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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 661 - 680 of 36368 results
  • Coastal Flood Roadway Vulnerability Assessment
    Coastal Flood Roadway Vulnerability Assessment
    Bilskie, Matthew V ;
    Kim, S. Sonny
    2025-03-01 | PDF
    Coastal flood data and maps were developed using an ADvanced CIRCulation (ADCIRC) hydrodynamic model with resolution as fine as 30 m on the coastline. Annual exceedance probability (AEP) still water levels caused by storm surges were taken from the United States Army Corps of Engineers (USACE) South Atlantic Coastal Study’s (SACS) publicly availabl ...
  • Setting Speed Limits English Version
    Setting Speed Limits: English Version
    Texas A&M Transportation Institute
    2025-03-01 | PDF
    Posted speed limits (PSLs) are a highly complex issue involving engineering, human factors, and political and societal concerns. On a national level, recent research along with calls to change how speed limit are set, especially for city streets, have generated extensive discussion on future speed limit setting procedures. Recent Texas Department o ...
  • Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida Brief
    Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida [Brief]
    Yan, Xiang Jacob
    2025-03-01 | PDF
    Mobility hubs (MHs) can facilitate seamless transitions between various transportation modes, such as transit, ridehailing, and micromobility, enhancing multimodal travel and delivering socioeconomic benefits. To inform mobility hub planning and development in Florida cities and beyond, this project develops a multi-criteria, GIS-based MH site sele ...
  • Performance and Improvement of Texas Poor Boy Continuous Bridge Deck Details Final Report
    Performance and Improvement of Texas Poor Boy Continuous Bridge Deck Details: Final Report
    Birely, Anna C. ;
    Yarnold, Matthew T.
    2025-03-01 | PDF
    The majority of bridges in Texas are constructed with girders as simple spans. A simple-span deck requires expansion joints, which are sources of maintenance and durability issues. To avoid this, continuous decks, known as “poor boy joints” in Texas Department of Transportation (TxDOT) bridges, are an attractive option. These details are commonly k ...
  • Steel Bridge Coating and Recoating Warranty Requirements Brief
    Steel Bridge Coating and Recoating Warranty Requirements [Brief]
    Padilla, Felix ;
    Ault, Pete
    2025-03-01 | PDF
    The service life of steel bridge coatings in Florida is occasionally shorter than the intended design life, resulting in the need for increased maintenance painting. This project examined the value of warranty terms potentially included in painting contracts to improve the quality and durability of steel bridge coatings. The research found that the ...
  • TMA Truck Safety
    TMA Truck Safety
    Edara, Praveen K. ;
    Qing, Zhu
    2025-03-01 | PDF
    This study evaluates the effectiveness of in-vehicle safety countermeasures in reducing injury risk for TMA (Truck-Mounted Attenuator) truck occupants during collisions. With increasing incidents involving TMAs in work zones, understanding the protective impact of advanced safety features has become crucial. A review of historical TMA crash reports ...
  • TMA Truck Safety Research Summary
    TMA Truck Safety [Research Summary]
    Edara, Praveen K.
    ORCID ICON IMG
    2025-03-01 | PDF
    This study evaluates the effectiveness of in-vehicle safety countermeasures in reducing injury risk for TMA (Truck-Mounted Attenuator) truck occupants during collisions. With increasing incidents involving TMAs in work zones, understanding the protective impact of advanced safety features has become crucial. A review of historical TMA crash reports ...
  • Development of Measures for Highway Criticality Assessment
    Development of Measures for Highway Criticality Assessment
    Zhang, Xu ;
    Chen, Mei
    2025-03-01 | PDF
    Existing network criticality assessments, often biased towards heavily used highways in populous areas by incorporating traffic and sociodemographic attributes, can lead to an underestimation of the vital role of rural infrastructure. Consequently, rural highways, particularly low-volume roads, often receive less consideration despite their critica ...
  • NonMotorized Count Program and Risk Factors Assessment
    Non-Motorized Count Program and Risk Factors Assessment
    Tien, Iris ;
    Watkins, Kari E.
    2025-03-01 | PDF
    Non-motorized volumes at different locations in a transportation network are important data for understanding safety and travel needs for people who bike and walk. In Georgia, however, there are limited data about non-motorized volumes in transportation systems given, and in general, these modes volumes are difficult to predict due to high variabil ...
  • Superabsorbent Polymer in Concrete to Improve Durability
    Superabsorbent Polymer in Concrete to Improve Durability
    Zhou, Bo ;
    Taylor, Peter
    2025-03-01 | PDF
    The main objective of this research was to explore the optimized selection of superabsorbent polymer (SAP) products as internal curing materials in concrete and to examine the effects of the use of eight selected SAPs on properties that affect concrete performance, including shrinkage, hydration, permeability, and strength. Experimental results dem ...
  • Review of the Current Transportation Asset Management Practices in Wyoming Data Management Plan
    Review of the Current Transportation Asset Management Practices in Wyoming [Data Management Plan]
    Aleadelat, Waleed ;
    Ksaibati, Khaled
    2025-03-01 | PDF
    WYDOT maintains a vast network consisting of Interstate, NHS and non-NHS roads. The existing infrastructure needs continues maintenance to keep in good condition and safe for users. To achieve this, WYDOT needs a considerable amount of funding every year and anticipates the demand for future maintenance through performance models. This future maint ...
  • Truck Parking Shortage Improving Efficiency and Identifying Opportunities Summary
    Truck Parking Shortage: Improving Efficiency and Identifying Opportunities [Summary]
    Stich, Bethany ;
    Rupnow, Tyson
    2025-03-01 | PDF
    In coordination with the American Trucking Association (ATA) and American Transportation Research Institute (ATRI), this project aims to address truck parking issues with short- and long-term solutions. The short-term solution is to identify what truck parking exists, how it is managed, and what and where Variable Message Signage (VMS) exists for t ...
  • Ebike Lending Libraries Trends and Practices in The United States
    E-bike Lending Libraries: Trends and Practices in The United States
    MacArthur, John ;
    Miller, Joshua
    2025-03-01 | PDF
    E-bike lending libraries are emerging as a potential tool to promote sustainable transportation, reduce greenhouse gas emissions, and enhance mobility equity across communities in the United States. By offering residents the opportunity to borrow e-bikes for periods ranging from a couple of hours to several months, these programs help address barri ...
  • Gravel Road Performance Enhancements
    Gravel Road Performance Enhancements
    Cetin, Bora ;
    Cetin, Kristen
    2025-03-01 | PDF
    Nearly 30% of roads in the U.S. are unpaved, significantly impacting rural connectivity with Nebraska alone having approximately 75% unpaved roads. This study systematically evaluates local materials to improve gravel road performance, reduce maintenance frequency, and decrease financial burdens on counties. Survey responses revealed that nearly 70 ...
  • Research Summary Increasing Service Reliability by Adding a Dedicated Right of Way for Buses
    Research Summary: Increasing Service Reliability by Adding a Dedicated Right of Way for Buses
    Song, Ying
    2025-03-01 | PDF
    Transit services connect people to jobs and opportunities, fostering vibrant communities and multimodal travel along service corridors. A transit right-of-way (ROW) can help buses bypass congestion and stay on schedule. Many studies have proved that transit ROWs effectively improve service reliability and reduce user costs. However, these studies o ...
  • Comparison of Compost and Proprietary Soil Amendments for Vegetation Establishment
    Comparison of Compost and Proprietary Soil Amendments for Vegetation Establishment
    Cetin, Bora ;
    Saltali, Oguzhan
    2025-03-01 | PDF
    Post-construction roadside soils often suffer from compaction, low fertility, and poor structure, challenging vegetation establishment and stormwater management. This study evaluates the effectiveness of organic amendments (OAs) and proprietary amendments as alternatives to traditional methods. The study involves greenhouse experiments (pot and mes ...
  • Centerline Buffers on FourLane Undivided Roadways Technical Brief
    Centerline Buffers on Four-Lane Undivided Roadways [Technical Brief]
    Texas A&M Transportation Institute
    2025-03-01 | PDF
    Research results indicate that 4-ft centerline buffers on four-lane highways are highly effective in reducing lane departure crashes.
  • HalfRound Bearing Stiffeners for Skewed Steel IGirders Brief
    Half-Round Bearing Stiffeners for Skewed Steel I-Girders [Brief]
    Mehrabi, Armin
    ORCID ICON IMG
    2025-03-01 | PDF
    Skewed steel I-girder bridges present unique structural challenges due to their angled geometry, which affects load distribution and increases potential for fatigue and stress concentrations. Traditional connection methods, such as bent plate connections, can introduce flexibility, leading to reduced stability. FDOT is exploring Half-Round Bearing ...
  • Improved Incident Response through Coordinated Interoperable Communications
    Improved Incident Response through Coordinated, Interoperable Communications
    Moomen, Milhan ;
    Rahman, Ashifur
    2025-03-01 | PDF
    This study aimed to conduct a needs assessment and performance evaluation of Traffic Incident Management (TIM) in Louisiana and identify areas for TIM improvement. The study also aimed to assess interoperability as a solution to communication gaps. The research team achieved this by performing evaluations and assessments of Louisiana’s TIM and comm ...
  • Technical Assistance for Quantifying Emissions from Asphalt Mixtures
    Technical Assistance for Quantifying Emissions from Asphalt Mixtures
    Sadeghi, M ;
    Bairgi, B K
    2025-03-01 | PDF
    This study evaluated the effects of using Warm Mix Asphalt (WMA) technologies to reduce asphalt production temperatures on energy consumption and pavement performance in Alabama. Two field experiments were conducted. The first compared two chemical WMA mixtures to a conventional Hot Mix Asphalt (HMA), while the second used one of the WMA technologi ...
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