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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 1501 - 1520 of 35452 results
  • Assessing Stormwater Ponds for Phosphorus Retention
    Assessing Stormwater Ponds for Phosphorus Retention
    Bintner, Ross ;
    Gulliver, John S.
    2023-08-01 | PDF
    This project’s goals were to understand the features or characteristics of ponds that impact their ability to retain phosphorus and then develop practical tools and recommendations for management practices.
  • The Current State of Practice of Building Information Modeling
    The Current State of Practice of Building Information Modeling
    Brooks, Kevin ;
    Gerasimidis, Simos
    2023-08-01 | PDF
    Building information modeling is a combination of technology and processes that has made significant changes to the architecture, engineering, construction, and operations industries. By enabling the visualization of project elements and their data in 3D, it allows for a reduction in unbudgeted changes, increased collaboration and efficiency, and n ...
  • The Current State of Practice of Building Information Modeling
    The Current State of Practice of Building Information Modeling
    Brooks, Kevin ;
    Gerasimidis, Simos
    2023-08-01 | PDF
    Building information modeling is a combination of technology and processes that has made significant changes to the architecture, engineering, construction, and operations industries. By enabling the visualization of project elements and their data in 3D, it allows for a reduction in unbudgeted changes, increased collaboration and efficiency, and n ...
  • Evaluation of Allowable Taper Rates of Freestanding SingleSlope Concrete Barriers
    Evaluation of Allowable Taper Rates of Freestanding Single-Slope Concrete Barriers
    Bligh, Roger P. ;
    Cakalli, Sofokli
    2023-08-01 | PDF
    The Texas Department of Transportation desires to flare the ends of its freestanding single-slope concrete barrier system so the system can be terminated outside the clear zone. Currently, limited guidance exists on the acceptable flare rate for the single-slope portable concrete barrier under the American Association of State Highway and Transport ...
  • BFRP Rebar Characterization and Performance Summary
    BFRP Rebar Characterization and Performance [Summary]
    Nolan, Steven ;
    Kampmann, Raphael
    2023-08-01 | PDF
    This research was conducted to evaluate the performance of three commercially available BFRP rebar products, before and after exposure to nine different aggressive environments, to develop acceptance criteria specifically for basalt-based fiber-reinforced polymer (BFRP) reinforcing bars.
  • Maximizing Equity in Managed Lane Planning Technical Summary
    Maximizing Equity in Managed Lane Planning [Technical Summary]
    Larsen, Bradley ;
    Lari, Adeel Z.
    2023-08-01 | PDF
    Managed lanes provide transportation agencies with a strategy for reducing congestion and improving travel times along urban highways. These designated lanes, known as E-ZPass lanes in Minnesota, are available to carpoolers and transit users for free during high-traffic times, while vehicle owners who are driving alone pay a fee.
  • Alternative Fuel Vehicle Usage and Owner Demographics in New York State An Analysis of 2017 National Household Travel Survey Data
    Alternative Fuel Vehicle Usage and Owner Demographics in New York State: An Analysis of 2017 National Household Travel Survey Data
    Pan, Meiyu (Melrose) ;
    Uddin, Majbah
    2023-08-01 | PDF
    With mounting concerns over climate change and the environmental impact of fossil fuels, the United States has witnessed a growing interest in alternative fuel vehicles (AFVs). In 2021, approximately 1.5 million battery EVs (BEVs), 0.8 million plug-in hybrid EVs (PHEVs), and 5.5 million hybrid EVs (HEVs) were registered in the United States. In the ...
  • Establishing a Repeatable Method for Presenting Nontraditional Traffic Treatments to Maximize Stakeholder Support
    Establishing a Repeatable Method for Presenting Nontraditional Traffic Treatments to Maximize Stakeholder Support
    Morris, N L ;
    Schwieters, K S
    2023-08-01 | PDF
    A novel infrastructure design known as the J-turn intersection reduces the risk of serious and fatal crashes at thru-STOP intersections through decreasing points of conflict at an intersection by restricting crossing movements from the minor road. Despite their demonstrated safety efficacy, J-turns have not been met with uniformly positive support. ...
  • Optimizing Asphalt Mixtures for Lowvolume Roads in Minnesota
    Optimizing Asphalt Mixtures for Low-volume Roads in Minnesota
    Barman, Manik ;
    Dhasmana, Heena
    2023-08-01 | PDF
    Minnesota has a large number of low-volume asphalt roads. These roads typically fail because of environmental factors, such as frigid temperatures, freeze-thaw cycles, and seasonal and daily temperature variations. The goal of this study was to suggest modifications to asphalt mixture designs currently used for low-volume roads in Minnesota to impr ...
  • Effect of Low and Moderate Recycled Concrete Aggregate Replacement Levels on Concrete Properties
    Effect of Low and Moderate Recycled Concrete Aggregate Replacement Levels on Concrete Properties
    Lederle, Rita ;
    Selin, Evan
    2023-08-01 | PDF
    This research investigated the effects of incorporating recycled concrete aggregate (RCA) at low replacement levels on the properties of concrete. Four different RCA sources were used, each with different aggregate properties. For each source, replacement levels of 5, 10, and 15% were tested and compared to a control group, which had no RCA. Of the ...
  • Evaluation of Attachments to Concrete Barrier Systems to Deter PedestriansVolume 2 Crash Report
    Evaluation of Attachments to Concrete Barrier Systems to Deter Pedestrians—Volume 2: Crash Report
    Silvestri-Dobrovolny, Chiara ;
    Bligh, Roger
    2023-08-01 | PDF
    The purpose of the tests reported herein was to assess the performance of prioritized attachments to concrete barrier systems according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH), Second Edition. The crash tests for th ...
  • Evaluation of Attachments to Concrete Barrier Systems to Deter PedestriansVolume 1 Technical Report
    Evaluation of Attachments to Concrete Barrier Systems to Deter Pedestrians—Volume 1: Technical Report
    Silvestri-Dobrovolny, Chiara ;
    Bligh, Roger
    2023-08-01 | PDF
    Concrete rigid barriers are used in medians to separate traffic and on the roadside to shield hazards from motorists and motorists from hazards. These barriers need to demonstrate crashworthiness through full-scale testing per the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH). Attachm ...
  • Synthesis of Galvanized Steel Reinforcement Corrosion Performance Summary
    Synthesis of Galvanized Steel Reinforcement Corrosion Performance [Summary]
    Simmons, Ronald ;
    Alexander, Christopher
    2023-08-01 | PDF
    This research was a synthesis of technical literature to help determine whether to allow the use of HDGR to increase durability.
  • Strengthening Communities with Innovative Right of Way Projects Technical Summary
    Strengthening Communities with Innovative Right of Way Projects [Technical Summary]
    Austin, Lisa ;
    Douma, Frank
    2023-08-01 | PDF
    When many urban highway projects were built several decades ago, thriving communities were physically divided and negatively impacted. As social awareness and urban design have evolved, some areas have developed strategies for repairing and revitalizing these communities by redesigning right of way (ROW) areas along highway corridors.
  • Refining the Lane Guidance System for Snowplow Operators Technical Summary
    Refining the Lane Guidance System for Snowplow Operators [Technical Summary]
    Donath, Max ;
    Rowe, Daniel
    2023-08-01 | PDF
    Snowplow operators work in difficult, often low-visibility conditions. A new system assists drivers in knowing their lane position and warns of approaching obstacles. After operators tested the system over two winters, researchers gathered feedback, revised the system and readied it for the next step in statewide deployment.
  • Assessment of Transportation Systems Resilience for Vulnerable Communities and Populations Summary
    Assessment of Transportation Systems Resilience for Vulnerable Communities and Populations [Summary]
    Carver, Jennifer Z ;
    Abdelrazig, Yassir
    2023-08-01 | PDF
    This research aimed to develop decision support tools for transportation systems resilience planning pertaining to three vulnerable populations—older adults, ethnic minority groups, and rural populations. Also, it provided resilience policy and planning recommendations for transportation systems to improve the outcomes for vulnerable communities an ...
  • Assessment of the Infrastructure Readiness for Connected Vehicle to Infrastructure Applications on Arterial Streets Summary
    Assessment of the Infrastructure Readiness for Connected Vehicle to Infrastructure Applications on Arterial Streets [Summary]
    Vollmer, Derek ;
    Hadi, Mohammad
    2023-08-01 | PDF
    Connected vehicles (CV) are the future. To be safe, modern CVs must communicate with the infrastructure around them. Therefore, the Florida Department of Transportation (FDOT) needs to establish requirements for CV applications used in conjunction with roadside equipment (RSE) like signal controllers.
  • Performance of Skew Reinforcing in InvertedT Bridge Caps of Donigan Road Bridge Katy Texas
    Performance of Skew Reinforcing in Inverted-T Bridge Caps of Donigan Road Bridge, Katy, Texas
    Joshi, Bhagirath ;
    Ramaswamy, Nagesh
    2023-08-01 | PDF
    Reinforced concrete inverted-T bridge caps (ITBCs) have been widely used in Texas and the United States bridges. They are aesthetically pleasing, offer a practical means to increase vertical clearance, and have practical applications to address landscaping requirements. The ITBCs in Texas are designed using the traditional empirical procedures outl ...
  • Workshop Guide Rapid Mix Design of CementTreated Base
    Workshop Guide: Rapid Mix Design of Cement-Treated Base
    Taylor, Ross ;
    Sebesta, Stephen
    2023-08-01 | PDF
    Objectives: Reduce the testing burden • Use less materials • Produce mix design results faster • Use with materials for both plant and road mix projects • Harmonize mix design approach, to the extent reasonable, across stabilizer types
  • Development of Protocols for Reuse Assessment of Existing Foundations in Bridge Rehabilitation and Replacement Projects
    Development of Protocols for Reuse Assessment of Existing Foundations in Bridge Rehabilitation and Replacement Projects
    Lim, Jeehee ;
    Salgado, Rodrigo
    2023-08-01 | PDF
    The existing foundations of a bridge can sometimes be reused. This may occur when a completely new bridge is built but also in bridge or superstructure widening projects. Reuse of existing foundations not only eliminates the costs associated with demolishing and disposing of old foundations, but also reduces the costs of the design and construction ...
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