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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 441 - 460 of 36054 results
  • Development of the Texas Freight Flow Model TFFM Application A Tool for Assessing Impacts of Changes in Freight Flows on the Texas Highway Freight Network
    Development of the Texas Freight Flow Model (TFFM) Application: A Tool for Assessing Impacts of Changes in Freight Flows on the Texas Highway Freight Network
    Morgan, Curtis A. ;
    Sivaraman, Vijayaraghavan
    2025-05-01 | PDF
    Texas Department of Transportation (TxDOT) Project 0-7037 was initiated to develop a model/tool that could help TxDOT and other transportation planners estimate and assess impacts of changes in freight traffic flow on the Texas Highway Freight Network more quickly than by conducting a full Statewide Analysis Model run. The goal was to produce a too ...
  • Trends and Challenges Posed by MediumDuty Trucks to the Operation and Safety of Oregon Highways
    Trends and Challenges Posed by Medium-Duty Trucks to the Operation and Safety of Oregon Highways
    Hernandez, Salvador ;
    Velasquez, Brianna
    2025-05-01 | PDF
    This study evaluates medium-duty vehicle operations and safety in Oregon to understand impact of e-commerce growth and logistics changes. The objectives were to analyze trends, assess safety risks, and provide policy recommendations. Data from the Oregon Department of Transportation (ODOT) Crash Data System, the Commercial Motor Vehicle crash datab ...
  • Construction Cost Inflation Model
    Construction Cost Inflation Model
    Colsch, Nick
    2025-05-01 | PDF
    Federal legislation requires state departments of transportation to consider and apply inflation to the costs of transportation projects. However, there is no guidance on how inflation should be calculated. Previous research on this topic primarily focused on developing construction cost indexes. Previous methods of prediction included neural netwo ...
  • A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR Phase 2
    A Pavement Marking Inventory and Retroreflectivity Condition Assessment Method Using Mobile LiDAR – Phase 2
    Hou, Qing ;
    Remache-Patino, Bryan
    2025-05-01 | PDF
    FHWA has recently released the new MUTCD, which includes requirements for maintaining minimum levels of retroreflectivity for pavement marking. Such regulatory compliance poses a challenge to agencies because conventional visual inspection methods are labor-intensive, and the results can be subjective. MassDOT has recently completed Phase 1 of this ...
  • A Scheduling Assistant Toolkit for GDOTs Effective Planning of Transportation Projects
    A Scheduling Assistant Toolkit for GDOT’s Effective Planning of Transportation Projects
    Pishdad, Pardis ;
    de la Garza, Jesus M
    2025-05-01 | PDF
    The Scheduling Assistant Toolkit was developed to enhance the Georgia Department of Transportation’s (GDOT) project scheduling efficiency by providing data-driven recommendations on optimal activity overlapping strategies. Traditional scheduling methods often rely on finish-to-start dependencies, leading to unnecessarily long project durations and ...
  • Improving Maintenance of OpenGraded Friction Course in Louisiana Summary
    Improving Maintenance of Open-Graded Friction Course in Louisiana [Summary]
    Mayeux, Corey R
    2025-05-01 | PDF
    Open-Graded Friction Course (OGFC) is a specialized asphalt concrete mixture used for thin-wearing courses, offering significant safety, economic, and environmental benefits. The porous structure of OGFC enhances drainage, reduces hydroplaning, and improves road visibility, particularly during wet weather conditions. Despite its potential advantage ...
  • Evaluation of PostMounted Delineators and Curve Warning Message Markings Phase 1 Designing a Sampling Plan
    Evaluation of Post-Mounted Delineators and Curve Warning Message Markings Phase 1: Designing a Sampling Plan
    Appiah, Justice ;
    Cho, Hyun W.
    2025-05-01 | PDF
    In 2022, the Virginia Transportation Research Council published Guidance for and Effectiveness of Low-Cost Delineation Treatments, a report that evaluated the effectiveness of several low-cost delineation countermeasures (Flintsch et al., 2022a). That report recommended that the Virginia Department of Transportation (VDOT) consider a pilot study of ...
  • Sustainable Application of TDA in Stormwater Infiltration and Treatment
    Sustainable Application of TDA in Stormwater Infiltration and Treatment
    Natarajan, Poornima ;
    Gulliver, John S.
    2025-05-01 | PDF
    The objective of this research was to determine the efficacy and cost-effectiveness of the application of tire-derived aggregate (TDA) in stormwater treatment and management systems. We reaffirmed that TDA is an excellent means of retaining phosphate (soluble reactive phosphorus) in stormwater runoff. In addition, we found that biofilms grow on TDA ...
  • Assess Driver Distraction in an Era of Rapid Technological Change for Digital Advertising Billboards Technical Report
    Assess Driver Distraction in an Era of Rapid Technological Change for Digital Advertising Billboards: Technical Report
    Pike, Adam ;
    Shirinzad, Maryam
    2025-05-01 | PDF
    Outdoor advertising signs impact millions of travelers around the world every day. These signs are designed to attract driver attention, thus taking it away from the driving task. Driver inattention and distraction are two critical factors for road safety. Regulation of outdoor advertising signs must deal with changing technologies, including digit ...
  • Evaluation of Stripping Tests for Asphalt Mixtures to Replace AASHTO T283 Method in Missouri Research Summary
    Evaluation of Stripping Tests for Asphalt Mixtures to Replace AASHTO T283 Method in Missouri [Research Summary]
    Buttlar, William G.
    2025-05-01 | PDF
    Currently, many paving agencies in the U.S. including the Missouri Department of Transportation (MoDOT) use the AASHTO T283 method (Tensile Strength Ratio (TSR) test) to determine the moisture damage susceptibility of asphalt mixtures. However, the TSR test has been shown to have a poor correlation with field results based on a review of literature ...
  • Improving Safety for People Walking and Biking at Roundabouts
    Improving Safety for People Walking and Biking at Roundabouts
    Savolainen, Peter T. ;
    Gates, Tim J
    2025-05-01 | PDF
    Roundabouts have been shown to enhance safety by lowering travel speeds as compared to other intersection designs. However, pedestrian and bicyclist crossings at roundabouts present unique challenges. Low yielding rates can heighten the risk of crashes, especially at entry and exit points. This study examines driver yielding behavior toward pedestr ...
  • Avoiding and Minimizing Impacts to Aquatic Resources through Construction Design Standards
    Avoiding and Minimizing Impacts to Aquatic Resources through Construction Design Standards
    Swedberg, Dusty A ;
    Willink, Phillip W
    2025-05-01 | PDF
    The primary objective was to summarize best management practices that avoid and minimize impacts on aquatic resources through construction design standards. The study involved a literature review and discussions with experts to identify knowledge gaps regarding the effects of road and bridge construction on aquatic resources. We examined how other ...
  • Tools for Capital Improvement Planning
    Tools for Capital Improvement Planning
    Minnesota Local Road Research Board
    2025-05-01 | PDF
    This guide was developed to help Minnesota local agencies better understand and compare Capital Improvement Planning (CIP) software tools. The guide summarizes key features, functionalities, and support offerings across several CIP-related solutions, based on vendor-provided information and publicly available materials. The Technical Advisory Panel ...
  • Harnessing Solar Energy through Solar Snow Fence Implementation
    Harnessing Solar Energy through Solar Snow Fence: Implementation
    Yang, Mijia ;
    Yu, Yao
    2025-05-01 | PDF
    A 100-ft field implementation of the proposed solar snow fence was conducted In Glyndon, MN. The implementation process started with the manufacturing of solar stripe frames, U connection with steel posts, helical piling, electrical power harvest and storage, electrical use in snow melting, and monitoring of the solar snow fence systems. A 12-ft la ...
  • Stone Matrix Asphalt SMA Overlay Performance Evaluation
    Stone Matrix Asphalt (SMA) Overlay Performance Evaluation
    Lee, Jusang M ;
    Jeon, Jongmyung
    2025-05-01 | PDF
    Stone matrix asphalt (SMA) is a specialized asphalt mixture designed to improve pavement performance by combining a coarse aggregate skeleton with a high-binder content mortar. This innovative design, adopted by the Indiana Department of Transportation (INDOT) in the late 1990s, offers distinct advantages over conventional hot mix asphalt (HMA). Cu ...
  • Supplementary Cementitious Materials for Chloride Resistance of Bridge Decks
    Supplementary Cementitious Materials for Chloride Resistance of Bridge Decks
    Bordelon, Amanda C ;
    Clyde, Madison
    2025-05-01 | PDF
    The purpose of this report is to present the measured properties and comparison between concrete mixtures consisting of different available supplementary cementitious materials (SCMs) for the purpose of understanding which SCM provides the best chloride resistance for bridge decks in Utah. The concrete batches were created in the Utah Valley Univer ...
  • Asset Condition Assessment Using AI and Computer Vision
    Asset Condition Assessment Using AI and Computer Vision
    Mashhadi, Ali ;
    Black, Clancy W.
    2025-05-01 | PDF
    UDOT faces significant challenges in manually inspecting roadside safety assets across its extensive roadway network, prompting the need for automated condition assessment solutions. This project leverages street-level image data to develop an AI-driven framework for assessing primary assets (guardrails, cable barriers, concrete barriers) and secon ...
  • First Responder Interactions with Automated Vehicles An Identification of Needs and Strategies
    First Responder Interactions with Automated Vehicles: An Identification of Needs and Strategies
    Trefz, Bradley ;
    Ivie, Ray
    2025-05-01 | PDF
    The rapid deployment of automated vehicles presents both opportunities and challenges, especially for first responders tasked with ensuring public safety during emergencies. This research project, led by the Texas A&M Transportation Institute, in partnership with the Texas A&M Engineering Extension, addressed critical needs and strategies for inter ...
  • Impact of Heavy Commercial Electric Vehicles on Flexible Pavements
    Impact of Heavy Commercial Electric Vehicles on Flexible Pavements
    Jayme, Angeli ;
    Hernandez, Jaime
    2025-05-01 | PDF
    Heavy-duty electric vehicles (HDEV) pose challenges to flexible pavements. This study evaluated four Illinois pavement structures to quantify HDEV impacts on pavements. Compounding factors included increases in load and acceleration, which escalated critical strains and reduced repetitions to failure. Various distresses were considered: bottom-up c ...
  • Construction Cost Inflation Model Data Management Plan
    Construction Cost Inflation Model: Data Management Plan
    Colsch, Nick
    2025-05-01 | PDF
    Federal legislation requires state departments of transportation to consider and apply inflation to the costs of transportation projects. However, there is no guidance on how inflation should be calculated. Previous research on this topic primarily focused on developing construction cost indexes. Previous methods of prediction included neural netwo ...
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