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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 621 - 640 of 36841 results
  • Optimizing Work Zone Conditions to Maximize Safety and Mobility
    Optimizing Work Zone Conditions to Maximize Safety and Mobility
    Kay, Jonathan J. ;
    Gates, Timothy J.
    2025-07-25 | PDF
    Despite the fact that highway work zones represent a required element of maintaining and improving the transportation network, the resulting changes in traffic patterns, narrowed right-of-way, and other construction activities can lead to an increased risk for traffic crashes and related injuries or fatalities. This research sought to identify the ...
  • The Economic Impact of a SalisburytoAsheville Rail Corridor
    The Economic Impact of a Salisbury-to-Asheville Rail Corridor
    Bert, Steve ;
    Hassett, Ryan
    2025-07-18 | PDF
    Reestablishing passenger rail service between Salisbury and Asheville presents a significant opportunity to strengthen North Carolina’s economy and transportation network. By connecting major population centers—including the Charlotte metro, the Piedmont Triad, the Research Triangle, and the Blue Ridge region—the corridor would enhance mobility for ...
  • Practical Implementation of Superabsorbent Polymers SAP for Internally Cured Concrete
    Practical Implementation of Superabsorbent Polymers (SAP) for Internally Cured Concrete
    Ajuonuma, Chibueze ;
    Tokpatayeva, Raikhan
    2025-07-17 | PDF
    Laboratory investigations and results from a year-long field trial demonstrated that plain Type IL cement and slag cement concrete that was internally cured by superabsorbent polymer (SAP) has increased strength and durability compared to SAP-free mixtures, mixtures containing colloidal nanosilica, and mixtures that were externally cured with a sur ...
  • Roadside RightofWay Maintenance Strategies
    Roadside Right-of-Way Maintenance Strategies
    Daniels, Cheryl ;
    Burdell, Angela
    2025-07-17 | PDF
    The Indiana Department of Transportation's (INDOT) roadside management program is tasked with multiple items across the state's 39,000 lane miles. Roadside maintenance is an essential task that keeps INDOT's rights-of-way (ROWs) safe and functional for drivers. Most roadside vegetation maintenance work for INDOT is outsourced, and INDOT's in-house ...
  • Backcalculated Dynamic Modulus Master Curve From the Time Histories of Falling Weight Deflectometer Surface Deflections
    Backcalculated Dynamic Modulus Master Curve From the Time Histories of Falling Weight Deflectometer Surface Deflections
    Notani, Mohammad Ali ;
    Cho, Seonghwan
    2025-07-14 | PDF
    Accurate structural evaluation of flexible pavements is important for cost-efficient maintenance and rehabilitation (M&R) strategies. Traditional back-calculation methods based on Falling Weight Deflectometer (FWD) data assume elastic behavior, overlooking the viscoelastic nature of asphalt materials and subsequently leading to inaccuracies. This s ...
  • Performance Index Rating and Maintenance Cost Assignment for Ramps Acceleration Lanes and Deceleration Lanes in Louisiana Technical Summary
    Performance Index Rating and Maintenance Cost Assignment for Ramps, Acceleration Lanes, and Deceleration Lanes in Louisiana [Technical Summary]
    Liu, Jun
    2025-07-01 | PDF
    Conventional high-speed inertial profilers provide valid international roughness index (IRI) measurements under favorable conditions but experience performance degradation at low speeds, during deceleration and acceleration, or when coming to a stop. Due to these limitations, Louisiana DOTD does not compute performance index (PI) values for certain ...
  • Estimating HCM Default Parameters for Louisiana Summary
    Estimating HCM Default Parameters for Louisiana [Summary]
    Rahman, M. Ashifur
    2025-07-01 | PDF
    Intersection capacity, defined as the maximum number of vehicles that can pass through an intersection within a given time, directly influences traffic flow, congestion levels, and overall network efficiency. Accurate estimation of intersection capacity is essential for effective roadway planning, design, operation, and management. Intersection cap ...
  • Geotechnical Database Phase IV Summary
    Geotechnical Database - Phase IV [Summary]
    Gautreau, Gavin P.
    2025-07-01 | PDF
    This research project expanded on the three previous LTRC geotechnical database efforts to improve and advance geotechnical data management within the Louisiana Department of Transportation and Development. This project facilitated the implementation of Bentley’s OpenGround Cloud (OpenGround). The project uploaded historical boring log images and d ...
  • Utilizing Recycled Tires to Treat Stormwater Research Summary
    Utilizing Recycled Tires to Treat Stormwater [Research Summary]
    Gulliver, John S. ;
    Hansen, Mark
    2025-07-01 | PDF
    The objective of this research was to determine the efficacy and cost-effectiveness of the application of tire-derived aggregate (TDA) in stormwater treatment and management systems. We reaffirmed that TDA is an excellent means of retaining phosphate (soluble reactive phosphorus) in stormwater runoff. In addition, we found that biofilms grow on TDA ...
  • Bond vs PayGo
    Bond vs. Pay-Go
    Glover, Brianne A ;
    Steadman, Maxwell P.
    2025-07-01 | PDF
    This research examines the value of financing infrastructure improvements through bonding versus a program of pay-go improvements. Postponed construction becomes more costly in nominal terms because inflation raises the cost of construction over a longer period before construction begins. However, postponements can also create a variety of other si ...
  • Development of Biochar Specification Criteria as Soil Amendment for Slopes Conveyances and Stormwater Treatment Systems Phase 1
    Development of Biochar Specification Criteria as Soil Amendment for Slopes, Conveyances and Stormwater Treatment Systems (Phase 1)
    Barry, Brian ;
    Haile, Tadele
    2025-07-01 | PDF
    The objective of this project is to develop knowledge, tools, and protocols to inform best practice standards for effective implementation of biochar in bioretention systems (BRSs) for treating roadway runoff. This project will be performed in two phases, with the first phase (this report) focusing on biochar production, characterization, and conta ...
  • Countermeasures for HighRisk Locations for Wildlife Related Crashes in Tennessee
    Countermeasures for High-Risk Locations for Wildlife Related Crashes in Tennessee
    Waldron, Brian ;
    Butler, Rebecca
    2025-07-01 | PDF
    A study funded by the Tennessee Department of Transportation (TDOT) and the Federal Highway Administration under RES2024-003 was conducted to assess the occurrence of wildlife-vehicle crashes (WVCs) along TDOT maintained routes in Tennessee and to explore potential mitigation strategies. WVC hotspots were identified by analyzing wildlife incident d ...
  • Comprehensive Field Load Test and Geotechnical Investigation Program for Development of LRFD Recommendations of Driven Piles on Intermediate Geomaterials
    Comprehensive Field Load Test and Geotechnical Investigation Program for Development of LRFD Recommendations of Driven Piles on Intermediate Geomaterials
    Ng, Kam W. ;
    Masud, Nafis Bin
    2025-07-01 | PDF
    Pile foundations were often driven into intermediate geomaterials (IGM) to support heavy civil infrastructures like bridges due to shallow bedrock stratigraphy. Thus, the pile foundations of this region must rely on the resistance contributed from the IGM layers. However, IGM is a transitional geomaterial between soil and rock, that needs to be bet ...
  • Develop an Interactive Unit Price Estimation and Visualization Tool Final Report
    Develop an Interactive Unit Price Estimation and Visualization Tool: Final Report
    Shahandashti, Mohsen ;
    Yasar, Mahmut
    2025-07-01 | PDF
    Texas Department of Transportation (TxDOT) determines unit prices of pay items using the historical bids-based estimation method and then develops an engineer’s project appraisal. The engineer's estimate is used to assess the bids and select the bidder. However, the unit price of a work item is heavily affected by various project-specific and exter ...
  • Stabilizing Embankments Using Geosynthetic Reinforcement
    Stabilizing Embankments Using Geosynthetic Reinforcement
    Greer, Daryl J. ;
    Sun, Charlie
    2025-07-01 | PDF
    Reinforced soil slopes (RSSs) can be a feasible solution for embankments where there exist right of way restrictions, environmental issues, rolling or mountainous topography, unfavorable geology, and other limiting fac-tors. They can be an alternative to retaining walls or importing select fills to construct steeper, stable embankment slopes where ...
  • Pavement Preservation Demonstration Projects for Chip Seal and Microsurfacing Treatments
    Pavement Preservation Demonstration Projects for Chip Seal and Microsurfacing Treatments
    Boz, Ilker ;
    Nair, Harikrishnan
    2025-07-01 | PDF
    In 2021, the Virginia Department of Transportation (VDOT) collaborated with the National Cooperative Highway Research Program (NCHRP 20-44(26)) project research team to develop three specifications for chip seals, microsurfacing, and fog seals, incorporating recommendations from guidelines developed under the NCHRP 14-37 project and American Associ ...
  • Characterization of Key Asphalt Mixtures for AASHTOware PavementME Design
    Characterization of Key Asphalt Mixtures for AASHTOware Pavement-ME Design
    Bowers, Benjamin F. ;
    Timm, David H.
    2025-07-01 | PDF
    The Alabama Department of Transportation (ALDOT) is currently using the Alabama Design and Analysis of Pavement Thickness (ADAPT) software for their structural pavement design process, which is based on the 1993 American Association of State Highway and Transportation Officials (AASHTO) Pavement Design Guide. In 2008, the American Association of St ...
  • Development of an Unmanned Aircraft Systems Training Program for the Utah Department of Transportation
    Development of an Unmanned Aircraft Systems Training Program for the Utah Department of Transportation
    Conley, Riley ;
    Fiorello, Dominick
    2025-07-01 | PDF
    This research was completed to provide recommendations to create a standardized operational framework or pilot training program for Utah Department of Transportation (UDOT) Unmanned Aircraft Systems (UAS) which are used for infrastructure inspections, traffic monitoring, emergency response, and data collection. This will improve safety practices, r ...
  • Roundabouts A Minnesota Guide for Pedestrians and Cyclists
    Roundabouts: A Minnesota Guide for Pedestrians and Cyclists
    Minnesota. Department of Transportation. Local Road Research Board
    2025-07-01 | PDF
    This brochure is part of the final deliverable for 2025RIC11.
  • A Review of Data Systems to Track ZeroEmission Truck Adoption and Suggestions for Future Improvements
    A Review of Data Systems to Track Zero-Emission Truck Adoption and Suggestions for Future Improvements
    Miller, Marshall R ;
    Fulton, Lewis M
    2025-07-01 | PDF
    To guide databases that track progress on the uptake and use of zero emission trucks and buses, this project identified types of data that should be collected on a regular basis and compiled in a repository, preferably with public access. Funding will need to be identified to support this effort on an on-going basis. Data recommended for collection ...
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