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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 141 - 160 of 35412 results
  • 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 ...
  • Geotechnical Database Phase IV
    Geotechnical Database - Phase IV
    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 ...
  • 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 ...
  • A Framework for Field Inspection of Inservice FRP ReinforcedStrengthened Concrete Bridge Elements Technical Summary
    A Framework for Field Inspection of In-service FRP Reinforced/Strengthened Concrete Bridge Elements: Technical Summary
    Mehrabi, Armin ;
    Dolati, Seyed Saman Khedmatgozar
    2025-07-01 | PDF
    This document is a technical summary and supplement to the Florida International University report, A Framework for Field Inspection of In-Service FRP Reinforced/Strengthened Concrete Bridge Elements (FIU- 800014727), available at https://rosap.ntl.bts.gov/view/dot/73333. The document additionally offers technical findings beyond those provided in ...
  • Impact of Pavement Friction on Traffic Safety Phase 1 Pavement Friction Evaluation
    Impact of Pavement Friction on Traffic Safety, Phase 1: Pavement Friction Evaluation
    Smadi, Omar G. ;
    Alhasan, Ahmad
    2025-07-01 | PDF
    The primary objectives of the proposed study are listed below: (1) To identify the possible procedures and a list of candidate continuous friction measurement equipment (CFME) technologies to evaluate pavement friction at different test speeds and operational conditions. (2) To assess the feasibility and possible benefits from the list of candidate ...
  • 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 ...
  • Smart Selection of Cutting Edges A Practical Guide for Minnesotas Cities and Counties
    Smart Selection of Cutting Edges: A Practical Guide for Minnesota’s Cities and Counties
    Minnesota Local Road Research Board
    2025-07-01 | PDF
    This guide equips public agencies with considerations to select, use, and evaluate cutting edges that deliver the best return on investment. Choosing the right cutting edge for snowplowing or blading gravel roadways is essential to maximize performance, reduce costs, and protect both roads and operators. The best blade depends on surface type, plow ...
  • An Economical and Sustainable Dust Suppressant for Gravel Roads
    An Economical and Sustainable Dust Suppressant for Gravel Roads
    Yellavajjala, Ravi Kiran ;
    Hesami, Maedeh
    2025-07-01 | PDF
    Air pollution from fugitive dust poses a significant health risk to the population in rural and arid regions. Conventional chloride-based suppressants offer temporary dust control, leading to soil contamination and infrastructure corrosion. This study proposes the synthesis of a starch-based powder that regenerates into a hydrogel for dust mitigati ...
  • Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings
    Select High Risk Pedestrian Midblock Crossings and Perform Safety Evaluations for Developing Pedestrian Crossings
    Sharif, Hatim O. ;
    Joseph, John
    2025-07-01 | PDF
    Pedestrian fatalities on high-speed, multi-lane roads in Texas, particularly in San Antonio, Houston, and Dallas, highlight an urgent need for focused interventions at midblock crossings. These sites often serve vulnerable populations and connect neighborhoods to transit, retail, and essential services, yet their safety challenges are magnified by ...
  • Deck Reinforcement Detailing and Concrete Mix Additives to Reduce Bridge Deck Cracking
    Deck Reinforcement Detailing and Concrete Mix Additives to Reduce Bridge Deck Cracking
    Hedegaard, Brock D. ;
    Gibson, Eric
    2025-07-01 | PDF
    Despite recent changes to MnDOT mix designs, transverse cracking has still been observed shortly after the bridge deck is poured. The goal of this research was to determine the causes of this cracking and to propose deck reinforcement or mix design practices that efficiently mitigate the problem. Initial investigations focused on synthesizing exist ...
  • Project Summary Heath Creek Truck Parking
    Project Summary: Heath Creek Truck Parking
    Minnesota. Department of Transportation
    2025-07-01 | PDF
    Truckers often struggle to find parking to take legally required breaks, which is not only an inconvenience for drivers, but also poses a safety risk for the motoring public. MnDOT is testing a detection system to identify the number of available truck parking spaces at the Heath Creek Rest Area (Northbound) located at M.P. 68.1 North of Faribault ...
  • 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 ...
  • 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.
  • Return on Investment for Rural DemandResponse Transit in Illinois
    Return on Investment for Rural Demand-Response Transit in Illinois
    Sriraj, P S ;
    Jang, Jin
    2025-07-01 | PDF
    Transit is frequently treated as a financial burden rather than a public investment, where the value is assessed primarily in terms of ridership or farebox recovery. This framing misses a wide range of external benefits, including workforce participation, healthcare access, and local economic activity. Additionally, public discourse and scholarly r ...
  • Develop Design Details for CRCP Whitetopping and Unbonded Overlays
    Develop Design Details for CRCP Whitetopping and Unbonded Overlays
    Koirala, Niwesh ;
    Jabonero, Christopher
    2025-07-01 | PDF
    Existing design methodologies for concrete overlays often rely on outdated empirical approaches or complex mechanistic models that lack adequate field validation. This has resulted in a significant gap in practice, particularly the design of Continuously Reinforced Concrete Pavement (CRCP) overlays, for which no standardized procedure exists in man ...
  • NPS National Transit Inventory and Performance Report 2024
    NPS National Transit Inventory and Performance Report, 2024
    United States. Department of the Interior. National Park Service. Washington Area Support Office
    2025-07-01 | PDF
    The 2024 NPS Transit Inventory and Performance Report communicates the service-wide outcomes and status of National Park Service (NPS) transit systems. This comprehensive listing has been compiled annually in this format since 2012 and covers on- and off-road, waterborne, and airborne systems. The inventory establishes a working definition of NPS t ...
  • 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 ...
  • 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 ...
  • Unmanned Aircraft Systems Communication Mesh Test Deployment
    Unmanned Aircraft Systems Communication Mesh Test Deployment
    Wheeler, Paul ;
    Organ, Aaron
    2025-07-01 | PDF
    The purpose of the Michigan Department of Transportation (MDOT) Unmanned Aircraft Systems (UAS) Communications Mesh Test Deployment project was to evaluate the feasibility of using short-range wireless mesh networks to support Beyond Visual Line of Sight (BVLOS) operations for UAS. The project focused on integrating Dedicated Short-Range Communicat ...
  • Evaluation Of Concrete Bridge Deck Mixtures Using ShrinkageRing Tests
    Evaluation Of Concrete Bridge Deck Mixtures Using Shrinkage-Ring Tests
    Perez Buenfil, Shamel ;
    Higgins, John
    2025-07-01 | PDF
    The durability of concrete structures is dependent on the restrained shrinkage behavior of the mix: therefore, evaluating mixtures with different aggregates and mitigation measures is critical. The aim of this document is to evaluate and compare concrete mixture designs using granite and limestone aggregates in combination with different mitigation ...
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