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rosaP Repository & Open Science Access Portal

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 541 - 560 of 36368 results
  • Racial Segregation in Pasadena The Role of Freeway Development and Institutional Mechanisms
    Racial Segregation in Pasadena: The Role of Freeway Development and Institutional Mechanisms
    Ong, Paul M ;
    Pech, Chhandara
    2025-05-07 | PDF
    This study documents the historical and current patterns of racial/ethnic residential segregation in Pasadena, examining the role of freeways and other mechanisms in shaping these outcomes. Using quantitative data, this project compares racial segregation in Pasadena with that in the rest of Los Angeles County and analyzes demographic changes in th ...
  • RiskBased MultiThreat DecisionSupport Methodology for LongTerm Bridge Asset Management Volume 2 Networklevel Decision Support
    Risk-Based Multi-Threat Decision-Support Methodology for Long-Term Bridge Asset Management — Volume 2: Network-level Decision Support
    Ghavidel, Alireza ;
    Mashrur, Naqib
    2025-05-03 | PDF
    In the Volume 2 report, the bridge-level AI-based maintenance decision policy previously developed in the Volume 1 report is further integrated into a network-level decision support framework, by considering network-level budget and resource constraints. A Pareto Frontier based ranking approach is proposed to rank the maintenance projects suggested ...
  • Improving MDOTs Movable Bridge Reliability and Operations
    Improving MDOT’s Movable Bridge Reliability and Operations
    Kohler, Jonathan ;
    Longfield, Matt
    2025-05-02 | PDF
    The Michigan Department of Transportation owns and operates twelve movable bridges, comprised of eleven bascule bridges and one vertical-lift bridge. These bridges often have electrical and mechanical component failures or malfunctions which can cause unplanned maintenance, traffic disruptions, and navigational disruptions. This research evaluates ...
  • NEXTGEN Concrete Tests of the Future Chloride and Sulfate Durability
    NEXTGEN Concrete – Tests of the Future: Chloride and Sulfate Durability
    Su, Dan ;
    Gurjar, Ashok H.
    2025-05-02 | PDF
    To enhance the durability of newly constructed structural elements, FDOT is seeking concrete mixes that are designed and approved based on element type and service conditions. As one of the most important concerns on concrete, the durability of concrete needs to be robustly assessed with a series of screening tests. Specifically, the chloride and s ...
  • Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures Summary
    Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures [Summary]
    Gao, Ya ;
    Jones, Christopher
    2025-05-01 | PDF
    Drum mix plants are the primary hot-mix asphalt (HMA) production plants for most Kansas Department of Transportation (KDOT) projects. In drum mix plants, a totalizer controls the input rate of virgin aggregates and recycled asphalt pavement (RAP). In current practice, the RAP percentage is determined by the input rate shown on the totalizer. Howeve ...
  • Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures
    Determining Percentage of Recycled Asphalt Pavement in Asphalt Mixtures
    Gao, Ya ;
    Jones, Christopher
    2025-05-01 | PDF
    Drum mix plants are the primary hot-mix asphalt (HMA) production plants for most Kansas Department of Transportation (KDOT) projects. In drum mix plants, a totalizer controls the input rate of virgin aggregates and recycled asphalt pavement (RAP). In current practice, the RAP percentage is determined by the input rate shown on the totalizer. Howeve ...
  • Evaluation of Rock Check Dam Performance using LargeScale Testing Techniques
    Evaluation of Rock Check Dam Performance using Large-Scale Testing Techniques
    Roche, Brian G ;
    Perez, Michael A
    2025-05-01 | PDF
    Conveyance channels are commonly used on highway construction projects to manage the flow of water through the project to downstream discharge points or stormwater detention practices. However, these channels can be at risk of erosion before stabilization due to high-velocity flows. A common erosion control practice in channels is a rock check dam, ...
  • Evaluation of Stripping Tests for Asphalt Mixtures to Replace AASHTO T283 Method in Missouri
    Evaluation of Stripping Tests for Asphalt Mixtures to Replace AASHTO T283 Method in Missouri
    Buttlar, William G. ;
    Rath, Punyaslok
    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 ...
  • Illinois Department of Transportations Seeding Standards and Best Management Practices
    Illinois Department of Transportation’s Seeding Standards and Best Management Practices
    Bollinger, Wesley ;
    Bhattarai, Rabin
    2025-05-01 | PDF
    To provide evidence-based revisions to Section 250 of the Illinois Department of Transportation roadside specifications manual, we conducted a literature review, an experimental planting, and a survey of previously planted roadsides. We created newly designed native seed mixes and field tested these mixes in comparison with existing IDOT mixes. Aft ...
  • NETC AtaGlance Phase VII 2018 2025
    NETC At-a-Glance (Phase VII 2018 – 2025)
    Seeber, Kirsten ;
    Pulver, Jeff
    2025-05-01 | PDF
    The New England Transportation Consortium (NETC) is a research cooperative among the six New England transportation agencies: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont. Since its inception in 1990, NETC has been a Federal Highway Administration (FHWA) pooled fund supported by federal State Transportation and Researc ...
  • Improving Guidance for Speed Safety Camera
    Improving Guidance for Speed Safety Camera
    Figliozzi, Miguel ;
    Wang, Haizhong
    2025-05-01 | PDF
    This report synthesizes speed safety camera elements, issues, best practices, and evidence-based results identified from a national and international review of jurisdictions employing speed safety cameras. Using these findings, this report provides recommendations to ODOT on changes and additions to the statewide speed safety camera program, as wel ...
  • Pavement MarkingColored Pavement Friction Differential and Product Durability
    Pavement Marking/Colored Pavement Friction Differential and Product Durability
    Marasteanu, Mihai O. ;
    Zanko, Lawrence M.
    2025-05-01 | PDF
    The frictional characteristics of pavement surfaces is a major component of safety. Pavement markings play a very important role in traffic flow and safety, but they also have different friction characteristics than pavement due largely to the spherical glass media needed to improve retroreflectivity for night visibility and the marking material it ...
  • Testing Analysis and Load Rating of Precast Prestressed Concrete Deck Beams with Transverse Cracks
    Testing, Analysis, and Load Rating of Precast Prestressed Concrete Deck Beams with Transverse Cracks
    Andrawes, Bassem ;
    Gunasekaran, Dachina
    2025-05-01 | PDF
    This study focused on understanding the impact of transverse cracks on the residual capacity and load rating analysis of in-service precast prestressed concrete (PPC) deck beams. Two decommissioned (33 × 36 and 21 × 36) PPC deck beams were tested under four-point bending loads to assess the impact of transverse cracks on the structural performance ...
  • 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 ...
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