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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 141 - 160 of 36336 results
  • Strategies for Improving the Cracking Resistance of Alabama Mixes
    Strategies for Improving the Cracking Resistance of Alabama Mixes
    Sadeghi, Mohammad ;
    Hartzog, Zane
    2026-01-01 | PDF
    This project evaluated practical strategies for improving the cracking resistance of asphalt surface mixtures in Alabama while ensuring adequate resistance to rutting. The study focused on Superpave surface mixtures commonly used by the Alabama Department of Transportation (ALDOT) and examined three types of adjustments: binder content and grade, a ...
  • Low and Intermediate Temperature Evaluation of Asphalt Binders Through Dynamic Shear Rheometer Technical Summary
    Low and Intermediate Temperature Evaluation of Asphalt Binders Through Dynamic Shear Rheometer [Technical Summary]
    Salari, Saman ;
    Cooper, Samuel B., III
    2026-01-01 | PDF
    The primary objective of this research was to evaluate the effectiveness of newly proposed methods (iCCL, UTFO, and WRI) for the low-temperature performance grading of asphalt binders by comparing them against the conventional Bending Beam Rheometer (BBR) test. Ultimately, this study aimed to determine whether these alternative methods can provide ...
  • Balanced Mix Design a 1Year Reality Check on Quality Control Testing and State DOT Adoption Technical Summary
    Balanced Mix Design- a 1-Year Reality Check on Quality Control Testing and State DOT Adoption [Technical Summary]
    Huang, Baoshan ;
    Huang, Kai
    2026-01-01 | PDF
    The objectives of this study were to synthesize BMD implementation and related research in the southeastern U.S. region on essential topics within the BMD framework through a comprehensive review of ongoing and completed studies on BMD procedures. The research team also conducted a two-round survey of current BMD practices to document the implement ...
  • Enhancing Accessibility for Individuals With Limited Mobility Leveraging AI and Cycling Data for an Inclusive Active Transportation Network
    Enhancing Accessibility for Individuals With Limited Mobility: Leveraging AI and Cycling Data for an Inclusive Active Transportation Network
    Thapa, Madhu Mausam ;
    Luitel, Sanjay
    2026-01-01 | PDF
    This study introduces a low-cost, scalable framework for monitoring and assessing the condition of paved trail infrastructure to enhance accessibility for all users, particularly those with limited mobility. The research utilizes a custom-built "Data Bike" with GPS and accelerometers embedded with high-resolution cameras to collect multimodal data ...
  • Assessment of Truck Parking Demand and Safety During Normal and Severe Weather Conditions in Nebraska
    Assessment of Truck Parking Demand and Safety During Normal and Severe Weather Conditions in Nebraska
    Huynh, Nathan ;
    Zhao, Li
    2026-01-01 | PDF
    This project examined truck parking capacity, demand, and utilization patterns along I-80 in Nebraska. The objectives were to (1) document the capacity of public and private truck parking facilities along I-80, (2) analyze spatial and temporal trends in parking demand, (3) develop models to predict occupancy at parking facilities, (4) identify clus ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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."
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