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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 61 - 80 of 36049 results
  • Creation of an Allweather Road Impact Prediction System ARIPS
    Creation of an All-weather Road Impact Prediction System (ARIPS)
    Reeves, Heather D. ;
    Rosenow, Andrew A.
    2026-01-01 | PDF
    This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri ...
  • Creation of an Allweather Road Impact Prediction System ARIPS Summary
    Creation of an All-weather Road Impact Prediction System (ARIPS) [Summary]
    Reeves, Heather D. ;
    Rosenow, Andrew A.
    2026-01-01 | PDF
    This project is designed to examine the utility of using the database of flood-induced road closures collected by MoDOT to develop an Artificial Intelligence/Machine Learning (AI/ML) model. This was accomplished by assembling a database of predictors. These predictors include quantitative precipitation estimates, hydrologic model output, and a seri ...
  • Quantifying Maritime Chokepoint Disruptions Using AIS Data A PostEvent Impact Measurement Framework for Networked Transportation Systems
    Quantifying Maritime Chokepoint Disruptions Using AIS Data: A Post-Event Impact Measurement Framework for Networked Transportation Systems
    Im, Yunseop
    2026-01-01 | PDF
    This document records an analytical review of a post-event measurement approach applied to major maritime chokepoint disruptions using AIS vessel presence data. The purpose of the work is limited in scope. It is intended to support after-action assessment and comparison of disruption effects once abnormal operating conditions have already materiali ...
  • Developing a Pedestrian Safety Performance Function for Oregon
    Developing a Pedestrian Safety Performance Function for Oregon
    Roll, Josh ;
    Anderson, Jason
    2026-01-01 | PDF
    This report details the development of a pedestrian safety performance function (SPF) for intersections in urban areas in the state of Oregon. The report documents the process to develop SPFs for pedestrian crashes including the process to develop the data for analysis. A key innovation of this work is the use of pedestrian traffic volume estimates ...
  • Developing Sight Distance Guidelines for UTurn Maneuvers
    Developing Sight Distance Guidelines for U-Turn Maneuvers
    Tsai, Yichang (James) ;
    Agnihotri, Atharv
    2026-01-01 | PDF
    This project, conducted by the Georgia Tech research team in collaboration with the Georgia Department of Transportation (GDOT), aims to develop safe and practical U-turn sight distance (UTSD) guidelines for Reduced Conflict U-turn (RCUT) intersections. The research analyzed video footage from GDOT to quantify U-turn maneuver times under varying me ...
  • Computational Fluid Dynamics Investigation of High Mast Illumination Poles Influence of Light Fixtures Technical Summary
    Computational Fluid Dynamics Investigation of High Mast Illumination Poles: Influence of Light Fixtures [Technical Summary]
    Junge, Briceson ;
    Bennett, Caroline
    2026-01-01 | PDF
    The objective of this study was to determine the influence of luminaire type on the susceptibility of HMIPs to vortex shedding using a computational fluid dynamics (CFD) modeling approach. Two types of luminaires were considered: LED and incandescent fixtures. The number of light fixtures was varied, along with orientation of the fixtures with resp ...
  • Cold InPlace Recycle CIR and FullDepth Reclamation FDR in Arizona
    Cold In-Place Recycle (CIR) and Full-Depth Reclamation (FDR) in Arizona
    Mamlouk, Michael S. ;
    Aker, Saed
    2026-01-01 | PDF
    The primary goal of this study was to develop guidance materials for the Arizona Department of Transportation's (ADOT’s) consideration for the adoption and implementation of CIR and FDR technologies. The first objective in accomplishing this goal was to summarize the current state of the practice on the key engineering factors that could contribute ...
  • Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database Technical Summary
    Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database [Technical Summary]
    McVey, Isaac ;
    Husic, Admin
    2026-01-01 | PDF
    The primary objective of this study was to develop and evaluate a statistical model using the National Bridge Inventory (NBI) database to establish baseline load ratings for bridges in Kansas. A linear regression model was used to identify key variables, such as age and bridge condition, that correlate with recorded inventory and operating load rat ...
  • Computational Fluid Dynamics Investigation of High Mast Illumination Poles Influence of Light Fixtures
    Computational Fluid Dynamics Investigation of High Mast Illumination Poles: Influence of Light Fixtures
    Junge, Briceson ;
    Bennett, Caroline
    2026-01-01 | PDF
    High Mast Illumination Poles (HMIPs) are lighting towers that are taller than 55 ft (16.8 m) and are typically located along highways and rest stops. In March 2019, a wind event, referred to as a “bomb cyclone,” caused several HMIPs in Kansas to excite and experience large-amplitude deflections on the order of several feet called “lock-in” behavior ...
  • Effectiveness of Automated Speed Enforcement in School Zones and Guidance for Continuous Usage in Georgia
    Effectiveness of Automated Speed Enforcement in School Zones and Guidance for Continuous Usage in Georgia
    Dissanayake, Sunanda ;
    Bhavsar, Parth
    2026-01-01 | PDF
    One of the growing concerns for transportation agencies is speed management in school zones, as it is vital to children's safety. Automated Speed Enforcement (ASE) is one of the measures to address speed management concerns. As of January 2024, approximately 286 schools across Georgia were equipped with ASE cameras, aiming to improve traffic safety ...
  • Virginias 2024 Implementation of Balanced Mix Design
    Virginia’s 2024 Implementation of Balanced Mix Design
    Diefenderfer, Stacey D. ;
    Smith, Bryan C.
    2026-01-01 | PDF
    The Virginia Department of Transportation (VDOT) implemented balanced mix design (BMD) performance testing for asphalt mixture design and production in the 2024 paving season. The BMD approach seeks to achieve asphalt mixtures that have properties to resist both cracking and rutting distresses and to increase durability. This implementation of BMD ...
  • Emergency Management Strategies for Electric Vehicles
    Emergency Management Strategies for Electric Vehicles
    Goodall, Noah J.
    2026-01-01 | PDF
    Electric vehicle fires present unique challenges for roadway incident management due to lithium-ion battery thermal runaway characteristics that can result in extended suppression durations, toxic emissions, and reignition risks. This study assessed the prevalence and operational impacts of electric vehicle fires through analysis of vehicle fire in ...
  • Partnering With Transportation Network Companies to Serve LowDensity Communities
    Partnering With Transportation Network Companies to Serve Low-Density Communities
    Darling, Wesley ;
    Cassidy, Michael J.
    2026-01-01 | PDF
    This study addresses the persistent challenge of delivering cost-effective, high-quality on-demand transit in low-density communities. Traditional microtransit services often struggle in such areas due to high fixed costs and limited opportunities to consolidate trips, while community partnerships with transportation network companies (TNCs) like U ...
  • Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database
    Development of Adjustment Factors and Load Ratings via Statistical Analyses of the National Bridge Inventory Database
    McVey, Isaac ;
    Husic, Admin
    2026-01-01 | PDF
    This study developed a new approach to establish baseline load ratings for bridges in Kansas without plans using data from the National Bridge Inventory (NBI). The approach is comprised of linear regression models to estimate load ratings for bridges with a condition rating of 8 or higher and adjustment factors to lower the estimated load rating to ...
  • 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 ...
  • 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 ...
  • 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 ...
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