
    Evaluation of Digital Alert Systems Associated With Emergency Response Vehicles and Compliance With Move Over Law
    Talebpour, Alireza ;
    Liu, Pengyuan
    2026-02-01 | PDF
    The presence of stationary emergency vehicles on high-speed roadways poses heightened safety risks, and driver compliance with Move Over laws remains inconsistent nationwide. In recent years, digital alert systems, integrated into widely used navigation applications and in-vehicle platforms, have emerged as a potential countermeasure to improve dri ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol I Agency Survey and Preliminary Numerical Modeling of Skewed Steel IGirder Bridges for Field Instrumentation
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. I): Agency Survey and Preliminary Numerical Modeling of Skewed Steel I-Girder Bridges for Field Instrumentation
    Zhou, Siang ;
    Dorado, Ricardo
    2026-02-01 | PDF
    Highly skewed steel I-girder bridges are used commonly across the US, especially in congested areas, despite complications in their analysis, design, and construction. Systematic investigation of skewed steel I-girder superstructure response, load distribution, and deformation through field monitoring and numerical simulation is needed, including a ...
  • Development of Design Recommendations for Noncontact Hooked Bar Lap Splices for Large Reinforcing Bars
    Development of Design Recommendations for Noncontact Hooked Bar Lap Splices for Large Reinforcing Bars
    Coleman, Zachary W ;
    Brown, Mason
    2026-02-01 | PDF
    On wide bridges, precast concrete pier caps are often constructed in multiple segments and connected on site because of transportation or construction limitations. When these segments are connected through closure joints, contractors use lap splices of straight reinforcing bars. However, the splice lengths of large (e.g., No. 11) straight bars must ...
  • Implementing the Safe System Approach for Speed Management in Utah
    Implementing the Safe System Approach for Speed Management in Utah
    Schultz, Grant G. ;
    Tripp, Kezia I.
    2026-02-01 | PDF
    Speed management is central to reducing fatal and serious injury crashes. The Safe System Approach, an emerging roadway safety paradigm in the United States, recognizes human error and vulnerability and focuses on minimizing crash severity through coordinated policy, design, and operational strategies. This research examines how Safe System Approac ...
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