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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 181 - 200 of 36336 results
  • Project Development and Utility Coordination as a Partnership Tech Transfer Summary
    Project Development and Utility Coordination as a Partnership [Tech Transfer Summary]
    Sturgill, Roy
    ORCID ICON IMG
    2025-12-01 | PDF
    The primary purpose of this research was to develop and propose procedures for incorporating partnerships with utility stakeholders into the early stages of the project development process at the Iowa Department of Transportation (Iowa DOT), with the broader goal of streamlining workflows to reduce utility-related delays and cost overruns.
  • Concentration Preserving Deicing Solutions for Higher Ice Melting
    Concentration Preserving Deicing Solutions for Higher Ice Melting
    Yellavajjala, Ravi Kiran ;
    Afgan, Sher
    2025-12-01 | PDF
    Chloride-based brine deicers are widely used to maintain winter roadway safety, but their performance drops in extreme cold as meltwater dilutes the brine, and their runoff accelerates concrete deterioration, rebar corrosion, and ecological harm. This report investigates sustainable, high-performance deicing formulations that enhance low-temperatur ...
  • Nonmotorist Crashes in the 2024 Crash Investigation Sampling System Traffic Safety Facts
    Nonmotorist Crashes in the 2024 Crash Investigation Sampling System [Traffic Safety Facts]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2025-12-01 | Traffic Safety Facts | PDF
    In 2024 NHTSA began upgrading the Crash Investigation Sampling System (CISS) with provisions in the Infrastructure Investment and Jobs Act (IIJA), which said “to enhance the collection of crash data by upgrading the [CISS] to include – 1) additional data collection sites; 2) an expanded scope that includes all crash types; and 3) on-scene investiga ...
  • The Effect of Nighttime Lighting Systems on Workers Visibility and Safety
    The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety
    Ho, Chun-Hsing ;
    Kim, Kyungki
    2025-12-01 | PDF
    Nighttime work zones pose increased risks for both drivers and workers due to the challenge of ensuring adequate visibility while minimizing glare. Current lighting practices vary widely across public agencies, often resulting in excessive illumination and poor glare control. This study evaluated the performance of nighttime lighting systems throug ...
  • The Effect of Nighttime Lighting Systems on Workers Visibility and Safety Tech Transfer Summary
    The Effect of Nighttime Lighting Systems on Workers’ Visibility and Safety [Tech Transfer Summary]
    Ho, Chun-Hsing ;
    Kim, Kyungki
    2025-12-01 | PDF
    This objectives of this project were as follows: •Investigate how the characteristics of lighting—specifically glare, luminance, and visibility—affect the visual performance of construction workers. •Examine the influence of lighting arrangements (i.e., the orientation and positioning of light towers) on the perceptions of both construction workers ...
  • Project Development and Utility Coordination as a Partnership
    Project Development and Utility Coordination as a Partnership
    Sturgill, Roy E. ;
    Victorio, Shani A. Montes
    2025-12-01 | PDF
    Utility relocation at the Iowa Department of Transportation (Iowa DOT) is frequently cited as a cause of construction delays and increased highway project costs. This research aimed to enhance alignment between the utility coordination and project development processes by providing recommendations for integrating utility stakeholder partnerships ea ...
  • Idaho Alive at 25 Young Driver Education Program Evaluation
    Idaho Alive at 25 Young Driver Education Program Evaluation
    May, Matthew ;
    McGinnis-Brown, Lantz
    2025-12-01 | PDF
    Since 2009, the Idaho Transportation Department (ITD) has implemented the Alive at 25 national program in Idaho. Each year, thousands of young Idaho drivers participate in the program to learn how to be better and safer on the road. To date, the impact of this program on driver behaviors and attitudes is unknown. ITD contracted Boise State Universi ...
  • Marketing and Education Budget for Implementation of New Transit Technology Guidebook
    Marketing and Education Budget for Implementation of New Transit Technology [Guidebook]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Marketing and Education Budget for Implementation of New Transit Technology Report
    Marketing and Education Budget for Implementation of New Transit Technology [Report]
    Ketterl, Mona ;
    Dutta, Utpal
    2025-11-30 | PDF
    Michigan’s public transit agencies face increasing challenges in adopting new technologies due to limited funding, staffing constraints, and varying technical capacity. The purpose of this project was to identify practical strategies to support the planning, marketing, and implementation of new transit technologies across Michigan. The research met ...
  • Comprehensive Study on the Behavior of Steel Girder Bridges
    Comprehensive Study on the Behavior of Steel Girder Bridges
    Masoudi, Mohammad Javad ;
    Song, Wei
    2025-11-30 | PDF
    This research investigates the impact of cross-frame detailing on the behavior of horizontally curved and skewed steel I-girder bridges. An analysis procedure based on three-dimensional (3D) finite element (FE) method is developed to accurately capture the complex behavior of steel girder bridges with various cross-frame detailing methods. By follo ...
  • Barrier Striping for the Reduction of Accidents Project Summary Report
    Barrier Striping for the Reduction of Accidents [Project Summary Report]
    Kutela, Boniphace ;
    Geedipally, Srinivas
    2025-11-30 | PDF
    The research team reviewed past practices for barrier delineation and evaluated barrier striping at several locations in Texas. Five existing sites with barrier striping were analyzed using crash data. In addition, striping was installed at a high-crash location for before-and-after evaluation. The study considered crash history, roadway and traffi ...
  • Autonomous Drone Prototype for Bridge Inspection and Maintenance
    Autonomous Drone Prototype for Bridge Inspection and Maintenance
    Su,Gaofeng ;
    Yang, Teaya
    2025-11-30 | PDF
    This report presents a comprehensive pipeline for the autonomous visual inspection of bridges using drones. It details the architecture of a vision-based autonomous flight stack designed for operation without GPS, alongside the design of the custom drone prototype. The system’s performance is validated through three flight tests, including deployme ...
  • Framework and Methodology for RiskBased Bridge and Tunnel Asset Management RiskBased Asset Ranking and Corridor Prioritization
    Framework and Methodology for Risk-Based Bridge and Tunnel Asset Management: Risk-Based Asset Ranking and Corridor Prioritization
    Yang, David Y. ;
    Khosravifar, Arash
    2025-11-10 | PDF
    This report presents the results of Phase II of the project, "Framework and Methodology for Risk-based Bridge and Tunnel Asset Management". The research was carried out at Portland State University in collaboration with engineers and officials at the Oregon Department of Transportation (ODOT) and Federal Highway Administration (FHWA). Using the fra ...
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    Experimental Investigation of Development Length Required for Large-Diameter Headed Reinforcing Bars in Tension
    Asgharpour, Naveed ;
    Raman, Rahul
    2025-11-10 | PDF
    The study presented in this report was to investigate the anchorage capacities of No. 14 and No. 18 headed bars, including the influence of the embedment length, concrete strength, head size, parallel tie reinforcement, and bar group on the anchorage strength, and evaluate the applicability of the development length requirements for No. 11 or small ...
  • Review and Evaluation of Concrete Pavement Design Method in Alabama
    Review and Evaluation of Concrete Pavement Design Method in Alabama
    Wu, Shenghua ;
    Kang, Min-wook
    2025-11-07 | PDF
    Concrete pavements constitute only about 2% of Alabama’s highway system, yet they provide durable and low-maintenance performance capable of handling heavy traffic and environmental challenges. The Alabama Department of Transportation (ALDOT) currently utilizes the AASHTO 1993 design guide, which, while reliable, often produces conservative and ove ...
  • Research Support to INDOT on I465 Southeast Variable Speed Limit and Ramp Meter Project
    Research Support to INDOT on I-465 Southeast Variable Speed Limit and Ramp Meter Project
    Desai, Jairaj C. ;
    Gartner, Christopher
    2025-11-07 | PDF
    Traditionally, crash data, crash risk models, video recordings and user surveys have been utilized by agencies to measure the safety benefits of ramp metering technology. Connected vehicle data can now provide an agile evaluation alternative for quantifying impact of ramp meter deployments. Furthermore, in contrast to crash data, connected vehicle ...
  • Worksite Speed Control System WSCS
    Worksite Speed Control System (WSCS)
    Desai, Jairaj C. ;
    Sakhare, Rahul Suryakant
    2025-11-07 | PDF
    This study evaluates the effectiveness of Speed Safety Camera (SSC) deployments in reducing traffic speeds through four interstate work zones in Indiana in accordance with Indiana State Law House Enrolled Act (HEA) 1015. The initial deployment of SSC was along interstate I-70 in August 2024, with deployments on I-69, I-465, and I-65 subsequently fo ...
  • Continued Deployment of Indiana Work Zone Analytics
    Continued Deployment of Indiana Work Zone Analytics
    Overall, Myles W. ;
    Mukai, Justin
    2025-11-07 | PDF
    Work zones along interstates often have increased congestion and crash rates when locations are close to or over capacity. Having agile monitoring methods to identifying emerging issues and challenges can provide data to transportation agency decision makers to refine maintenance of traffic plans and inform future designs. This study developed tech ...
  • Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Enhancing ADOT Communications to Reduce Highway Litter in Arizona
    Washburn, Lauren C. ;
    O’Callaghan, Nicholas
    2025-11-04 | PDF
    This report summarizes a statewide study commissioned by the Arizona Department of Transportation (ADOT) to inform and enhance anti-litter communications and operational litter remediation practices as they pertain to the Arizona state highway system. The project team conducted communications research, developed a highway visible litter characteriz ...
  • Evaluating the Virginia Department of Transportations Potential Use of Electric Pickup Trucks Using Field Test Data supplemental file
    Evaluating the Virginia Department of Transportation’s Potential Use of Electric Pickup Trucks Using Field Test Data [supplemental file]
    Virginia Transportation Research Council (VTRC)
    2025-11-01 | XLSX
    This Excel Spreadsheet contains the Electric Vehicle Decision Support Tool: The life cycle cost analysis tool allows for a life cycle cost analysis comparison of multiple vehicles, including electric vehicles (EV), hybrid electric vehicles (HEV), and internal combustion engine vehicles (ICEV). The tool requires inputs about how the vehicle will be ...
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