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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 261 - 280 of 36569 results
  • Lidar for Geotechnical Applications Technical Summary
    Lidar for Geotechnical Applications [Technical Summary]
    Gautreau, Gavin P.
    2026-01-01 | PDF
    This research focused on the utilization of Light Detection and Ranging (LiDAR) technology within the Louisiana Department of Transportation and Development (DOTD) for various geotechnical applications. The study addresses key aspects, including site investigation and reconnaissance for drilling operations, Geotechnical Asset Management inventory d ...
  • WebBased Tool to Advance Geotechnical Data Interchange and ReliabilityBased Site Characterization Technical Summary
    Web-Based Tool to Advance Geotechnical Data Interchange and Reliability-Based Site Characterization [Technical Summary]
    Gautreau, Gavin P.
    2026-01-01 | PDF
    This project expanded upon a prototype interface initially developed for large, data-rich projects and produced a functional tool that DOTD can use on any digital project within the Department. The new tool, named GDX-plorer, builds upon DOTD’s ongoing efforts to modernize geotechnical data management and support the adoption of advanced techniques ...
  • What Makes a Good Transportation Demand Management Calculator Research Brief
    What Makes a Good Transportation Demand Management Calculator? [Research Brief]
    Scheib, Walter ;
    Kilpatrick, Ian
    2026-01-01 | PDF
    This study identified seventeen TDM calculators in use around the country. These calculators were evaluated on their interface, format, directions, methodology, validity, and versatility. The study then conducted two rounds of interviews. The first round was with some of the jurisdictions currently using these calculators to understand what went in ...
  • Enhanced Traffic Pattern Knowledge Abstraction and Presentation From 511 Database
    Enhanced Traffic Pattern Knowledge Abstraction and Presentation From 511 Database
    Ding, Jiannan ;
    Koshy, Liya
    2025-12-31 | PDF
    The explosive growth in the volume, variety, and velocity of transportation data has placed considerable strain on traditional data infrastructures employed by state departments of transportation (state DOTs). Existing traffic information systems are constrained by fragmented data streams, limited historical archiving, and inadequate interoperabili ...
  • Operational Baseline and Structural Health Monitoring for the 2nd Avenue Network Arch Bridge
    Operational Baseline and Structural Health Monitoring for the 2nd Avenue Network Arch Bridge
    Attanayake, Upul ;
    Amunugama, Harsha
    2025-12-31 | PDF
    A unique network tied-arch bridge with free-standing arches was designed to carry 2nd Avenue traffic over Interstate (I-94) in Detroit, Michigan. This 245-ft-long, 96.5-ft-wide bridge, skewed at 18 degrees, is the first skewed, unbraced network arch bridge constructed in the United States. The superstructure frame was erected off-site at a bridge s ...
  • A Synthesis Study to Identify and Make Recommendations on the Appropriate Nondestructive Testing Tools for Bridge Beam Ends Piers and Abutments
    A Synthesis Study to Identify and Make Recommendations on the Appropriate Nondestructive Testing Tools for Bridge Beam Ends, Piers, and Abutments
    Panjehpour, Pan ;
    Baah, Prince
    2025-12-30 | PDF
    The aim of this research was to identify suitable NDT methods for bridge components by evaluating their advantages, disadvantages, and limitations. The research objectives are: (1) to identify suitable NDT tools and techniques for condition evaluation of bridge beam-ends, abutments, and piers based on their advantages and disadvantages, (2) to iden ...
  • Safety Performance of Centerline Raised Pavement Markers
    Safety Performance of Centerline Raised Pavement Markers
    Forero, Lucas Florez ;
    Bandaru, Vamsi Krishna
    2025-12-30 | PDF
    Centerline raised pavement markers (RPM) have emerged as a justifiable rural road safety countermeasure for preventing run-off-road (ROR) and opposite-direction crashes. These devices supplement lane markings, enhance positional guidance, alert drivers to changes in roadway geometry, and reduce encroachment. This research evaluated the safety effec ...
  • Improved Detailing in Steel Bridges to Prevent ConstraintInduced Fracture
    Improved Detailing in Steel Bridges to Prevent Constraint-Induced Fracture
    Bennett, Caroline ;
    Collins, William N.
    2025-12-19 | PDF
    This report describes an investigation focused on characterizing the phenomenon of constraint-induced fracture (CIF) in steel bridges, specifically considering three classes of details which prior research has not adequately addressed: thick bearing stiffeners, connection plates, and orthogonal stiffeners with varying constraint-relief gap dimensio ...
  • South Dakota Blowing Snow Mitigation Strategies Prioritization and Implementation
    South Dakota Blowing Snow Mitigation Strategies, Prioritization, and Implementation
    Villwock-Witte, Natalie ;
    Fay, Laura
    2025-12-12 | PDF
    Blowing and drifting snow on the roadway can cause major challenges for safety and mobility, as well as increased maintenance needs. This challenge can be particularly problematic in more rural locations where the distance for a snowplow to travel to treat an impacted roadway can be longer. In addition, if a road were to shut down due to weather im ...
  • Resilient Modulus Improvements to Bases and Subgrades from Geosynthetic Reinforcement
    Resilient Modulus Improvements to Bases and Subgrades from Geosynthetic Reinforcement
    Husain, Syed Faizan ;
    Qamhia, Issam I. A.
    2025-12-09 | PDF
    This study investigated the benefits of geogrid stabilization in unbound granular layers and developed a framework to incorporate those benefits into mechanistic–empirical (ME) pavement design. The purpose was to address limitations in current design practices that treat geosynthetic stabilized and non-stabilized layer equivalently, despite evidenc ...
  • Effective Shoulder Width on Rural Highway System Related to Roadway Departure Crashes
    Effective Shoulder Width on Rural Highway System Related to Roadway Departure Crashes
    Barahona, Mario ;
    Bandaru, Vamsi Krishna
    2025-12-09 | PDF
    Roadway design plays a crucial role in traffic safety, particularly on rural roads. This research investigates the safety effectiveness of shoulder width on Indiana’s rural two-lane highways, and to use this understanding to provide a basis for more effective shoulder improvement programs. Although previous studies have established the benefits of ...
  • Designing and Evaluating Infiltration Swales for Retaining and Infiltrating Roadway Stormwater Runoff
    Designing and Evaluating Infiltration Swales for Retaining and Infiltrating Roadway Stormwater Runoff
    Austin, Parker J. ;
    Florez, Diego A. Ramirez
    2025-12-08 | PDF
    The Alabama Department of Transportation (ALDOT) employs infiltration swales, linear vegetated channels with engineered soil media, as a green infrastructure stormwater control measure along roadsides to reduce runoff discharge. This study evaluated the performance of infiltration swales and their media through laboratory experiments, field testing ...
  • Enhancing MDOTs Pavement Management Tool PMT Inputs Through DataDriven Analysis
    Enhancing MDOT’s Pavement Management Tool (PMT) Inputs Through Data-Driven Analysis
    Castillo, Daniel ;
    Kutay, M. Emin
    2025-12-05 | PDF
    This project was undertaken to support the Michigan Department of Transportation’s (MDOT) implementation of a new Pavement Management Tool (PMT), a decision-support system designed to optimize pavement project selection. The goal was to develop data-driven inputs for the PMT using MDOT’s extensive historical pavement condition and maintenance data, ...
  • Evaluation of MDOTs Methodologies for Both Quantifying Pavement Distress and Modeling Pavement Performance for LifeCycle Cost and Remaining Service Life Estimation Purposes
    Evaluation of MDOT’s Methodologies for Both Quantifying Pavement Distress and Modeling Pavement Performance for Life-Cycle Cost and Remaining Service Life Estimation Purposes
    Kutay, M. Emin ;
    Hasnat, Mumtahin
    2025-12-05 | PDF
    MDOT has been using the Distress Index (DI) since the inception of its pavement management system (PMS) in the early 1990s. DI was developed to help MDOT engineers decide, allocate budgets, and prioritize future maintenance or reconstruction activities. However, the raw data requirements for the DI are complicated (and somewhat unique compared to t ...
  • Further Refinement and Integrated Platform for INDOT Traffic Management and Safety Toolset
    Further Refinement and Integrated Platform for INDOT Traffic Management and Safety Toolset
    Chien, Stanley ;
    Hu, Shu
    2025-12-05 | PDF
    The project aims to further refine the previously developed Anomaly Detection and Weaving Analysis programs and create a unified, Web-based user interface for users to access TASI-developed software tools conveniently. 1. The INDOT Application Suite has been successfully developed for centralizing the digital platform developed by Purdue University ...
  • Improving Longrange Planning Models for Feasibility Analysis of Mileagebased User Fees as an Alternative Revenue Stream
    Improving Long-range Planning Models for Feasibility Analysis of Mileage-based User Fees as an Alternative Revenue Stream
    Pandey, Venktesh ;
    Hasnine, Sami
    2025-12-05 | PDF
    Declining motor fuel tax revenues driven by increasing fuel efficiency and zero-emission vehicle adoption have prompted North Carolina to evaluate Mileage-Based User Fees (MBUF) as a sustainable funding alternative. This study combines literature review, survey-based behavioral modeling, and statewide network analysis to assess the feasibility and ...
  • Comparing Resistivity and Conductivity in Metal Culverts
    Comparing Resistivity and Conductivity in Metal Culverts
    Collison, Jake
    2025-12-04 | PDF
    Before installing an underground metal culvert, certain soil characteristics need to be measured to calculate its expected service life. The service life of an underground culvert is a function of the expected amount of corrosion based on the soil, the type of culvert used, and water conditions. The New Mexico Department of Transportation (NMDOT) u ...
  • Determination of Recovery Bridge Corridors by Comparing Post EQ Network
    Determination of Recovery Bridge Corridors by Comparing Post EQ Network
    Soga, Kenichi ;
    Wang, Ziqi
    2025-12-02 | PDF
    This study focuses on Caltrans District 4 in the San Francisco Bay Area (Alameda, Contra Costa, Marin, Napa, San Francisco, Santa Clara, San Mateo, Solano, and Sonoma). It proposes a framework to identify and prioritize critical bridge corridors that enable access to emergency facilities, including hospitals, fire stations, police stations, Caltran ...
  • Assessing Rejuvenators That Extend Pavement Service Life Research Summary
    Assessing Rejuvenators That Extend Pavement Service Life [Research Summary]
    Kutay, Muhammed Emin ;
    Neumann, JinYeene
    2025-12-01 | PDF
    This Research Summary is part of Report 2025-39, "Evaluation of Proprietary Rejuvenators."
  • Kansas Department of Transportation 2025 Passing Lane Guidance Technical Summary
    Kansas Department of Transportation 2025 Passing Lane Guidance [Technical Summary]
    Fitzsimmons, Eric J. ;
    Harwood, Douglas
    2025-12-01 | PDF
    This report provides comprehensive guidance for planning, locating, designing, and evaluating passing lanes on Kansas rural two-lane highways. It describes the role of passing in improving mobility by reducing platooning, lowering percent time spent following, and increasing travel speeds. Multiple passing lane configurations are outlined, with gui ...
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