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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 421 - 440 of 35440 results
  • Rebalancing Contracting Terms to Ensure Success for the GDOTs Alternative Delivery Projects and Better Reflect RealTime Market Conditions
    Rebalancing Contracting Terms to Ensure Success for the GDOT’s Alternative Delivery Projects and Better Reflect Real-Time Market Conditions
    Ashuri, Baabak ;
    Kingsley, Gordon
    2025-01-01 | PDF
    The primary objective of this research is to assist GDOT in its efforts to enhance competition in the Georgia transportation infrastructure market through rebalancing contracting terms and conditions. Rebalancing contracting terms may enable GDOT to manage alternative delivery projects in response to real-time market conditions rather than historic ...
  • PostLet Environmental Analysis and Permitting for Alternative Delivery Projects
    Post-Let Environmental Analysis and Permitting for Alternative Delivery Projects
    Kingsley, Gordon ;
    Ashuri, Baabak
    2025-01-01 | PDF
    This report presents a guidebook for the management of environmental risk in the post-let phases of alternative delivery projects. Common challenges to environmental analysis and permitting are presented, in addition to a series of best practices and opportunities to promote efficient outcomes within the context of public-private partnerships, incl ...
  • Experimental Tests for an Effective Barrier Design to Exclude Diamondback Terrapins Malaclemys terrapin from Roads
    Experimental Tests for an Effective Barrier Design to Exclude Diamondback Terrapins (Malaclemys terrapin) from Roads
    Andrews, Kimberly M ;
    Crossman, Abbey C
    2025-01-01 | PDF
    The objective of this project was to conduct experimental testing on fence designs that are effective in preventing diamondback terrapins (Malaclemys terrapin) from entering roadways to prevent the species from being impacted by road mortality. The diamondback terrapin is listed as a State Species of Concern in the State of Georgia. They are the on ...
  • Development of NextGen Texas Bridge Decks
    Development of NextGen Texas Bridge Decks
    Wang, Hwa-Ching ;
    Reed, Aidan
    2025-01-01 | PDF
    Project 0-7041 represents a significant endeavor aimed at developing the NextGen Texas Bridge Deck system. Utilizing panel pairs reinforced with wire trusses, the need of bracket-supported deck overhangs is expected to be eliminated, which will reduce construction time and effort. Through a comprehensive research approach encompassing experimental ...
  • Supplemental Data Collection and Processing for Bridge Safety Inspections Utilizing Mixed Reality and Artificial Intelligence
    Supplemental Data Collection and Processing for Bridge Safety Inspections Utilizing Mixed Reality and Artificial Intelligence
    Sarlo, Rodrigo ;
    Gabbard, Joseph
    2025-01-01 | PDF
    This research work focused on evaluating both the technical and design elements necessary to perform augmented reality (AR) assisted bridge inspections. The inspection prototype developed by this project aims to demonstrate the potential benefits and limitations of incorporating head-worn displays into the inspection workflow. By virtue of switchin ...
  • Supporting Transportation System Management and Operations Using Internet of Things Technology Phase II Field Tests
    Supporting Transportation System Management and Operations Using Internet of Things Technology: Phase II Field Tests
    Yang, Hong ;
    Cetin, Mecit
    2025-01-01 | PDF
    This Phase II report builds on Phase I findings, further examining the application of the Low Power Wide Area Network (LPWAN) technologies in supporting transportation system operations and management. Phase I included a literature review to understand the current state of LPWAN applications and an online survey targeting transportation professiona ...
  • Trip Generation Study for Coffee Shop with DriveThrough and FastFood with DriveThrough Summary
    Trip Generation Study for Coffee Shop with Drive-Through and Fast-Food with Drive-Through [Summary]
    Bonyani, Gina ;
    Roark, Drew
    2025-01-01 | PDF
    This research focused on two main objectives: (1) to analyze trip generation rates and queuing behavior at drive-through establishments and (2) to assess the accuracy of traditional estimation methods, such as the Institute of Transportation Engineers (ITE) Trip Generation Manual. Ultimately, the study aimed to develop improved models and recommend ...
  • Operational and Safety Effects of the I95 Variable Speed Limit System in Fredericksburg Virginia
    Operational and Safety Effects of the I–95 Variable Speed Limit System in Fredericksburg, Virginia
    Cho, Hyun W. ;
    Robartes, Erin M
    2025-01-01 | PDF
    Variable speed limit (VSL) systems have been broadly deployed to address safety and mobility concerns both in the United States and internationally. In June 2022, the Virginia Department of Transportation (VDOT) activated a VSL system on I–95 northbound about halfway between Washington, D.C., and Richmond, VA. This section of I–95 experiences high ...
  • OSTR Research Roundup January 2025
    OST-R Research Roundup: January 2025
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2025-01-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Evaluating and Validating Technology Options for Estimating Transit Vehicle Occupancy in Real Time Summary
    Evaluating and Validating Technology Options for Estimating Transit Vehicle Occupancy in Real Time [Summary]
    Sun, Yanshou ;
    Matthews, Gabrielle
    2025-01-01 | PDF
    The objective of this project was to identify and compare suitable technologies that could provide cost-effective and reliable information about occupancy levels. The team assessed numerous technologies, including Wi-Fi, Bluetooth, infrared sensors, cameras, and crowd-sourced data.
  • MD 210 Before and After Case Study for Speed Management Practices Research Summary
    MD 210 Before and After Case Study for Speed Management Practices [Research Summary]
    Franz, Mark L.
    2025-01-01 | PDF
    The goal of this project was to develop a robust and rigorous before/after analysis framework for traffic safety interventions. In addition to analyzing traditional traffic data sources such as vehicle probe data and crash data, this study explored the use of Michelin event data to gain deeper insights into the safety performance of MD 210.
  • Determine the Feasibility and Methodologies of Using Structural Data from the Traffic Speed Deflectometer in Network and ProjectLevel Treatment DecisionMaking
    Determine the Feasibility and Methodologies of Using Structural Data from the Traffic Speed Deflectometer in Network- and Project-Level Treatment Decision-Making
    Scullion, Tom ;
    Dorsett, Garrett
    2025-01-01 | PDF
    The traffic speed deflectometer (TSD) offers TxDOT a highway-speed, nondestructive testing tool, which can significantly assist TxDOT districts with development of their four-year plans. In this project, the TSD was initially compared to the deflections measured by the falling weight deflectometer (FWD). Good correlation was observed in the maximum ...
  • Best Practices for the Use of Prime in Texas Pavement Structures
    Best Practices for the Use of Prime in Texas Pavement Structures
    Goehl, Darlene ;
    Sebesta, Stephen
    2025-01-01 | PDF
    The objective of this research project was to determine where, when, and why a prime or cure is needed for a pavement layer. Materials such as prime coats, curing materials, seal coats, and tack coats are typically considered nonstructural but integral to the pavement structure. Some materials can be used for multiple purposes, such as to prime, bo ...
  • Feasibility of a Traffic Operations Center for South Dakota
    Feasibility of a Traffic Operations Center for South Dakota
    Bittner, Mike ;
    Hvizdos, Kate
    2025-01-01 | PDF
    The South Dakota Department of Transportation (SDDOT) is pursuing a statewide Traffic Operations Center (TOC) to improve transportation on its roadways. The effort required to establish a TOC is significant; thus, the SDDOT commissioned a feasibility study and report. The project gathered stakeholder input, performed research on nationwide practice ...
  • Assessing the Asset Management Programs of Locals Bridges and Pavement Conditions
    Assessing the Asset Management Programs of Locals: Bridges and Pavement Conditions
    Ajagu, Richard ;
    Song, Dongyoon
    2025-01-01 | PDF
    Indiana’s 2016 House Enrolled Act (HEA) 1001 provided a funding mechanism for transportation infrastructure that required Local Public Agencies (LPAs) to have an Asset Management Plan (AMP) to be eligible for funding. In 2022, the Indiana General Assembly desired to know the extent to which LPAs had adopted AMPs in response to this legislation. Thi ...
  • Ensuring Fair and Equitable Funding of Rural Transit in Georgia after the 2020 Census
    Ensuring Fair and Equitable Funding of Rural Transit in Georgia after the 2020 Census
    Garrow, Laurie A. ;
    Guhathakurta, Subhrajit
    2025-01-01 | PDF
    Rural public transit systems are typically small, demand-responsive systems. Revenues are generally not sufficient to cover the system’s costs, and the Federal Transit Administration (FTA) § 5311 program provides capital, planning, and operating assistance in support of these systems. State departments of transportation (DOTs) are responsible for d ...
  • An Innovative Practical Approach to Assessing Bitumen Compatibility as a Means of Material Specification
    An Innovative Practical Approach to Assessing Bitumen Compatibility as a Means of Material Specification
    Dave, Eshan V. ;
    Sias, Jo E.
    2025-01-01 | PDF
    Modern asphalt mixtures are usually a combination of various materials from different sources, including reclaimed asphalt pavement (RAP) and recycling agents (RAs), and are used to attain sustainable growth. However, the lack of a well-established method for determining compatibility between various sources and types of virgin binder, aged binder ...
  • Feasibility of Vertiport Siting and Land Use Planning A Guide for the Process of Planning UAVUAM Vertiport Locations
    Feasibility of Vertiport Siting and Land Use Planning: A Guide for the Process of Planning UAV/UAM Vertiport Locations
    Chamberlain, Brent ;
    Samavatekbatan, Ames
    2025-01-01 | PDF
    Vertiports represent an innovative approach to integrating aviation into municipal transportation networks. This guidebook is intended to aid communities in strategically planning vertiports by overseeing land planning processes, offering recommendations for incorporating vertiports into land plans, and detailing how to conduct site evaluations, in ...
  • Implementation of Balanced Mixture Design in Missouri Test Sections with Modifiers
    Implementation of Balanced Mixture Design in Missouri Test Sections with Modifiers
    Buttlar, William G. ;
    Rath, Punyaslok
    2025-01-01 | PDF
    The overarching goal of this study was to advance the deployment of innovative pavement technologies prevalent in the state of Missouri. In this study, the focus was on evaluating recycled polymers for use in asphalt mixtures and Balanced Mixture Design (BMD) implementation. Nine test sections were constructed on I-155 near Hayti, MO. Six sections ...
  • Implementation of Balanced Mixture Design in Missouri Test Sections with Modifiers Summary
    Implementation of Balanced Mixture Design in Missouri Test Sections with Modifiers [Summary]
    Buttlar, William G.
    2025-01-01 | PDF
    The overarching goal of this study was to advance the deployment of innovative pavement technologies prevalent in the state of Missouri. In this study, the focus was on evaluating recycled polymers for use in asphalt mixtures and Balanced Mixture Design (BMD) implementation. Nine test sections were constructed on I-155 near Hayti, MO. Six sections ...
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