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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 721 - 740 of 35448 results
  • 5704901 Implementation of Improving and Communicating Speed Management Practices Summary
    5-7049-01: Implementation of Improving and Communicating Speed Management Practices [Summary]
    Fitzpatrick, Kay ;
    Venglar, Steven P.
    2024-08-30 | 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 ...
  • Illinois Highway Materials Sustainability Efforts 2023
    Illinois Highway Materials Sustainability Efforts 2023
    Senger, Kelly
    2024-08-28 | PDF
    The Illinois Department of Transportation (IDOT) continues to use a variety of reclaimed and recycled materials in highway construction. Recycled materials are used in highway construction to supplement aggregates, concrete, hot-mix asphalt (HMA), steel, and sealants, as well as for soil modification and pavement markings. This report summarizes th ...
  • Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida Project BED31 TWO 97714
    Leveraging Mobility Data Analytics to Inform Mobility Hub Development in Florida Project BED31 TWO 977-14
    Yan, Xiang Jacob ;
    Lyu, Duanya
    2024-08-20 | 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 ...
  • Geotechnical Asset Management GAM Phase II Project Capsule 244GT
    Geotechnical Asset Management (GAM) Phase II: Project Capsule [24-4GT]
    Ferguson, Nicholas ;
    Rupnow, Tyson
    2024-08-15 | PDF
    The research objectives for this project can be summarized as follows: 1. Grow Geotechnical Asset Management (GAM) in Louisiana. 2. Build/rebuild a culvert inventory database that will benefit multiple DOTD sections. 3. Establish condition and consequence criteria for culvert risk determinations and maintenance priorities. 4. Develop a roadmap for ...
  • Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England
    Initiating Seed Production for Effective Establishment of Native Plants on Roadsides in New England
    Campanelli, John ;
    Kuzovkina, Julia
    2024-08-09 | 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.
  • 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
  • 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.
  • 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 ...
  • OSTR Research Roundup Newsletter August 2024
    OST-R Research Roundup Newsletter: August 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-08-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Assessing the Suitability of NonRegulatory Sensors for Particulate Matter Measurements in Transportation Applications
    Assessing the Suitability of Non-Regulatory Sensors for Particulate Matter Measurements in Transportation Applications
    Kolesar, Katheryn R
    2024-08-01 | PDF
    In 2020, the Colorado Department of Transportation (CDOT), in collaboration with the Colorado Department of Public Health & Environment (CDPHE) Air Pollution Control Division (APCD), began monitoring along a section of Interstate (I) 270 that is slated for roadway construction. Specifically, five types of non-regulatory supplemental and information ...
  • 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 ...
  • Multimodal Airport Charging Station Deployment Phase I
    Multimodal Airport Charging Station Deployment – Phase I
    Trendowski, John ;
    Jost, Kelly
    2024-08-01 | PDF
    The Multimodal Airport Charging Station Deployment – Phase I research addressed the following principal objectives: Conduct a feasibility analysis for a multimodal charging station at a Michigan Airport, and provide recommendations on design and implementation of multimodal charging stations. The research team reviewed previous reports, evaluated a ...
  • 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 ...
  • 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 ...
  • Snow Plow Performance Measures in NonRWIS Locations
    Snow Plow Performance Measures in Non-RWIS Locations
    Jiang, Gang ;
    Kuang, Biao
    2024-08-01 | PDF
    This project aims to enhance traffic safety by developing an Artificial Intelligence (AI) model and the weather interpolation method to evaluate snow cover conditions on road surfaces using existing roadside Closed-Circuit Television system (CCTV) images in non-Road Weather Information System (RWIS) locations. Snow- cover significantly impacts traf ...
  • 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 ...
  • Feasibility of 3D Printing Applications for Highway Infrastructure Construction and Maintenance
    Feasibility of 3D Printing Applications for Highway Infrastructure Construction and Maintenance
    Schagen, B D ;
    Zhang, S.
    2024-08-01 | PDF
    In recent years there has been a significant increase of interest in additive manufacturing (AM; also frequently referred to as 3D printing), yet AM is largely unexplored within infrastructure projects. By harnessing the new capabilities of AM, researchers have managed to access unprecedented new design capabilities and operational flexibility (e.g ...
  • 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 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 ...
  • 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 ...
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