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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 1381 - 1400 of 36873 results
  • Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities Summary
    Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities [Summary]
    Bullock, Darcy M.
    ORCID ICON IMG
    2024-08-01 | PDF
    The Indiana Department of Transportation (INDOT) manages over 2,000 traffic signals in the State. It is unfeasible to identify systemwide improvement opportunities by evaluating the performance of thousands of traffic signals on monitoring dashboards. This report describes how a scalable technique based on connected vehicle (CV) trajectory data sys ...
  • 07002 Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity Summary
    0-7002: Geosynthetic Reinforcement in Asphalt Overlays for Increased Roadway Structural Capacity [Summary]
    Kumar, V Vinay ;
    Roodi, Gholam H.
    2024-08-01 | PDF
    Geosynthetic products, including geogrids, geotextiles, geocells, geonets, and geomembranes, can be used to improve roadway systems significantly through a wide range of functions, such as separation, filtration, stiffening, reinforcement, drainage, hydraulic/gas barriers, and protection. One of the several applications involving geosynthetics is t ...
  • Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities MP4
    Business Processes to Prioritize Traffic Signal Retiming and Assess the Impact of Retiming Activities [MP4]
    Purdue University. Joint Transportation Research Program
    2024-08-01 | MP4
    Purdue Probe Diagram Video
  • Determine Adequacy of Existing Roadside Barriers on HighSpeed Roadways
    Determine Adequacy of Existing Roadside Barriers on High-Speed Roadways
    Chamargore, Sonal ;
    Bligh, Roger
    2024-08-01 | PDF
    Longitudinal barriers (e.g., guardrails, median barriers, and bridge rails) are currently tested and evaluated at a design impact speed of 62 mph. Posted speed limits have increased in recent years. New or modified barrier designs may be needed to withstand high-speed impacts to maintain the desired level of safety for motorists traveling on high-s ...
  • Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England Fact Sheet
    Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England [Fact Sheet]
    Kuzovkina, Julia ;
    Campanelli, John
    2024-08-01 | PDF
    This report provides guidance for the establishment of native habitats in New England. It describes the seed mixes of native plants for various soil conditions, establishment of native habitats using various techniques, guidelines for conservation mowing and ecotypic seed production in the region.
  • Inventorying Documenting and Configuring Traffic Management System Assets and Resources Current Practices
    Inventorying, Documenting, and Configuring Traffic Management System Assets and Resources — Current Practices
    Lukasic, Daniel ;
    Belella, Paul
    2024-08-01 | PDF
    This report explores the benefits of developing, using, and maintaining an inventory of traffic management system (TMS) assets and resources for State and local agencies. By documenting, inventorying, and configuring assets and resources, agencies can enhance the day-to-day management and operation of TMSs. Agencies may also benefit from incorporat ...
  • Traffic Safety Facts 2022 Data AlcoholImpaired Driving
    Traffic Safety Facts 2022 Data: Alcohol-Impaired Driving
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-08-01 | PDF
    In 2022 there were 13,524 fatalities in motor vehicle traffic crashes in which at least one driver was alcohol impaired. This represented 32 percent of all traffic fatalities in the United States for the year. Traffic fatalities in alcohol-impaired-driving crashes decreased by 0.7 percent (13,617 to 13,524 fatalities) from 2021 to 2022. One alcohol ...
  • Implementation of Understanding the Impact of Autonomous Vehicles on LongDistance Travel Mode and Destination Choice in Texas
    Implementation of Understanding the Impact of Autonomous Vehicles on Long-Distance Travel Mode and Destination Choice in Texas
    Kockelman, Kara ;
    Vellimana, Maithreyi
    2024-08-01 | PDF
    Privately owned and shared autonomous vehicles (AVs and SAVs) and automated trucks (ATrucks) are coming to the US and Texas. This project updated TxDOT’s Statewide Analysis Model (SAM) to integrate AVs, SAVs, and ATrucks as added transportation modes. For passenger trips over 50 miles (one way), the nested logit model was modified to include househ ...
  • Cold Asphalt Recycling Technologies Using Rejuvenating Asphalt Emulsion Impact Implementation Specification
    Cold Asphalt Recycling Technologies Using Rejuvenating Asphalt Emulsion: Impact, Implementation, Specification
    Tabatabaee, Hassan A. ;
    Swiertz, Dan
    2024-08-01 | PDF
    Cold-recycling processes such as Cold in Place Recycling (CIR) and Cold-Central Plant Recycling (CCPR) offer opportunities for innovation through the use of recycling additives (RAs). The objective of this project was to evaluate the efficacy of rejuvenating asphalt emulsions in the CIR and/or CCPR process in terms of potential performance benefits ...
  • Implementing the LWD for MoDOT Construction Acceptance of Unbound Material Layers Phase II Research Summary
    Implementing the LWD for MoDOT Construction Acceptance of Unbound Material Layers: Phase II [Research Summary]
    Zhang, Xiong
    2024-08-01 | PDF
    This Phase II project aimed to accumulate more field test data to improve the standards for the implementation of the Zorn lightweight deflectometer (LWD) for the acceptance of unbound materials layers. Five more different soils, including New Florence CL (lean clay), Holts Summit GM (silty gravel), Sikeston SM (silty sand), Rolla CL (lean clay), a ...
  • Implementing the LWD for MoDOT Construction Acceptance of Unbound Material Layers Phase II
    Implementing the LWD for MoDOT Construction Acceptance of Unbound Material Layers: Phase II
    Zhang, Xiong ;
    Liu, Jenny
    2024-08-01 | PDF
    This Phase II project aimed to accumulate more field test data to improve the standards for the implementation of the Zorn lightweight deflectometer (LWD) for the acceptance of unbound materials layers. Five more different soils, including New Florence CL, Holts Summit GM, Sikeston SM, Rolla CL, and Rolla GM, were collected from different project s ...
  • Guidelines for Utilization of Field Sands in Superpave Mixtures of Texas
    Guidelines for Utilization of Field Sands in Superpave Mixtures of Texas
    Vaid, Suhail R ;
    Afsha, Sharmila
    2024-08-01 | PDF
    Field sands have been used in hot mix asphalt (HMA) pavements to improve workability since they are readily available and less expensive than crushed materials. However, due to their potential adverse effects on performance, field sands are typically limited to 10% of the aggregates. A key issue is the presence of harmful clay particles that can si ...
    Supporting Files
  • ODOTs Snow and Ice Performance Evaluation Tools A Student Transportation Advancement Research STAR Project
    ODOT‘s Snow and Ice Performance Evaluation Tools - A Student Transportation Advancement Research (STAR) Project
    Masanja, Ntemi Methusela ;
    Mihayo, Meshack P
    2024-08-01 | PDF
    Severe winter weather poses a significant threat to road users, primarily due to slippery road surfaces, which considerably increase the risk of crashes and injuries. Additionally, such conditions can disrupt traffic flow on highways, causing speed reductions, decreased highway capacity, or even complete traffic lockdowns. Most Departments of Trans ...
  • Mitigating and Preventing MoDOT SafetyRelated Incidents Through RootCause Elimination and Utilization of Leading Safety Indicators
    Mitigating and Preventing MoDOT Safety-Related Incidents Through Root-Cause Elimination and Utilization of Leading Safety Indicators
    Chammout, Bahaa ;
    El-adaway, Islam
    2024-08-01 | PDF
    This report thoroughly investigates and analyzes the diverse factors influencing incident occurrence in work zone environments, aiming to identify areas where proactive planning can enhance incident mitigation. Drawing from an extensive review of existing literature on work zone safety, 37 factors affecting both public and occupational safety were ...
  • Traffic Safety Facts 2022 Data Older Population
    Traffic Safety Facts 2022 Data: Older Population
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-08-01 | PDF
    In 2022 there were 7,971 people 65 and older killed and an estimated 268,622 injured in motor vehicle traffic crashes. Older people made up 19 percent of all traffic fatalities and 11 percent of all people injured in 2022. Compared to 2021 there was a 6-percent increase in the number of traffic fatalities and a 1-percent increase in the estimated n ...
  • Traffic Safety Facts CrashStats Seat Belt Use in 2023 Use Rates in the States and Territories
    Traffic Safety Facts Crash-Stats: Seat Belt Use in 2023 ─ Use Rates in the States and Territories
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-08-01 | PDF
    In 2023 seat belt use in the United States ranged from 68.2 percent in the U.S. Virgin Islands to 98.4 percent in Hawaii. Twenty-seven States, the District of Columbia, Guam, Puerto Rico, and the Northern Mariana Islands achieved seat belt use rates of 90 percent or higher. These results are from probability-based observational surveys conducted by ...
  • TimetoFailure Prediction of FineGrained Soil Slopes Subject to WeatherDriven Deterioration Research Brief
    Time-to-Failure Prediction of Fine-Grained Soil Slopes Subject to Weather-Driven Deterioration [Research Brief]
    Morsy, Amr M
    2024-08-01 | PDF
    This study aimed to forecast the time to failure of aging, deteriorating clay embankments supporting transportation infrastructure. This study utilized the user-defined subroutines that were developed and implemented by Morsy et al. to allow transient calculations of coupled hydromechanical behavior.
  • Jaunt Rural Transit Needs Assessment
    Jaunt Rural Transit Needs Assessment
    Mattson, Jeremy ;
    Hough, Jill
    2024-08-01 | PDF
    This study examines rural transit needs for Jaunt. The objective is to quantify the need for transit services in each of Jaunt’s partner jurisdictions. Jaunt provides transit in the city of Charlottesville, Virginia, and the counties of Albemarle, Buckingham, Fluvanna, Greene, Louisa, and Nelson. Neighboring Goochland County is also included in the ...
  • Improve Data Quality for Automated Pavement Distress Data Collection
    Improve Data Quality for Automated Pavement Distress Data Collection
    Wang, Feng ;
    Luo, Xiaohua
    2024-08-01 | PDF
    Since Fiscal Year 2017, the Texas Department of Transportation (TxDOT) has employed advanced automated and semi-automated techniques using 3D laser technology and high-resolution cameras to collect pavement condition data over 197,000 lane miles. Although this approach marks a significant technological advancement, concerns about the accuracy and p ...
  • Redesign of Innovative Gate Arms Ramp Closure Gate Phase I Research Project Capsule 242ST
    Redesign of Innovative Gate Arms (Ramp Closure Gate) – Phase I: Research Project Capsule [24–2ST]
    Cakalli, Sofokli ;
    Codjoe, Julius
    2024-08-01 | PDF
    This project aims to redesign the existing ramp closure gate used by Louisiana DOTD. The research team will utilize FE computer simulations and laboratory crash testing to develop a modified design that both passes MASH test protocols consistently and meets the functional requirements.
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