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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 121 - 140 of 36368 results
  • The Impacts of Minimum Parking Requirements A Research Synthesis
    The Impacts of Minimum Parking Requirements: A Research Synthesis
    Schwartz, Ellen ;
    Manville, Michael
    2026-02-01 | PDF
    Across the United States and around the world, cities are increasingly reconsidering, and often repealing, minimum parking requirements. They are doing so to align their parking policy with their housing, climate, and mobility goals. While minimums can help increase parking availability and prevent curb parking from becoming overcrowded, they can a ...
  • Benchmarking Computer VisionBased Approaches To Derive EngineeringOriented Condition From Existing UDOT Assets Data
    Benchmarking Computer Vision-Based Approaches To Derive Engineering-Oriented Condition From Existing UDOT Assets Data
    Pandey, Shailaja Ratna ;
    Esteghamati, Mohsen Zaker
    2026-02-01 | PDF
    Condition assessment of how transportation infrastructure supports safe and reliable road and highway operation. Departments of Transportation across the country rely heavily on manual inspections, which are time-consuming and costly. This study evaluated whether modern computer vision (CV) methods can support traffic sign condition assessment alon ...
  • Special Crash Investigations Remote Frontover Incident Investigation Vehicle 2022 Honda Civic Location California Incident Date March 2023
    Special Crash Investigations: Remote Frontover Incident Investigation; Vehicle: 2022 Honda Civic; Location: California; Incident Date: March 2023
    Dynamic Science, Inc.
    2026-02-01 | Special Crash Investigations | PDF
    This Special Crash Investigations report documents the remote investigation of a frontover incident in California in March 2023 that involved two pedestrians, a 62-year-old male and 60-year-old female, who were struck by a 2022 Honda Civic driven by an unlicensed, belted 18-year-old male. The Honda was stopped at a traffic signal in the right turn ...
  • Assessment of Winter Maintenance Performance Objectives Using Maintenance Decision Support System
    Assessment of Winter Maintenance Performance Objectives Using Maintenance Decision Support System
    Walker, Curtis L. ;
    Anderson, Mark R.
    2026-01-31 | PDF
    It is important for transportation agencies to assess their winter maintenance operations performance to identify areas for improvement and/or resource investment to maintain optimal levels of service, mobility, and safety. This study explores nine winter snowstorms in Nebraska during the 2023-2024 winter season across 20 road segments, 12 of which ...
  • Caltrans Field Trials of the Intelligent TruckMounted Attenuator ITMA
    Caltrans Field Trials of the Intelligent Truck-Mounted Attenuator (ITMA)
    Torick, Dave ;
    Kumar, Dinesh
    2026-01-30 | PDF
    Truck-mounted attenuator (TMA) operators are exposed to traffic-related hazards during Caltrans maintenance operations. To help reduce this exposure, the Advanced Highway Maintenance and Construction Technology Research Center (AHMCT), in partnership with Caltrans, conducted controlled public-road field trials of the Intelligent Truck-Mounted Atten ...
  • MultiObjective Decision Analysis and Optimization Model for Transportation Investment DecisionMaking at MDOT
    Multi-Objective Decision Analysis and Optimization Model for Transportation Investment Decision-Making at MDOT
    Robert, William ;
    Bliss, Abigail
    2026-01-29 | PDF
    Multi-objective decision analysis (MODA) provides transportation agencies with a structured process for identifying a set of investments that delivers the greatest impact toward their objectives. In the presented research, the research team developed a prototype MODA-based approach for prioritizing pavement rehabilitation and reconstruction project ...
  • Evaluation of Rolled Erosion Control Products and Seed Mixes for Vegetation Establishment on Slopes
    Evaluation of Rolled Erosion Control Products and Seed Mixes for Vegetation Establishment on Slopes
    Donaldson, Bridget M. ;
    Rossetti, Maria S.
    2026-01-01 | PDF
    Because transportation construction projects often result in steep slopes with disturbed, bare soils that are sensitive to runoff and erosion processes, vegetation establishment is a continual challenge for transportation departments. The Virginia Department of Transportation (VDOT) regularly uses rolled erosion control products (RECPs) to mitigate ...
  • Development of Equipment Rental Schedule for Illinois
    Development of Equipment Rental Schedule for Illinois
    Bian, Zheyong ;
    Dong, Zhijie
    2026-01-01 | PDF
    During highway construction, the Illinois Department of Transportation (IDOT) resident engineer commonly adds “extra work” to the contract as needed for satisfactory completion of the project. One of the formats for contractor reimbursement requires establishing an hourly compensation rate for contractor-owned equipment used to perform the extra wo ...
  • AIA Recommendations for Ultrasound Inspection of New Make Turbine Engine LifeLimited Rotating Parts
    AIA Recommendations for Ultrasound Inspection of New- Make Turbine Engine, Life-Limited Rotating Parts
    Aerospace Industries Association of America  ...
    2026-01-01 | PDF
    The aero gas turbine industry has collaborated with the Federal Aviation Administration (FAA) to study and provide guidance regarding the inspection process for the subsurface volume of critical nickel-based engine hardware, through the Aerospace Industries Association (AIA) team AIA A-18-003. Data from across a broad spectrum in the industry is ne ...
  • An Analysis of VDOTs Sight Distance Requirements Relative to ContextSensitive Designs
    An Analysis of VDOT’s Sight Distance Requirements Relative to Context-Sensitive Designs
    Lamsal, Sharad ;
    McKinney, Jonathan
    2026-01-01 | PDF
    Intersection sight distance (ISD) requirements are intended to enhance safety by ensuring visibility at intersections. However, in dense urban areas, these requirements can preclude elements of the urban streetscape, such as street trees, on-street parking, and transit infrastructure, and can restrict compact mixed-use developments, such as traditi ...
  • 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 ...
  • Investigate the Impact of Rumble Strip on Motorcyclists
    Investigate the Impact of Rumble Strip on Motorcyclists
    Tsai, Yichang (James) ;
    Cabe, Reid
    2026-01-01 | PDF
    This research project evaluates how rumble strip design and placement affect motorcycle safety and comfort, with the goal of developing recommendations for the Georgia Department of Transportation (GDOT) to improve roadway design practices. Rumble strips are a proven countermeasure for roadway departure crashes; however, their vibration and geometr ...
  • Artificial Intelligence and Its Role and Use Within State DOTs
    Artificial Intelligence and Its Role and Use Within State DOTs
    Egge, Mark ;
    Tate, Syndney
    2026-01-01 | PDF
    Artificial Intelligence (AI) is increasingly shaping the way state Departments of Transportation (DOTs) approach both research and daily operations. This powerful technology creates new opportunities for improving efficiency, supporting decision-making, and streamlining agency workflows, but it also presents new challenges, including concerns about ...
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