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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 1021 - 1040 of 36104 results
  • Improving Smart Work Zone Deployments in Texas
    Improving Smart Work Zone Deployments in Texas
    Ullman, Gerald ;
    Miller, Matt
    2024-08-01 | PDF
    Smart work zones utilize technologies and strategies to enhance transportation safety, mobility, traveler satisfaction, and even construction/maintenance productivity through and around work zones. To date, there have been both positive and negative experiences with the technology. The objectives of this study were to determine why some smart work ...
  • Electric Vehicles Public Perceptions Expectations and WillingnesstoPay
    Electric Vehicles: Public Perceptions, Expectations, and Willingness-to-Pay
    Moras, Bruno Cesar Krause ;
    Chen, Xiaowei
    2024-08-01 | PDF
    The primary objective of this project was to understand Indiana resident’s perspectives on electric vehicles (EVs), including adoption incentives and barriers, awareness of adoption incentives, charging preferences, and general travel patterns. A secondary objective was to establish a framework for identifying EV users, detailing their trips, and g ...
  • Accessible Bus Stop Design in the Presence of Bike Lanes
    Accessible Bus Stop Design in the Presence of Bike Lanes
    Christofa, Eleni ;
    Ai, Chengbo
    2024-08-01 | PDF
    Floating bus stops are used to facilitate transit operations and enhance accessibility by allowing in-lane stops. A bike channel separates the platform from the sidewalk, preventing conflicts between buses and bicycles but potentially causing conflicts between bicyclists and bus riders. The objectives of this research are to: 1) investigate bus rid ...
  • Evaluation of Manual Thermal Brake Screening Systems
    Evaluation of Manual Thermal Brake Screening Systems
    Koo, Jeeyen ;
    Leddy, David
    2024-08-01 | PDF
    In 2021, manual thermal brake screening systems were installed at Lyon EB and Rowan County weigh stations. Two additional units were installed at Laurel SB and Scott County weigh stations the following year. Although this system is called a thermal brake screening system, its thermal camera images are used to find both brake and tire-related violat ...
  • FX2Division Shared Bicycle and Pedestrian Platform Evaluation
    FX2-Division: Shared Bicycle and Pedestrian Platform Evaluation
    McNeil, Nathan ;
    Kothuri, Sirisha
    2024-08-01 | PDF
    To accommodate passing bicyclists and transit riders accessing the new FX2 TriMet bus rapid transit line in Portland, TriMet worked with the City of Portland and broad group of stakeholders and partners to design and implement a new shared use bus platform that incorporates a sidewalk / platform level bike lane. The SE Division corridor was designa ...
  • GoGallatin Annual Report July 1 2023 June 30 2024
    GoGallatin Annual Report: July 1, 2023 – June 30, 2024
    Harriet, Nathan ;
    Madsen, Matthew
    2024-08-01 | PDF
    This third annual report seeks to share our programmatic growth, successes, and areas for improvement with our partners and the community. We are proud of our work, the work of our partners, and are excited for our future, and we think you will be as well.
  • 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 | AVI
    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 ...
  • Traffic Safety Facts 20132022 Data SchoolTransportationRelated Traffic Crashes
    Traffic Safety Facts 2013-2022 Data: School-Transportation-Related Traffic Crashes
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-08-01 | PDF
    From 2013 to 2022 there were 976 fatal school-transportation-related traffic crashes, and 1,082 people of all ages were killed in those crashes—an average of 108 fatalities per year. A school-transportation-related motor vehicle traffic crash directly or indirectly involves a school transportation vehicle that is either a school bus body type or a ...
  • 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 ...
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