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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 1001 - 1020 of 36841 results
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
  • Development of SemiIntegral Bridge Abutment Details for Texas Conditions
    Development of Semi-Integral Bridge Abutment Details for Texas Conditions
    Zornberg, Jorge G. ;
    Mofarraj, Behdad
    2025-01-01 | PDF
    Semi-integral bridges constitute a promising alternative to conventional TxDOT bridges because they eliminate the need for deck expansion joints, which may significantly reduce bridge maintenance costs and potentially result in significant savings over the bridge service life. Adopting semi-integral bridges is particularly relevant to Districts wit ...
  • Evaluating Candidate Projects for Seal Coat Stability
    Evaluating Candidate Projects for Seal Coat Stability
    Goehl, Darlene ;
    Nyamuhokya, Tito
    2025-01-01 | PDF
    With investments in seal coats exceeding $250 million annually, it is critical to apply the right treatment to the right road at the right time. Projects are typically selected based on the time since the last seal coat (an average of 7 years) with little to no testing performed to ensure that the section is a good candidate for a seal coat. The ob ...
  • Rumble Strips Fact or Fiction Brief
    Rumble Strips: Fact or Fiction [Brief]
    Asphalt Materials, Inc  ...
    2025-01-01 | PDF
    Centerline rumble strips (CLRS) significantly reduce severe head-on crashes on two lane roads, although installing CLRS in asphalt pavements may accelerate deterioration of the pavement at the longitudinal construction joint. Recent research has suggested chip sealing new rumble strips as a preventive measure; however, chip sealing immediately foll ...
  • An Integrated Online Application for SiteManager and Pavement Analyst
    An Integrated Online Application for SiteManager and Pavement Analyst
    Rahman, Syeda ;
    Bhasin, Amit
    2025-01-01 | PDF
    The objectives of this study were to integrate material, construction, maintenance, and performance information, and to deploy the unified data on a commercial system licensed by TxDOT so that Division and District personnel can access and interact with these data. Data from the SMGR, PA, and DCIS databases were identified, integrated, and processe ...
  • A New Approach to Accelerated Fabrication of Steel Bridges Design Optimization and Demonstration Summary
    A New Approach to Accelerated Fabrication of Steel Bridges: Design, Optimization, and Demonstration [Summary]
    Thrall, Ashley P
    2025-01-01 | PDF
    This research developed and demonstrated a new approach to the accelerated fabrication of resilient steel bridges—built-up press-brake formed tub girders (PBTGs). Built-up PBTGs are comprised of webs that are cold bent via a press brake and bolted to separate, flat bottom and top flanges. This investigation included (1) designing and building two d ...
  • Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer FWD and International Roughness Index IRI Brief
    Performance Acceptance and Performance Monitoring of Pavement Using Falling Weight Deflectometer (FWD) and International Roughness Index (IRI) [Brief]
    Nantung, Tommy ;
    Cho, Seong-Hwan
    2025-01-01 | PDF
    The Indiana Department of Transportation (INDOT) utilizes the International Roughness Index (IRI) and Falling Weight Deflectometer (FWD) data to prioritize pavement maintenance across interstates, state roads, and U.S. highways. While IRI measures ride quality and FWD assesses structural integrity, their threshold values vary by road type, reflecti ...
  • Proposed Design of Internally Redundant Steel Box Straddle Caps
    Proposed Design of Internally Redundant Steel Box Straddle Caps
    Zecchin, Esteban ;
    Williams, Emma
    2025-01-01 | PDF
    Steel box straddle caps are classified as Fracture Critical Members, requiring stringent design, fabrication, and in-service inspections to comply with the provisions of the Fracture Control Plan. Providing internal redundancy to steel box straddle caps to remove the Fracture Critical inspection requirements is highly desirable. The research conduc ...
  • LongTerm Statewide EV Infrastructure Plan
    Long-Term Statewide EV Infrastructure Plan
    Kraus, Edgar ;
    Kuzio, Jacqueline
    2025-01-01 | PDF
    This document is Product 0-7169-P3, Long-Term Statewide EV Infrastructure Strategic Plan, which the research team developed as part of Task 6 of Texas Department of Transportation (TxDOT) Project 0-7169, Post-NEVI Electric Vehicle Infrastructure Research (Freight, Fleet, and Multifamily Housing). The purpose of the long-term strategic plan is to gu ...
  • A Systematic Evaluation of Generative Models on Tabular Transportation Data
    A Systematic Evaluation of Generative Models on Tabular Transportation Data
    Wang, Chengen ;
    Cardenas, Alvaro A.
    2025-01-01 | PDF
    The sharing of large-scale transportation data is beneficial for transportation planning and policymaking; however, there are privacy concerns with data sharing, as it can include identifiable personal information, such as individuals’ home locations. To address these concerns, synthetic data generation based on real transportation data offers a pr ...
  • Geosyntheticstabilized Roadways for Base Course Reduction
    Geosynthetic-stabilized Roadways for Base Course Reduction
    Zornberg, Jorge G. ;
    Sankaranarayanan, Subramanian
    2025-01-01 | PDF
    This project includes the instrumentation and post-construction monitoring of pavement test sections that incorporate geogrids for base stabilization along IH10 frontage roads east of San Antonio. Specifically, and as part of a full-depth frontage road rehabilitation, the test sections were constructed with an unbound aggregate base layer stabilize ...
  • 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 ...
  • A Systemic Evaluation of Wrong Way Driving Crashes and Countermeasures on Virginia Roads
    A Systemic Evaluation of Wrong Way Driving Crashes and Countermeasures on Virginia Roads
    Cho, Hyun W. ;
    Robartes, Erin M
    2025-01-01 | PDF
    Wrong-way driving (WWD) crashes are a small percentage of all crashes but tend to be more severe. The purpose of this project was to perform a systemic evaluation of WWD incident and crash risks and identify countermeasures for Virginia’s roadways. This evaluation included assessing the magnitude of WWD crashes and WWD-related 911 calls in Virginia ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
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