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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 1681 - 1700 of 35865 results
  • 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 ...
  • Revised Load Rating Procedures for Deteriorated Prestressed Concrete Beams
    Revised Load Rating Procedures for Deteriorated Prestressed Concrete Beams
    Stripsky, Alex ;
    Breña, Sergio
    2023-08-01 | PDF
    The first prestressed concrete bridge in the United States was built in the early 1950s. Since then, several typical sections have been developed for use in bridge construction including I-beams, deck slabs, box beams, double tees, and so forth. In bridges under aggressive environments, corrosion deterioration of prestressing strands and stirrups h ...
  • Improving Multimodal Traffic Safety for MultiLane Arterials Summary
    Improving Multimodal Traffic Safety for Multi-Lane Arterials [Summary]
    Young, Brenda ;
    Abdel-Aty, Mohamad
    2023-08-01 | PDF
    This project sought to identify factors that impact crashes involving vulnerable road users and evaluate countermeasures that are most effective at managing speed on multi-lane arterials.
  • New Hampshire Department of Transportation Development of an Unmanned Aircraft Systems UAS Program
    New Hampshire Department of Transportation – Development of an Unmanned Aircraft Systems (UAS) Program
    WSP USA Inc.
    2023-08-01 | PDF
    Unmanned Aircraft Systems (UAS) are being used nationwide in an effort to improve safety, increase efficiency, increase quality, and reduce costs. A previous New Hampshire Department of Transportation (NHDOT) research project tested UAS technology to ascertain the ability to assist NHDOT with operations, development, and the execution of transporta ...
  • Domestic Airline Fares Consumer Report First Quarter 2023 Passenger and Fare Information
    Domestic Airline Fares Consumer Report: First Quarter 2023 Passenger and Fare Information
    United States. Department of Transportation
    2023-08-01 | Domestic Airline Fares Consumer Report | PDF
    Each month the Department of Transportation releases an Air Travel Consumer Report that includes information about various service quality elements, including flight delays, mishandled baggage, over sales, and a variety of other types of consumer complaints. In response to an increasing number of inquiries from consumers about domestic airline pric ...
  • Traffic Safety Facts 2021 Data Older Population
    Traffic Safety Facts 2021 Data: Older Population
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    In 2021 there were 7,489 people 65 and older killed in traffic crashes in the United States, accounting for 17 percent of all traffic fatalities. From 2020 to 2021 there was a 14-percent increase in the number of people 65 and older killed in traffic crashes. In 2021 there were 55.8 million people—17 percent of the total U.S. population—who were 65 ...
  • Traffic Safety Facts 2021 Data Young Drivers
    Traffic Safety Facts 2021 Data: Young Drivers
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    In 2021 there were 2,116 young drivers who died in traffic crashes, an 11-percent increase from 1,899 in 2020. The number of licensed young drivers increased by 1.3 percent from 2020 to 2021. In 2021 there were an estimated 203,256 young drivers injured in traffic crashes, an increase of 7 percent from 189,959 in 2020. Young drivers accounted for 8 ...
  • State Challenges to Improving Traffic Safety Coordination
    State Challenges to Improving Traffic Safety Coordination
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    This report is prepared in response to a requirement in House Report 117-99 (p. 61) that accompanies the Consolidated Appropriations Act, 2022 (Public Law 117-103), requesting information on what challenges States are facing with improving their traffic safety coordination. This report examines challenges States face improving traffic safety inform ...
  • Traffic Safety Facts Motorcycle Helmet Use in 2022Overall Results
    Traffic Safety Facts: Motorcycle Helmet Use in 2022—Overall Results
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-08-01 | PDF
    Use of DOT-compliant motorcycle helmets was 66.5 percent in 2022, not statistically different at the 0.05 level from 64.9 percent in 2021. This result is from the National Occupant Protection Use Survey (NOPUS), the only survey that provides nationwide, probability-based, observed data on motorcycle helmet use in the United States. The 2022 data co ...
  • Using Surface Geometry to Identify Potential Hydroplaning Locations
    Using Surface Geometry to Identify Potential Hydroplaning Locations
    Gurganus, Charles ;
    Devadas, Arvind
    2023-08-01 | PDF
    Hydroplaning occurs because of a series of unfortunate events that result from a combination of driver behavior, vehicle characteristics, and roadway features. Surface geometry and roadway texture are two variables within the control of the managing agency. This study identified hydroplaning vulnerable areas using mobile light detecting and ranging ...
  • Incorporating the Site Variability and LaboratoryInSitu Testing Variability of Soil Properties in Geotechnical Engineering Design
    Incorporating the Site Variability and Laboratory/In-Situ Testing Variability of Soil Properties in Geotechnical Engineering Design
    Abu-Farsakh, Murad ;
    Rahman, Md. Habibur
    2023-08-01 | PDF
    The properties of geomaterials usually vary from one location to another within the same site, in both the vertical and horizontal directions. The variability of soil properties is a complex phenomenon that results from several sources of uncertainties, including inherited spatial variability, measurement error, statistical error, and model bias er ...
  • Evaluation of Slurry Spreaders and Plows Underbody Wing and TwoWay Reversible
    Evaluation of Slurry Spreaders and Plows (Underbody, Wing and Two-Way Reversible)
    Hirt, Brian ;
    Waidley, Greg
    2023-08-01 | PDF
    MnDOT evaluated five pieces of new winter maintenance equipment: two slurry spreaders, an underbody scraper, a true-float wing plow and a two-way reversible plow. For Winter 1 of the evaluation program, all equipment was acquired, installed, and field-tested in MnDOT District 2. For Winter 2, a data collection program was developed to capture quant ...
  • Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS
    Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS
    Chen, Qiming ;
    Zhang, Zhongjie
    2023-08-01 | PDF
    This research study aimed at developing a correlation of rut depths measured with Louisiana Transportation Research Center's (LTRC’s) profiler with a 5-point laser system and Department of Transportation and Development (DOTD) Pavement Management System's (PMS’s) profiler with a scanning laser system. For this purpose, the transverse profile data c ...
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