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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 1441 - 1460 of 36873 results
  • Traffic Safety Facts 2022 Data Bicyclists and Other Cyclists
    Traffic Safety Facts 2022 Data: Bicyclists and Other Cyclists
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 1,105 pedalcyclist fatalities, accounting for 2.6 percent of all traffic fatalities. In 2022 there was a 13-percent increase in pedalcyclists killed (1,105) from the 976 pedalcyclists killed in 2021. In 2022 an estimated 46,195 pedalcyclists were injured, an 11-percent increase from 41,615 pedalcyclists injured in 2021. In 2022 t ...
  • Expanding Connected Vehicle Data Sources to Increase Applications and Use on Texas Roadways
    Expanding Connected Vehicle Data Sources to Increase Applications and Use on Texas Roadways
    McAuley, Anna ;
    Gold, Andrea
    2024-07-01 | PDF
    As connected freight and passenger vehicles become increasingly present on Texas roadways, the need for real-time, accurate, and cohesive data is growing. In some cases, this data is reliable and readily available to public agencies. In other cases, there are gaps in data availability or quality. A connected vehicle data framework (CVDF) enables th ...
  • Impacts of Autonomous TruckMounted Attenuator ATMA on INDOT Work Zone Safety Mobility and Worker Productivity
    Impacts of Autonomous Truck-Mounted Attenuator (ATMA) on INDOT Work Zone Safety, Mobility, and Worker Productivity
    Tian, Chi ;
    Feng, Yiheng
    2024-07-01 | PDF
    Work zone safety has been a major concern for many stakeholders, including the state Departments of Transportation (DOTs). To prevent DOT workers, especially truck mounted attenuator (TMA) drivers, from injuries, the Autonomous Truck Mounted Attenuator (ATMA) technology was developed. To understand the current testing and deployment status of ATMA, ...
  • Developing QualityControlled Datasets and Methods to Assess the Impact of Rain on Snow Events on Nevada Highways
    Developing Quality-Controlled Datasets and Methods to Assess the Impact of Rain on Snow Events on Nevada Highways
    Heggli, Anne ;
    Bean, Brennan
    2024-07-01 | PDF
    The most damaging effects of rain-on-snow (ROS) events are often the result of excess water flows disrupting downstream infrastructure. While rain on snow events have been well studied in previous literature, there exists little research that quantifies the impact of ROS events on infrastructure. This report outlines efforts to explore the influenc ...
  • Induced Travel Estimation Revisited
    Induced Travel Estimation Revisited
    Manville, Michael
    ORCID ICON IMG
    2024-07-01 | PDF
    Suppose a government adds two lanes to a highway in both directions but then restricts access to those lanes. The lanes will be “managed”—open only to people in carpools, or to people in single-occupancy vehicles who pay a toll. The toll will vary in response to demand, with the goal of avoiding congestion and keeping vehicles moving. Will the tota ...
  • Peaked Too Soon Analyzing the Shifting Patterns of PM Peak Period Travel in Southern California
    Peaked Too Soon? Analyzing the Shifting Patterns of PM Peak Period Travel in Southern California
    Speroni, Samuel ;
    Siddiq, Fariba
    2024-07-01 | PDF
    Daily vehicle travel collapsed with the onset of the COVID-19 pandemic in early 2020 but largely bounced back by late 2021. The pandemic caused dramatic changes to working, schooling, shopping, and leisure activities, and to the travel associated with them. Several of these changes have so far proven enduring. So, while overall vehicle travel had l ...
  • Striping Program
    Striping Program
    Brown, Henry ;
    Edara, Praveen
    2024-07-01 | PDF
    The use of wider (greater than 4 in) edge line pavement markings is recognized as a proven safety countermeasure by the Federal Highway Administration (FHWA). However, providing wider edge lines can pose challenges due to budget and striping capacity constraints. One strategy that could be used to address the capacity constraints involves reducing ...
  • Developing a CrossAsset Allocation Mechanism
    Developing a Cross-Asset Allocation Mechanism
    Wilcoxson, Jon ;
    Gibson, Bryan
    2024-07-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) has developed several tools and methods to compare the value of proposed projects within specific programs and asset classes, including the Enhanced Bridge Prioritization Index, Enhanced Pavement Prioritization Index, and the Strategic Highway Investment Formula for Tomorrow (SHIFT). Although immensely val ...
  • Evaluation of LowQuality Recycled Concrete Pavement Aggregates for Portland CementTreated Base
    Evaluation of Low-Quality Recycled Concrete Pavement Aggregates for Portland Cement-Treated Base
    Daily, Koby ;
    Jones, Christopher
    2024-07-01 | PDF
    The Kansas Department of Transportation (KDOT) has begun to explore the incorporation of recycled concrete aggregates (RCAs) into portland cement-treated base (PCTB). KDOT currently employs a freeze-thaw method that includes 90 days of curing and 660 freeze-thaw cycles to determine the durability of concrete mixtures for pavements and stabilized ba ...
  • DOT Report to Congress Decarbonizing US Transportation
    DOT Report to Congress: Decarbonizing U.S. Transportation
    United States. Department of Transportation
    2024-07-01 | PDF
    The transportation sector accounts for about one third of U.S. greenhouse gas (GHG) emissions, more than any other individual sector of the economy. Decarbonizing transportation is critical to addressing the climate crisis and meeting the national goal of net-zero GHG emissions by 2050 and the interim target of 50-52 percent below 2005 levels by 20 ...
  • Review of LowClearance Early Warning Device Options for Illinois
    Review of Low-Clearance Early Warning Device Options for Illinois
    Sai, Shang ;
    Ouyang, Yanfeng
    2024-07-01 | PDF
    Bridge or tunnel strikes by over-height vehicles are a challenge to the transportation industry. This problem causes significant economic and social losses to the transportation industry. Low-clearance detection warning (LCDW) is one of the important technological means to address this issue. This research project was sponsored by Illinois Departme ...
  • DataDriven Approaches for Transit Capital Planning
    Data-Driven Approaches for Transit Capital Planning
    Gonzales, Eric J. ;
    Armstrong, Price
    2024-07-01 | PDF
    Transparent and repeatable processes are needed to forecast needs and prioritize capital investments across 15 Regional Transit Authorities (RTAs) in Massachusetts for the Capital Investment Plan (CIP). The MassDOT Rail and Transit Division (RTD) must allocate scarce capital funding to the RTAs by selecting capital projects for inclusion in the Sta ...
  • North Dakota Statewide Traffic Safety Survey 2024 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2024: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2024-07-01 | PDF
    The United States trails other developed countries in several transportation safety metrics. One metric, road traffic death rate, is higher than in other developed countries (World Health Organization 2024) (Figure 1.1). Progress has been made to reduce the number of traffic-related fatalities, but crashes resulting in death, injury, and property d ...
  • Developing a Hazard Detection and Alert System To Prevent Incidents Research Summary
    Developing a Hazard Detection and Alert System To Prevent Incidents [Research Summary]
    Song, Sejun
    2024-07-01 | PDF
    In this study, the project team aimed to develop a cost-effective, user-friendly, adaptable, accurate, and reliable bi-directional warning system that leveraged advanced Bluetooth-based device-to-device direct communication (beacon) technologies tailored for work zones. This system incorporated a lightweight wearable proximity sensor, a beacon comm ...
  • Assessing the Flood Reduction Benefits of OnRoad Structures Tech Transfer Summary
    Assessing the Flood Reduction Benefits of On-Road Structures [Tech Transfer Summary]
    Weber, Larry ;
    Arenas Amado, Antonio
    2024-07-01 | PDF
    Iowa lacks a detailed statewide geospatial database identifying which existing culverts are suitable candidates for conversion to ORS. Additionally, a HUC12-scale assessment of the potential for peak flow reductions offered by a system of ORS has not yet been conducted. To address these gaps, this project integrated geographic information system (G ...
  • The Grand Iron Range CAV Initiative History Partnerships and Community Engagement
    The Grand Iron Range CAV Initiative: History, Partnerships, and Community Engagement
    Douma, Frank ;
    Weiner, Evelyn
    2024-07-01 | PDF
    In fall 2022, a first-of-its-kind connected and automated vehicle (CAV) pilot program called goMARTI (Minnesota’s Autonomous Rural Transit Initiative) was launched as a collaborative effort between numerous partners. The 18-month pilot offers free, on-demand rides to area residents and visitors using five autonomous shuttle vans (including three wh ...
  • OSTR Research Roundup Newsletter July 2024
    OST-R Research Roundup Newsletter: July 2024
    United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology
    2024-07-01 | OST-R Research Roundup | PDF
    News from across OST-R and its research community.
  • Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas BridgesVolume 2 Reinforced Concrete Bridges
    Evaluation of Corrosion Prevention and Mitigation Approaches Used on Texas Bridges—Volume 2: Reinforced Concrete Bridges
    Hurlebaus, Stefan ;
    Birely, Anna C.
    2024-07-01 | PDF
    Corrosion in reinforced concrete is a self-accelerating process. As rust forms on steel, it enlarges in size and exerts tension on concrete, causing cracks and further corrosion in steel. The Texas Department of Transportation spends millions of dollars every year for repair and maintenance of concrete bridges; thus, a comprehensive study is essent ...
  • Traffic Safety Facts 2022 Data Young Drivers
    Traffic Safety Facts 2022 Data: Young Drivers
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2024-07-01 | PDF
    In 2022 there were 2,034 young drivers who died in traffic crashes, a 5-percent decrease from 2,133 in 2021. The number of licensed young drivers increased by 0.3 percent from 2021 to 2022. In 2022 there were an estimated 180,353 young drivers injured in traffic crashes, a decrease of 11 percent from 203,276 in 2021. The term young driver refers to ...
  • Local Verification of AASHTOWareTM Pavement ME Design for Flexible Pavement
    Local Verification of AASHTOWareTM Pavement ME Design for Flexible Pavement
    Tran, Nam ;
    Ajede, Akeem
    2024-07-01 | PDF
    This research project conducted a local verification to assess the accuracy of globally calibrated Pavement ME Design distress and smoothness models for asphalt pavements in Alabama. Pavement sections included LTPP test sections in Alabama and neighboring states, as well as sections tested at the NCAT Test Track. Results showed significant bias in ...
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