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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 121 - 140 of 36841 results
  • Guide on Using Alternative Data Sources for a Texas Speed Zone Study Updated
    Guide on Using Alternative Data Sources for a Texas Speed Zone Study, Updated
    Fitzpatrick, Kay ;
    Kutela, Boniphace
    2026-06-01 | PDF
    Within Texas, the Texas Department of Transportation Procedures for Establishing Speed Zones (TxSZ) and the Texas Manual on Uniform Traffic Control Devices (TxMUTCD) are used for setting speed limits other than statutory speed limits. The TxSZ details how to conduct an engineering study that is needed when investigating the appropriate speed limit ...
  • Crack Width Limit for UHPC Structural Members in Coastal and Marine Environment
    Crack Width Limit for UHPC Structural Members in Coastal and Marine Environment
    Zhang, Qian ;
    Riding, Kyle
    2026-06-01 | PDF
    Ultra-high-performance concrete (UHPC) is increasingly used in transportation infrastructure because of its high strength, dense microstructure, low permeability, fiber-bridged crack control, and self-healing potential. These properties make UHPC suitable for structural members exposed to coastal and marine environments, where chloride-induced corr ...
  • Using Vehicle Probe Data to Evaluate Speed Limits Year 3
    Using Vehicle Probe Data to Evaluate Speed Limits, Year 3
    Fitzpatrick, Kay ;
    Kutela, Boniphace
    2026-06-01 | PDF
    Speed limits are among the most visible and routinely enforced traffic control devices motorists encounter in their everyday driving. Speed limits are set using speed zone studies. This research project investigated how to make speed zone studies and speed zone decisions more effective and efficient. Researchers explored the thresholds for speed zo ...
  • Bond Performance Between Precast UHPC Substrates and FieldCast UHPC Connections
    Bond Performance Between Precast UHPC Substrates and Field-Cast UHPC Connections
    Lau, Kingsley ;
    Permeh, Samanbar
    2026-06-01 | PDF
    Ultra-high performance concrete (UHPC) has been used in different applications and was explored to be used for precast elements; however, there was limited research and guidance on the connection between UHPC elements. General test methods to evaluate interface strength (e.g., direct tension pulloff, shear pushoff) can be used with the Mohr-Coulomb ...
  • A Gap Analysis of Existing Database Management Practices and Ontology Development for UDOT Tier 1 Safety Assets
    A Gap Analysis of Existing Database Management Practices and Ontology Development for UDOT Tier 1 Safety Assets
    Adams, Brig Dean ;
    Esteghamati, Mohsen Zaker
    2026-06-01 | PDF
    This study evaluates transportation asset data management practices within the Utah Department of Transportation (UDOT) and identifies opportunities to improve data governance, integration, and interoperability through ontology-informed enterprise data management principles. Current practices were assessed through stakeholder surveys, asset databas ...
  • Field Evaluation of HighPerformance Cold Mix HPCM Products
    Field Evaluation of High-Performance Cold Mix (HPCM) Products
    Arkansas. Department of Transportation. Materials Division and Planning & Research Division
    2026-06-01 | PDF
    This research project evaluated the field performance of nine High-Performance Cold Mix (HPCM) products from various producers to determine suitability for inclusion on ARDOT's Qualified Products List (QPL). The test section was constructed in September 2024 on Hwy 338 (Sweet Home Cutoff/Dixon Road) in south Little Rock. Nine unique HPCM products, ...
  • Evaluating a TwoStage Roadside Ditch Design to Improve Environmental Performance
    Evaluating a Two-Stage Roadside Ditch Design to Improve Environmental Performance
    Schilling, Keith ;
    Muste, Marian
    2026-06-01 | PDF
    Roadside ditches are integral components of watershed-scale hydrologic processes that are designed to rapidly convey surface runoff from roads to receiving streams. In this project, a two-stage roadside ditch was constructed during expansion of Highway 30 in east-central Iowa. Pre-construction monitoring and development of a preliminary design was ...
  • Development of Alternative Desert Tortoise Crossing Criteria and Designs Final Design Report Final Design Plan Set and Structure List Final Cost Estimate and Final Notes to Specifications
    Development of Alternative Desert Tortoise Crossing Criteria and Designs: Final Design Report, Final Design Plan Set and Structure List, Final Cost Estimate, and Final Notes to Specifications
    Nussbaumer, Matthew ;
    Hidalgo, Keith
    2026-06-01 | PDF
    The primary goal of this project is to improve desert tortoise connectivity and crossings by developing creative site-specific designs, including implementation-ready plans, specifications, and estimates for the retrofit of four culverts along SR160. The Desert Conservation Program (DCP) considers the selected culverts as grades 3 or 5 which charac ...
  • Development of UASEnabled Bridge Deck Inspection System From Investigation to Implementation
    Development of UAS-Enabled Bridge Deck Inspection System From Investigation to Implementation
    Almasi, Pouya ;
    Zhang, Qianyun
    2026-05-31 | PDF
    We introduce a pilot study that is geared towards inaugurating a UAS-centric bridge inspection program, operating on a component-level approach, with the overarching goal of enhancing the caliber of bridge inspection methodologies within the confines of New Mexico. The envisioned program encompasses the formulation of UAS-based inspection strategie ...
  • Develop a Balanced Asphalt Mixture Design Procedure
    Develop a Balanced Asphalt Mixture Design Procedure
    Hossain, Md Saddam ;
    Tarefder, Rafi
    2026-05-25 | PDF
    Balanced Mix Design (BMD) is a performance-based approach that supplements the traditional Superpave volumetric mix design process with laboratory performance testing to achieve an appropriate balance between rutting resistance and cracking resistance. This study was conducted to develop a practical BMD framework and preliminary performance criteri ...
  • Conduct Friction Testing Program Data Analysis and Effectiveness of Open Graded Friction Course
    Conduct Friction Testing Program, Data Analysis, and Effectiveness of Open Graded Friction Course
    Biswas, B S Pushpendue ;
    Tarefder, Rafi
    2026-05-25 | PDF
    This report evaluates the use of skid number (SN) data for pavement friction management in New Mexico. The study reviews current pavement friction practices, consolidates historical NMDOT Locked Wheel Skid Trailer (LWST) data, develops roadway class specific SN thresholds, and assesses SN variability, risk, and monitoring adequacy. SN records were ...
  • Receiver Vehicle and Roadway Systems for a Dynamic Wireless Power Transfer Roadway Testbed
    Receiver, Vehicle, and Roadway Systems for a Dynamic Wireless Power Transfer Roadway Testbed
    Moncada, Oscar Andrés ;
    Abram, Isaac
    2026-05-21 | PDF
    A dynamic wireless power transfer (DWPT) system using a novel three-phase transmitter/receiver design was embedded 2.4 in. beneath the surface of an existing rigid pavement on US 52/US 231 in West Lafayette, Indiana, with 85 coils installed and paired with a retrofitted Class 8 Cummins electrified truck. The system successfully delivered 50-190 kW ...
  • Michigan One Point Cone Test for Evaluating the Density of OpenGraded Drainage Course OGDC Materials
    Michigan (One Point) Cone Test for Evaluating the Density of Open-Graded Drainage Course (OGDC) Materials
    Congress, Surya S. C. ;
    Cetin, Bora
    2026-05-15 | PDF
    Pavement infrastructure is a significant public investment (over $60 billion annually in the U.S.), yet 39% of major roads are in poor condition, resulting in costly repairs and user expenses. Maximizing pavement longevity is critical to address a projected $684 billion funding gap in road maintenance, and improving compaction quality in pavement b ...
  • COVID and Traffic CrashesImpact on Safety Targets
    COVID and Traffic Crashes/Impact on Safety Targets
    Savolainen, Peter T. ;
    Gates, Timothy J.
    2026-05-14 | PDF
    The COVID-19 pandemic resulted in substantial disruptions to travel behavior and transportation systems across the United States. While traffic volumes declined sharply during the early stages of the pandemic, many jurisdictions experienced increases in traffic fatalities and serious injuries. Understanding the factors contributing to these changes ...
  • Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life
    Initial Analytical Investigation of Cantilever and Butterfly Steel Overhead Sign Trusses With Respect to Remaining Fatigue Life
    Al Shboul, Khalid W. ;
    Rasheed, Hayder A.
    2026-05-01 | PDF
    Fatigue failure of highway sign structures due to sustained wind-loading events has been recognized in many states. In fact, the American Association of State Highway and Transportation Officials specifies that the structural component should be designed for infinite life by maintaining wind-induced stress below their constant amplitude fatigue thr ...
  • Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation Technical Summary
    Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation [Technical Summary]
    Wu, Xingdong ;
    Gao, Ya
    2026-05-01 | PDF
    This study was initiated to revise the local calibration factors for version 2.6.2, released in September 2022. Another objective was to find any significant changes between the two versions that might affect the performance prediction. Also, several issues related to input material characteristics were studied.
  • Do Cities Have Too Much Parking Brief
    Do Cities Have Too Much Parking? [Brief]
    Schwartz, Ellen
    2026-05-01 | PDF
    Urban land is a limited resource, and allocating it to infrastructure devoted to storing motor vehicles — parking — reduces the amount of space available for other priorities, including housing, economic development, and green space. This issue brief synthesizes research on the large share of land devoted to parking in urban areas, the large share ...
  • Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation
    Implementation of AASHTOWare Pavement ME Design Software for the Kansas Department of Transportation
    Wu, Xingdong ;
    Gao, Ya
    2026-05-01 | PDF
    The AASHTOWare Pavement ME Design (PMED) software uses the mechanistic-empirical pavement design approach. PMED prediction models need to be calibrated to local conditions to produce accurate, reliable pavement performance predictions. Previously, multiple efforts were made to locally calibrate performance models in Kansas across various AASHTOWare ...
  • InService Evaluation of Temporary Sign Support Systems Against Wind Load
    In-Service Evaluation of Temporary Sign Support Systems Against Wind Load
    Beojone, Caio V. ;
    Pallab, Nazmus S.
    2026-05-01 | PDF
    This short study analyzes the performance of multiple temporary sign support systems under windy conditions and provides recommendations to the Bureau of Safety Programs and Engineering of the Illinois Department of Transportation (IDOT). The efforts included a literature review that summarizes past studies on the use of temporary sign support syst ...
  • Automated Methods for Correcting ODOTs RealTime GNSS Network for Survey and PostDisaster Recovery
    Automated Methods for Correcting ODOT’s Real-Time GNSS Network for Survey and Post-Disaster Recovery
    Simpson, Chase ;
    Ohene, William
    2026-05-01 | PDF
    The Oregon Real-Time GNSS Network (ORGN), managed by the Oregon Department of Transportation, serves as a critical backbone for high-precision positioning services across the state. However, the absence of a streamlined workflow for aligning ORGN station coordinates to the National Spatial Reference System (NSRS) has introduced challenges in consis ...
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