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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 281 - 300 of 36585 results
  • 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 ...
  • 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 ...
  • 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 ...
  • Comparing Resistivity and Conductivity in Metal Culverts
    Comparing Resistivity and Conductivity in Metal Culverts
    Collison, Jake
    2025-12-04 | PDF
    Before installing an underground metal culvert, certain soil characteristics need to be measured to calculate its expected service life. The service life of an underground culvert is a function of the expected amount of corrosion based on the soil, the type of culvert used, and water conditions. The New Mexico Department of Transportation (NMDOT) u ...
  • 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."
  • Kansas Department of Transportation 2025 Passing Lane Guidance Technical Summary
    Kansas Department of Transportation 2025 Passing Lane Guidance [Technical Summary]
    Fitzsimmons, Eric J. ;
    Harwood, Douglas
    2025-12-01 | PDF
    This report provides comprehensive guidance for planning, locating, designing, and evaluating passing lanes on Kansas rural two-lane highways. It describes the role of passing in improving mobility by reducing platooning, lowering percent time spent following, and increasing travel speeds. Multiple passing lane configurations are outlined, with gui ...
  • Standardizing Rigid Inclusions for Transportation ProjectsPhase I Technical Summary
    Standardizing Rigid Inclusions for Transportation Projects—Phase I [Technical Summary]
    Han, Jie ;
    Lamsal, Sameep
    2025-12-01 | PDF
    Evaluation of the design methods involved a comparison of results calculated from the popular design methods BS 8006-1, EBGEO, CUR226, and the Federal Highway Administration (FHWA) for three key design parameters (load efficacy, differential settlement and reinforcement strain). The measured data were available in the literature, including 24 full- ...
  • Standardizing Rigid Inclusions for Transportation Projects Phase I
    Standardizing Rigid Inclusions for Transportation Projects — Phase I
    Han, Jie ;
    Lamsal, Sameep
    2025-12-01 | PDF
    Rigid inclusions (RIs) have increasingly been used in ground improvement technology in the United States because they effectively reduce settlement, increase bearing capacity, and enhance stability. Several design methods have been developed to analyze RI-supported embankments based on various assumptions for transportation applications. This study ...
  • Traffic Control Device Analysis Testing and Evaluation Program FY 2025 Activities
    Traffic Control Device Analysis, Testing, and Evaluation Program: FY 2025 Activities
    Finley, Melisa D. ;
    Lopez, Nicholas
    2025-12-01 | PDF
    Traffic control devices are a primary means of communicating highway information to road users and play a key role in highway automation. The design, application, and maintenance of traffic control devices are under constant transformation as new technologies, methodologies, and policies are introduced. In addition, vehicle technologies and the roa ...
  • Kansas Department of Transportation 2025 Passing Lane Guidance
    Kansas Department of Transportation 2025 Passing Lane Guidance
    Fitzsimmons, Eric J. ;
    Harwood, Douglas
    2025-12-01 | PDF
    This report provides comprehensive guidance for planning, locating, designing, and evaluating passing lanes on Kansas rural two-lane highways. It describes the role of passing in improving mobility by reducing platooning, lowering percent time spent following, and increasing travel speeds. Multiple passing lane configurations are outlined, with gui ...
  • A Path Forward for Transit Rider Experience and Safety Lessons from the LA Metro Ambassador Pilot Program
    A Path Forward for Transit Rider Experience and Safety: Lessons from the LA Metro Ambassador Pilot Program
    Wasserman, Jacob L. ;
    Brozen, Madeline
    2025-12-01 | PDF
    A growing number of U.S. transit agencies are adding transit ambassadors to their systems to improve the customer service and safety experience for passengers. These personnel can play a variety of different roles, including providing wayfinding, system navigation, fare payment support, and other passenger support roles that enhance the customer ex ...
  • Machine Vision Approach to Retroreflectivity Measurements
    Machine Vision Approach to Retroreflectivity Measurements
    Raj, Sumit ;
    Senske, Nickolas
    2025-12-01 | PDF
    This report presents a complete evaluation of the machine-vision-based dynamic retroreflectometer system (DRS) with a 30-m geometry scaled to 12-m, manufactured by Reflective Measurement Systems Ltd, 100% owners of RetroTekUSA. The assessment includes pavement marking evaluation, including line striping retroreflectivity, line striping width, color ...
  • A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data
    A Computational Tool for the Reliable Prediction of Pavement Performance based on Temperature Data
    dos Santos, Ketson ;
    Marasteanu, Mihai O.
    2025-12-01 | PDF
    This study presents a computational tool for predicting pavement performance using long-term temperature data from thermocouple trees embedded in three flexible and two rigid pavement sections at the MnROAD facility. The research leverages spectral and probabilistic analyses to assess thermal behavior and its impact on pavement condition. Temperatu ...
  • Bismarck Mandan Regional ITS Architecture Update Version 50
    Bismarck- Mandan Regional ITS Architecture Update [Version 5.0]
    Hasan, Sharijad
    2025-12-01 | PDF
    The Bismarck-Mandan Regional Intelligent Transportation Systems (ITS) Architecture was developed under the guidance of the Bismarck-Mandan Metropolitan Planning Organization (Bis-Man MPO). Initially created in 2005, this architecture has undergone four updates in 2008, 2013, 2021, and 2025. Its primary purpose is to guide the implementation of ITS ...
  • Investigation of Dolomite Aggregate LongTerm Cementation and Its Potential Advantage for Building Roads
    Investigation of Dolomite Aggregate Long-Term Cementation and Its Potential Advantage for Building Roads
    Kong, Taeyun ;
    Kothari, Chirayu
    2025-12-01 | PDF
    This study investigated the mechanical strength and freeze-thaw durability of carbonate-based aggregate quarry by-products (QBs) stabilized with cement alone and in combination with calcined clay (metakaolin, MK) for potential use in pavement foundation layers. The primary objective was to evaluate the chemical and physical characteristics of dolom ...
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