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US Transportation Collection

rosaP Repository & Open Science Access Portal

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 221 - 240 of 35753 results
  • Development and Use of UltraHighPerformance Concrete UHPC as a High Friction Surface Treatment HFST on Pavements and Bridges
    Development and Use of Ultra-High-Performance Concrete (UHPC) as a High Friction Surface Treatment (HFST) on Pavements and Bridges
    Rangaraju, Prasad ;
    Maeger, Kyle
    2025-07-01 | PDF
    High Friction Surface Treatments (HFST) are proven crash reduction technology. However, their high cost necessitates exploring the use of alternative materials. This study assessed the design and application of Ultra-High-Performance Concrete (UHPC) as an alternative to traditional epoxy resin-based binder for HFST. In addition, the use of local al ...
  • 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 ...
  • Crash Modification Factors for Super 2 Highways
    Crash Modification Factors for Super 2 Highways
    Brewer, Marcus A. ;
    Geedipally, Srinivas R.
    2025-07-01 | PDF
    Super 2 highways have been used across Texas for over 20 years, providing operational and safety benefits to rural two-lane highways at a lower cost than widening such facilities to four lanes. More Super 2 highways are planned as the demand increases on the state highway system. Previous research has provided insights on Super 2 safety, but update ...
  • GFRP Reinforced Bridge Barriers Impact Experiment Summary
    GFRP Reinforced Bridge Barriers: Impact Experiment [Summary]
    Wu, Chenglin
    ORCID ICON IMG
    2025-07-01 | PDF
    The reported work includes the experiment testing of glass fiber reinforced polymer (GFRP) and steel reinforced concrete bridge barriers. A total of four reinforced concrete barriers were prepared, including three GFRP reinforced barriers and one mild steel reinforced barrier, and cast on two concrete slabs. Impact testing was conducted using a car ...
  • GFRP Reinforced Bridge Barriers Impact Experiment
    GFRP Reinforced Bridge Barriers: Impact Experiment
    Wei, Congjie ;
    Gadhe, Manish Kumar
    2025-07-01 | PDF
    The reported work includes the experiment testing of glass fiber reinforced polymer (GFRP) and steel reinforced concrete bridge barriers. A total of four reinforced concrete barriers were prepared, including three GFRP reinforced barriers and one mild steel reinforced barrier, and cast on two concrete slabs. Impact testing was conducted using a car ...
  • 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 ...
  • Estimating HCM Default Parameters for Louisiana
    Estimating HCM Default Parameters for Louisiana
    Rahman, M Ashifur ;
    Moomen, Milhan
    2025-07-01 | PDF
    Although the Highway Capacity Manual (HCM) provides default values for its methodologies, it also states that these values represent typical national values and that conditions within a state, region, or community may differ. When default values are applied frequently in analyses, the use of local default values can reduce the uncertainty in the an ...
  • Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction ABC Unit for Texas Bridges
    Development of a Continuous for Live Load Prefabricated Steel Accelerated Bridge Construction (ABC) Unit for Texas Bridges
    Hurlebaus, Stefan ;
    Yarnold, Matthew T.
    2025-07-01 | PDF
    This research study developed and evaluated prefabricated steel bridges made continuous for live load utilizing accelerated bridge construction (ABC). The project created a steel ABC transverse connection detail at the bridge piers that allows the structure to behave as simply supported for dead load and continuous for live load. This detail is rel ...
  • Developing an Enhanced Protection of Median Openings Between Parallel Bridge Structures
    Developing an Enhanced Protection of Median Openings Between Parallel Bridge Structures
    Kovar, James C. ;
    Loza, Alondra
    2025-07-01 | PDF
    The objective of this project was to develop a method to prevent errant motorists from entering the median openings between parallel bridge structures. This project identified characteristics that could be used to target potential sites for implementation of a median opening protection system (MOPS). In this identification process, the research tea ...
  • Performance Index Rating and Maintenance Cost Assignment for Ramps Acceleration Lanes and Deceleration Lanes in Louisiana
    Performance Index Rating and Maintenance Cost Assignment for Ramps, Acceleration Lanes, and Deceleration Lanes in Louisiana
    Liu, Jun ;
    Chen, Qiming
    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 ...
  • 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 ...
  • 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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