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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 21 - 40 of 36841 results
  • Statewide NonMotorized Traffic Monitoring Study
    Statewide Non-Motorized Traffic Monitoring Study
    Bian, Ruijie "Rebecca" ;
    Tolford, Tara
    2026-08-01 | PDF
    The growing emphasis on creating a multimodal transportation system in the U.S. requires high-quality multimodal traffic data for planning success. This research investigated strategies for integrating non-motorized (i.e., bicyclist and pedestrian) traffic monitoring into routine motorized traffic monitoring practices in Louisiana. Key objectives i ...
  • Refined Design Methods for Leanon Bracing
    Refined Design Methods for Lean-on Bracing
    Bjelland, Aiden ;
    Gasser, Claire
    2026-08-01 | PDF
    Cross frames are structural elements that are critical for the stability of steel bridges during erection and construction and also play an important role for completed bridges. Historically, the brace locations have been regions of fatigue concerns. In addition, the braces require significant handling and processing during fabrication and represen ...
  • Iowa Statewide Transportation Innovation Council STIC Incentive Program HyperFlow Pilot for Signal Performance Assessment City of Dubuque Iowa
    Iowa Statewide Transportation Innovation Council (STIC) Incentive Program HyperFlow Pilot for Signal Performance Assessment - City of Dubuque, Iowa
    Mahulkar, Vishal ;
    Sharma, Anuj
    2026-08-01 | PDF
    This project piloted ETALYC's HyperFlow platform for system-wide traffic signal performance assessment in the City of Dubuque, Iowa. HyperFlow is a cloud-based software product that fuses crowdsourced connected-vehicle / probe trajectory data with analytics workflows to evaluate intersection and corridor operations without installing new roadside s ...
  • Balanced Mix Design Evaluation of Cracking Tests for Airfield Pavements
    Balanced Mix Design: Evaluation of Cracking Tests for Airfield Pavements
    Al-Qadi, Imad L. ;
    Bajaj, Akash
    2026-08-01 | PDF
    Performance-based asphalt mixture design is gaining widespread adoption for highway pavements due to limitations of the volumetric approach in addressing potential increases in vehicle torque and evolving material components. Airports face similar challenges, including increasing gear loads and tire pressures. The objective of this research was to ...
  • Prototyping Automated Framework for Asset Extraction and Characterization From Mobile Lidar Data
    Prototyping Automated Framework for Asset Extraction and Characterization From Mobile Lidar Data
    Che, Erzhuo ;
    Kamalou, Sahar
    2026-08-01 | PDF
    To be able to handle the statewide mobile lidar data ODOT collects efficiently, there is a need for a robust workflow with significant automation that can extract many types of features by effectively leveraging various feature extraction tools and algorithms to support applications. In particular, road characterization has been identified as a key ...
    Supporting Files
  • Drilled Shaft Imaging With 2D Ultrasonic Waveform Tomography
    Drilled Shaft Imaging With 2D Ultrasonic Waveform Tomography
    Tran, Khiem ;
    Yang, Bingkun
    2026-08-01 | PDF
    Drilled shafts are widely used as deep foundations for transportation infrastructure; however, construction defects such as soil intrusion, concrete segregation, slurry inclusions, necking, and soft-bottom conditions can compromise structural integrity and long-term performance. Conventional crosshole sonic logging (CSL) provides valuable quality-c ...
  • Evaluation of SaturatesAromaticsResinsAsphaltenes SARA Fractionation of Asphalt Binders in Louisiana
    Evaluation of Saturates/Aromatics/Resins/Asphaltenes (SARA) Fractionation of Asphalt Binders in Louisiana
    Salari, Saman ;
    Akentuna, Moses
    2026-08-01 | PDF
    State and federal agencies face ongoing challenges in the characterization and qualification of diverse paving materials. Although conventional asphalt binder characterization relies on extensive rheological and mixture testing, these methods often leave long-term performance characterization uncertain. Consequently, agencies are exploring faster, ...
  • Pavement Temperature Monitoring and Modeling at ICART
    Pavement Temperature Monitoring and Modeling at ICART
    Hajj, Ramez ;
    Morales, Fernanda Marquez
    2026-08-01 | PDF
    Hot-mix asphalt is a viscoelastic material with properties that depend heavily on temperature and loading frequency. Consequently, precise pavement temperature monitoring is critical for accurate pavement analysis, modulus backcalculation, and prediction of critical pavement responses. Recent Illinois Center for Transportation and Illinois Departme ...
  • Advancements in Profiler Certification
    Advancements in Profiler Certification
    Karamihas, Steven ;
    Borthakur, Abhik
    2026-08-01 | PDF
    Repeatable, accurate, and reproducible measurement of a pavement's longitudinal profile is essential to supporting state and federal efforts related to the functional quality of the road system. A key ingredient to ensuring repeatable, accurate, and reproducible profile measurements is a robust profiler certification program that is based on AASHTO ...
  • The Effects of Surface Condition and LongTerm Environmental Exposure on the Bond Between CFRP and Steel
    The Effects of Surface Condition and Long-Term Environmental Exposure on the Bond Between CFRP and Steel
    Yu-Shan, Abril ;
    Kassner, Bernard L.
    2026-08-01 | PDF
    As the existing steel infrastructure inevitably continues to age and deteriorate, engineers are increasingly looking for innovative and effective methods for repairing and maintaining existing steel bridges, which are susceptible to corrosion damage when exposed to aggressive environments and deicing salts. Conventional methods for repairing steel ...
  • Michigan Hydrologic Calculation Procedures
    Michigan Hydrologic Calculation Procedures
    Watkins, D. ;
    Brooks, C.
    2026-07-31 | PDF
    This report describes analyses and recommended updates to methods for estimating flood discharges in ungaged watersheds. Tasks included updating rainfall frequency and storm distribution data, recalibrating the unit hydrograph model, and evaluating the time of concentration method. GIS-based tools were developed for hydro-enforcement, watershed del ...
  • Portable Driving Simulation Platform for Innovative Intersections
    Portable Driving Simulation Platform for Innovative Intersections
    Jiang, Luyang ;
    Li, Zihao
    2026-07-23 | PDF
    This report presents a portable driving simulation platform developed to improve public understanding and evaluation of innovative intersection designs. Built in Unity, the system integrates real-world roadway data with modular traffic and vehicle simulation to create realistic, interactive driving scenarios. Results show the platform effectively s ...
  • Review of AASHTOWare Pavement ME Design Version 30
    Review of AASHTOWare Pavement ME Design Version 3.0
    Lee, Jusang ;
    Jeon, Jongmyung
    2026-07-16 | PDF
    This study evaluated the differences between AASHTOWare Pavement ME Design (PMED) Version 2.6 and Version 3.0 using representative Indiana pavement structures and traffic conditions. PMED Version 3.0 introduces several major updates, including adoption of the MERRA-2 climate database, revised rigid pavement slab-base interaction models, updated cal ...
  • Which Freeway Corridors in Los Angeles Can Support Regional Bus Service Policy Brief
    Which Freeway Corridors in Los Angeles Can Support Regional Bus Service? [Policy Brief]
    Sanchez, Ivan Emilio III
    2026-07-01 | PDF
    This study highlights a screening-level method for identifying potential sites for new regional bus services. The frame work is intended to help Caltrans District 7 compare freeway segments and identify sites for further technical analysis.
  • Evaluating Bat Use of Culverts in Virginia and Opportunities to Streamline Consultation for VDOT Projects
    Evaluating Bat Use of Culverts in Virginia and Opportunities to Streamline Consultation for VDOT Projects
    Donaldson, Bridget M. ;
    Luu, Jonathan C.
    2026-07-01 | PDF
    Transportation projects in Virginia frequently require coordination with the U.S. Fish and Wildlife Service (USFWS) to address the potential effects on federally listed bat species. Although existing tools provided by USFWS and the Federal Highway Administration offer effective pathways for many projects, individual coordination is still needed to ...
  • Report 27R01 Evaluating Bat Use of Culverts in Virginia and Opportunities to Streamline Consultation for VDOT Projects Research Project Brief
    Report 27-R01: Evaluating Bat Use of Culverts in Virginia and Opportunities to Streamline Consultation for VDOT Projects [Research Project Brief]
    Donaldson, Bridget M. ;
    Luu, Jonathan C.
    2026-07-01 | PDF
    This study evaluated opportunities to improve the efficiency and consistency of bat-related coordination through two complementary components: (1) development of a structured framework to guide a follow-up culvert field study intended to better inform culvert survey requirements and decision-making; and (2) evaluation of broader streamlining opport ...
  • Enhancing Pavement-Encoded Signages for Precise Driving Automation [Supporting Dataset]
    Sakulneya, Apidej ;
    Liu, Pengyuan
    2026-07-01 | JSON
    A field study was developed combining an automated driving system (ADS) vehicle and magnetometer-based sensing system to test the detectability, repeatability, and reliability of pavement encoded electromagnetic (EM) strips placed on the surface of concrete and asphalt pavement. The objective was to define the EM strips' patterns, lateral vehicle p ...
    Dataset Supporting Files
  • Determining Landslide Drain Lifecycle for Development of Maintenance and Operation Manuals
    Determining Landslide Drain Lifecycle for Development of Maintenance and Operation Manuals
    Leshchinsky, Ben A. ;
    Abed, Mahrooz
    2026-07-01 | PDF
    In this project, numerical models are proposed to evaluate the (1) mechanisms and transient drawdown from horizontal drains for a wide range of geometric conditions using simplified design charts, (2) siltation mechanisms and timing for various drain geometries and grain sizes as a means of determining "time until failure" using simplified design c ...
    Supporting Files
  • How Los Angeles Can Improve Its Delivery and Maintenance of Protected Bike Lanes and Why It Should Policy Brief
    How Los Angeles Can Improve Its Delivery and Maintenance of Protected Bike Lanes (and Why It Should) [Policy Brief]
    Wilcox, Micah
    ORCID ICON IMG
    2026-07-01 | PDF
    The study had four main components: A literature review highlighting nine best practices for active transportation infrastructure project management; interviews with seven planners from three American cities with high bikeability rankings, focusing on how these cities have implemented these best practices; interviews with four active transportation ...
  • Use and Worker Perceptions of Wearable Lighted Apparel
    Use and Worker Perceptions of Wearable Lighted Apparel
    Williams, Brian M. ;
    Kassing, Andrew J.
    2026-07-01 | PDF
    In 2023, fatalities that involved workers on foot being struck by a vehicle accounted for 60% of all fatal highway worker injuries (National Work Zone Safety Information Clearinghouse, n.d.). Increasing the visibility of road workers to oncoming drivers may help reduce this crash risk. Wearable lighted apparel has the potential to increase the visi ...
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