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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 1521 - 1540 of 35452 results
  • 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 ...
  • Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS Tech Summary
    Correlation of Rut Depths Measured by the Profilers of LTRC and DOTD PMS [Tech Summary]
    Chen, Qiming
    2023-08-01 | PDF
    The objective of this research was to develop a correlation of rut depths measured with LTRC’s profiler with a 5-point laser system and DOTD PMS’s profiler with a scanning laser system. A standard operating procedure (SOP) of pavement rutting data collection, compilation, and delivery by LTRC was developed so that DOTD pavement engineers can use LT ...
  • Evaluating Pavements Designed for Longer Life Brief
    Evaluating Pavements Designed for Longer Life [Brief]
    Kutay, M. Emin
    2023-08-01 | PDF
    A 2015 state law directed the Michigan Department of Transportation (MDOT) to explore innovations that can help pavements last longer and require less maintenance. To accomplish the task, the agency designed and constructed four projects using top-of-the-line materials and building methods. The completed roads are predicted to have service lives th ...
  • Incorporating the Site Variability and Laboratory InSitu Testing Variability of Soil Properties in Geotechnical Engineering Design Tech Summary
    Incorporating the Site Variability and Laboratory/ In-Situ Testing Variability of Soil Properties in Geotechnical Engineering Design [Tech Summary]
    Abu-Farsakh, Murad ;
    Zhang, Zhongjie “Doc”
    2023-08-01 | PDF
    The main objective of this research is to: Evaluate the operator-induced and equipment-induced variations on design soil properties; Evaluate the site spatial variations of design soil properties; Evaluate the best spatial interpolation method to generate synthetic CPT profiles and soil boring data from the existing CPT and soil boring data of the ...
  • Valuation Methodology and Framework for Estimation of RightofWay Value
    Valuation Methodology and Framework for Estimation of Right-of-Way Value
    Kraus, Edgar ;
    Holik, William
    2023-08-01 | PDF
    TxDOT manages over one million acres of right-of-way, which is used by a variety of third parties to install facilities such as utilities, saltwater pipelines, and small cell nodes. Third parties include common carriers, who install facilities for public use, and private parties, who install facilities for private use. Common carriers access the ri ...
  • Determining Sample Measures of Distracted Driving Distracted Pedestrian Activities and Impacts of Such Behavior on Traffic Operations at Signalized Intersections Brief
    Determining Sample Measures of Distracted Driving, Distracted Pedestrian Activities and Impacts of Such Behavior on Traffic Operations at Signalized Intersections [Brief]
    Ballard, Tricia (Labud) ;
    Abou-Senna, Hatem
    2023-08-01 | PDF
    How much time is lost due to traveler distraction? Florida law prohibits texting while a vehicle is moving, but how much travel delay is caused by drivers looking at their phone while stopped at a traffic light or a pedestrian responding to a text message while traversing a crosswalk?
  • Improving Safety Service Patrol Performance
    Improving Safety Service Patrol Performance
    Cetin, Mecit ;
    Yang, Hong
    2023-08-01 | PDF
    Safety Service Patrols (SSPs) provide motorists with assistance free of charge on most freeways and some key primary roads in Virginia. This research project is focused on developing a tool to help the Virginia Department of Transportation (VDOT) optimize SSP routes and schedules (hereafter called SSP-OPT). The computational tool, SSP-OPT, takes re ...
  • Study of Operational and Safety Impacts of Disabled and Abandoned Vehicles on FDOT Roadways Summary
    Study of Operational and Safety Impacts of Disabled and Abandoned Vehicles on FDOT Roadways [Summary]
    Gordin, Eric ;
    Al-Deek, Haitham
    2023-08-01 | PDF
    A primary goal of the Florida Department of Transportation (FDOT) is to keep vehicles moving safely. But what are the safety impacts of vehicles that are not moving – particularly disabled and abandoned vehicles (DAVs)? From 2015-2020, DAVs were involved in 1,250 crashes in Florida, resulting in 53 fatalities, 976 injuries, $17.3 million in propert ...
  • Evaluation of FDOT Corrosion Prevention and Control Programs Summary
    Evaluation of FDOT Corrosion Prevention and Control Programs [Summary]
    Duncan, Matthew ;
    Fadden, Matthew
    2023-08-01 | PDF
    This research reviewed commonly used materials and systems to evaluate and compare multiple practices and systems used across the State in terms of durability, cost, and long-term performance. Additionally, this project summarized current FDOT design requirements and specifications regarding corrosion control for reinforced concrete bridge structur ...
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