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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 1 - 20 of 36710 results
  • Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design Final Report
    Guardrail Height Safety Requirements Given Recent Crash History and Evolution of Vehicle Design: Final Report
    Parr, Scott A. ;
    Morgan, Delaney
    2026-08-01 | PDF
    Over the past several decades, the U.S. vehicle fleet has shifted toward larger, taller, and heavier vehicles, raising questions about whether roadside safety systems remain aligned with real-world vehicle characteristics. This study evaluated the adequacy of the Florida Department of Transportation's current 31-inch guardrail height standard relat ...
  • Transportation Impacts of Berkeley Hills Tunnel Disruption by Earthquakes
    Transportation Impacts of Berkeley Hills Tunnel Disruption by Earthquakes
    Han, Tianyu ;
    Zhao, Bingyu
    2026-08-01 | PDF
    In the San Francisco Bay Area, earthquake damage to a small number of critical transportation facilities can produce regionwide mobility impacts. This report evaluates the Berkeley Hills Tunnel, a key Bay Area Rapid Transit (BART) cross-hills connection, using an integrated model that links tunnel seismic performance to transportation consequences ...
  • 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
  • Quarry ByProduct Fines for Otta Seal Surfacing of Local Roads
    Quarry By-Product Fines for Otta Seal Surfacing of Local Roads
    Mahala, Neeta ;
    Kong, Taeyun
    2026-08-01 | PDF
    This report evaluates through comprehensive laboratory testing the potential of utilizing quarry by-products (QBs) in Otta seal applications as a sustainable and economical alternative to conventional aggregates. An asphalt surface treatment used on low-volume roads, Otta seal consists of a relatively thick application of asphalt binder, covered wi ...
  • 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 ...
  • 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 ...
  • 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, ...
  • 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 ...
  • Developing Guidelines for Context Specific Crosswalk Design
    Developing Guidelines for Context Specific Crosswalk Design
    Raida, Afrida ;
    Robartes, Erin M.
    2026-08-01 | PDF
    Crosswalks can be marked as either transverse or high-visibility crosswalks (HVCs). The Virginia Department of Transportation (VDOT) mandates HVCs at marked crosswalks at all unsignalized crossings, roundabouts, and pedestrian hybrid beacons, except on stop-controlled approaches, as IIM-TE-384.1 describes. At signalized intersections, marking type ...
  • Report R27R03 Developing Guidelines for Context Specific Crosswalk Design Research Project Brief
    Report R27-R03: Developing Guidelines for Context Specific Crosswalk Design [Research Project Brief]
    Raida, Afrida ;
    Robartes, Erin M.
    2026-08-01 | PDF
    Crosswalks can be marked as either transverse or high-visibility crosswalks (HVCs). The Virginia Department of Transportation (VDOT) mandates HVCs at marked crosswalks at all unsignalized crossings, roundabouts, and pedestrian hybrid beacons, except on stop-controlled approaches, as IIM-TE-384.1 describes. At signalized intersections, marking type ...
  • 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 ...
  • Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections
    Developing Guidance on Leading Pedestrian Intervals and Curb Extensions to Improve Pedestrian Safety at Signalized Intersections
    Hurwitz, David ;
    Jashami, Hisham
    2026-08-01 | PDF
    Improving pedestrian safety continues to be critically important to ODOT's mission to provide a safe and reliable multimodal transportation system. This research provides ODOT with refined tools to improve pedestrian safety at signalized intersections by developing enhanced guidance on when and where to implement Leading Pedestrian Intervals (LPI) ...
    Supporting Files
  • Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program
    Before and After Study of Safety Improvement Projects on State Highways Funded Through the Highway Safety Improvement Program
    Hurwitz, David ;
    Jashami, Hisham
    2026-08-01 | PDF
    This study develops a transferable framework for the analysis of three low-cost safety improvement projects installed on state highways in Oregon; specifically Rectangular Rapid Flashing Beacon (RRFB), Shoulder Rumble Strips (SRS), and Two-Way to Four-Way Stop Conversion. A before-after EB study was performed for RRFB and SRS. A cross-sectional ana ...
  • 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 ...
  • Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction
    Determination of Test Methods to Quantify the Effects of Organic and Inorganic Constituents in Silica Sand Used for Construction
    Ferraro, Christopher C. ;
    Riding, Kyle A.
    2026-07-01 | PDF
    Florida-produced fine aggregates are generally of suitable quality, and deleterious effects associated with organic matter are uncommon. However, naturally occurring organic constituents can affect cement hydration and early-age strength development depending on their concentration, composition, and interaction with cementitious phases. The sands e ...
  • Spatial and Temporal Load Distribution in Steel Bridge Superstructures Vol III Investigation of Skew and Abutment Influence on Steel IGirder Bridge Performance Under Live Load and LongTerm Thermal Effects Through Field Data and Parametric Studies
    Spatial and Temporal Load Distribution in Steel Bridge Superstructures (Vol. III): Investigation of Skew and Abutment Influence on Steel I-Girder Bridge Performance Under Live Load and Long-Term Thermal Effects Through Field Data and Parametric Studies
    Dorado, Ricardo ;
    Zhou, Siang
    2026-07-01 | PDF
    Skewed steel I-girder integral abutment bridges (IABs) are increasingly used due to their structural efficiency and elimination of deck joints. Thermally induced behavior of such bridge systems, however, remains insufficiently understood. This report documents the live load and thermal behavior of skewed steel I-girder bridges, which are representa ...
  • Development of a NonDestructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers
    Development of a Non-Destructive Imaging Tool to Identify Deficiencies in External Tendons Containing Flexible Fillers
    Alexander, Christopher L. ;
    Sagüés, Alberto A.
    2026-07-01 | PDF
    The University of South Florida's Corrosion Research Laboratory previously developed a tendon imaging unit (TIU) capable of providing representative cross-section images of external tendons that show strand envelope position and the likelihood of grouting deficiencies. The objective of this work was to adapt the grout-based TIU for application to w ...
  • Understanding Aggressive Driving and Ways to Reduce It Phase 2 Engaging Bystanders and Developing Effective Messages
    Understanding Aggressive Driving and Ways to Reduce It, Phase 2: Engaging Bystanders and Developing Effective Messages
    Hanson, Bridget L. ;
    Green, Kelly
    2026-07-01 | PDF
    Aggressive driving is a prevalent traffic safety concern that contributes to crash risk and undermines traffic safety culture. Building on Phase 1 work that defined aggressive driving and identified promising intervention points, this Phase 2 study examined two complementary strategies to reduce aggressive driving: supporting bystanders (i.e., spou ...
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