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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 221 - 240 of 36841 results
  • Analysis of the Potential Revenue and Equity Impacts of an ECommerce Household Delivery Fee in Oregon
    Analysis of the Potential Revenue and Equity Impacts of an E-Commerce Household Delivery Fee in Oregon
    Figliozzi, Miguel
    ORCID ICON IMG
    2026-03-01 | PDF
    The research goal of this project is to better understand the potential implications of a household e-commerce delivery fee. A survey was developed to study the factors that impact potential revenue and its equity implications.
  • Use of FiberReinforced Polymer Composites for Bridge Repairs in Montana
    Use of Fiber-Reinforced Polymer Composites for Bridge Repairs in Montana
    Ahmed, Emtiaz ;
    Matteson, Kirsten
    2026-03-01 | PDF
    Montana’s timber bridge inventory includes over 600 state and county owned bridges, many more than 80 years old and showing visible deterioration. Traditional girder repair methods, such as steel hangers and timber or steel sister girders, are heavy, labor-intensive, and often lack well-documented performance verification. Fiber-reinforced polymer ...
  • Optimizing Missouris Statewide Transportation Improvement Program Letting and Construction Schedule
    Optimizing Missouri's Statewide Transportation Improvement Program Letting and Construction Schedule
    Loos, Ryan ;
    Adams, Bill
    2026-03-01 | PDF
    This study evaluated how Missouri’s annual letting calendar could be structured to improve competition and lower award costs while remaining feasible under existing policies and delivery practices. Historical bid outcomes were used to estimate monthly “performance curves” that related workload share to observed price behavior. A genetic algorithm t ...
  • Accurate Collection and Reporting of Worker Presence in Work Zones
    Accurate Collection and Reporting of Worker Presence in Work Zones
    Qing, Zhu ;
    Adu-Gyamfi, Yaw
    2026-03-01 | PDF
    Highway work zones remain high-risk environments due to the close interaction between workers, live traffic, and heavy equipment. While platforms like the Work Zone Data Exchange (WZDx) and DOT traveler information maps provide location and traffic impact data, real-time, verified information regarding actual worker presence is often unavailable. T ...
  • Accurate Collection and Reporting of Worker Presence in Work Zones Summary
    Accurate Collection and Reporting of Worker Presence in Work Zones [Summary]
    Qing, Zhu ;
    Adu-Gyamfi, Yaw
    2026-03-01 | PDF
    Highway work zones remain high-risk environments due to the close interaction between workers, live traffic, and heavy equipment. While platforms like the Work Zone Data Exchange (WZDx) and DOT traveler information maps provide location and traffic impact data, real-time, verified information regarding actual worker presence is often unavailable. T ...
  • OpenGraded Friction Courses Suitable for Suburban Environments Summary
    Open-Graded Friction Courses Suitable for Suburban Environments [Summary]
    Tran, Nam ;
    Moseley, Howie
    2026-03-01 | PDF
    The project aimed to evaluate the impact of four strategies designed to improve the durability of FC-5 mixtures: employing a 9.5-mm nominal maximum aggregate size (NMAS) gradation; using a high polymer (HP) modified binder in the mixture; assessing the effectiveness of a 12.5-mm stone matrix asphalt (SMA); and exploring an alternative friction cour ...
  • Factors That Influence the Variability of Concrete Surface Resistivity of Field Cast Samples Summary
    Factors That Influence the Variability of Concrete Surface Resistivity of Field Cast Samples [Summary]
    DeLorenzo, Richard ;
    Riding, Kyle A.
    2026-03-01 | PDF
    The main objective of this research was to identify and quantify the factors that influence resistivity measurements in concrete samples, comparing field- and laboratory-fabricated specimens (per AASHTO T 358 and AASHTO TP 119).
  • Confinement Effect of Narrow Baseplates or Reaction Area on Anchor Breakout Part 3 Summary
    Confinement Effect of Narrow Baseplates or Reaction Area on Anchor Breakout, Part 3 [Summary]
    Suksawang, Nakin ;
    Nolan, Steven
    2026-03-01 | PDF
    The research aimed to evaluate how screw anchors actually perform in real FDOT conditions, understand why the current ACI design approach is conservative, and develop improved FDOT design guidelines that safely allow screw anchors to be used more widely, without unnecessary restrictions.
  • Optimizing Missouris Statewide Transportation Improvement Program Letting and Construction Schedule Summary
    Optimizing Missouri's Statewide Transportation Improvement Program Letting and Construction Schedule [Summary]
    Loos, Ryan ;
    Adams, Bill
    2026-03-01 | PDF
    This study evaluated how Missouri’s annual letting calendar could be structured to improve competition and lower award costs while remaining feasible under existing policies and delivery practices. Historical bid outcomes were used to estimate monthly “performance curves” that related workload share to observed price behavior. A genetic algorithm t ...
  • Developing Data Sources and Standards for Supporting Arterial TSMO Implementation of the Statewide Arterial Management Program STAMP Summary
    Developing Data Sources and Standards for Supporting Arterial TSM&O Implementation of the Statewide Arterial Management Program (STAMP) [Summary]
    Heery, Fred ;
    Abdel-Aty, Mohamed
    2026-03-01 | PDF
    The project aimed to develop data sources, standards, and actionable guidance that FDOT can use to strengthen arterial TSM&O implementation statewide. This included reviewing the literature, evaluating existing software tools, identifying best practices from other departments of transportation, and creating recommendations tailored to Florida’s dis ...
  • Enhancement of AASHTOWare Bridge Management for Floridas Bridge Inspection and Asset Management Summary
    Enhancement of AASHTOWare Bridge Management for Florida’s Bridge Inspection and Asset Management [Summary]
    Padilla, Felix ;
    Sobanjo, John O.
    2026-03-01 | PDF
    The primary objective of the research was to help FDOT successfully implement and optimize the AASHTOWare BrM software by recalibrating its essential analytical models—such as deterioration, risk, cost, and data translation tools—so the software can more accurately forecast bridge performance, support decision-making, and satisfy federal requiremen ...
  • Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing Material Characterization and Design Summary
    Waterline Pile Cap Footings for Bridges Using Large Diameter FRP Reinforcing – Material Characterization and Design [Summary]
    Nanni, Antonio ;
    Nolan, Steven
    2026-03-01 | PDF
    The objective of the research was to identify what further research is needed to use larger FRP bars in waterline pile cap footings, develop material acceptance criteria and design specifications for No. 11 glass FRP bars, and create design examples to help implement these bars in practice. Additionally, the study provided recommendations for futur ...
  • NEXTGEN Concrete Tests of the Future Chloride and Sulfate Durability Summary
    NEXTGEN Concrete – Tests of the Future: Chloride and Sulfate Durability [Summary]
    Su, Dan ;
    Simmons, Ronald
    2026-03-01 | PDF
    The objective of this project was to determine appropriate screening thresholds for tests that assess concrete durability in extremely aggressive chloride and sulfate environments. Specifically, the research aimed to recommend threshold values for bulk and surface resistivity tests (based on AASHTO TP 119 and T 358) for chloride durability, and for ...
  • PavementME Rehabilitation Design Protocols for MDOT Implementation
    Pavement-ME Rehabilitation Design Protocols for MDOT Implementation
    Haider, Syed Waqar ;
    Lali, Faizan Ahmad
    2026-03-01 | PDF
    This study delivers a Michigan-specific mechanistic-empirical framework for rehabilitation pavement design by locally calibrating PMED V2.6 across all major MDOT rehabilitation fixes, including asphalt over asphalt/concrete/rubblized concrete/crushed asphalt, and concrete over asphalt/concrete. Using 14 field projects, FWD, GPR, LWD, and field core ...
  • 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 ...
  • North Dakota Grain and Oilseed Transportation Statistics 202425
    North Dakota Grain and Oilseed Transportation Statistics: 2024–25
    Vachal, Kimberly ;
    Peterson, Del
    2026-03-01 | PDF
    The 2024-25 North Dakota Grain and Oilseed Transportation Statistics Report was prepared by Kimberly Vachal, Del Peterson, and Doug Benson, Upper Great Plains Transportation Institute. The authors gratefully acknowledge the desktop publishing assistance of Bev Trittin. This report represents a continuation of analysis concerned with the patterns an ...
  • Annual North Dakota Elevator Marketing Report 202425
    Annual North Dakota Elevator Marketing Report, 2024–25
    Vachal, Kimberly ;
    Peterson, Del
    2026-03-01 | PDF
    The Annual North Dakota Elevator Marketing Report for 2024–25 was prepared by the Upper Great Plains Transportation Institute. The authors gratefully acknowledge the assistance of the North Dakota Soybean Council, the North Dakota Corn Utilization Council, the North Dakota Wheat Commission, and the North Dakota Department of Agriculture in compilin ...
  • 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 ...
  • 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 ...
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