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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 2261 - 2280 of 36873 results
  • Exploring PerformanceBased Contracts A Good Option to Address LongTerm Road Maintenance in California Research Brief
    Exploring Performance-Based Contracts: A Good Option to Address Long-Term Road Maintenance in California? [Research Brief]
    Calahorra-Jimenez, Maria ;
    Poythress, Richard
    2023-07-01 | PDF
    The 2019 Report Card for California’s infrastructure indicates that California has the second worst roads in the country: “(55%) of the major urban roads in California are in poor condition.” This report indicates that S.B. (1)— which aims to “fix neighborhood streets, freeways, and bridges in communities across California” provides the revenue nee ...
  • Understanding Mobility Needs for Older Adults in Wisconsin
    Understanding Mobility Needs for Older Adults in Wisconsin
    Schrader, Michael ;
    Han, Dahai
    2023-07-01 | PDF
    The Wisconsin Department of Health Services predicts a 72% increase in the population aged 65 and older in the state by 2040, indicating a growing demand for alternative transportation services. To address this need and support healthy aging, this research project was conducted to gather data on the travel patterns, challenges, and recommendations ...
  • Mitigation of ChlorideInduced Corrosion through Chemisorption
    Mitigation of Chloride-Induced Corrosion through Chemisorption
    Yellavajjala, Ravi Kiran ;
    Sajid, Hizb Ullah
    2023-07-01 | PDF
    Salt brine deicing solution contains chloride ions that can penetrate the passive layer and cause corrosion in rebars. While epoxy coatings are effective, they can be easily damaged during transportation and construction. In addition, aggressive localized corrosion is observed in damaged epoxy coated rebars. To address this issue, this project aims ...
    Supporting Files
  • 2023 Research Peer Exchange Transportation Pooled Funds Data Curation and Promoting Research Culture
    2023 Research Peer Exchange: Transportation Pooled Funds, Data Curation, and Promoting Research Culture
    Range, Jeffrey ;
    Hickey, Laura
    2023-07-01 | PDF
    Colorado Department of Transportation (CDOT) hosted a two-day Peer Exchange at the CDOT headquarters in Denver, Colorado on February 28 and March 1, 2023. Representatives from Colorado, Idaho, Missouri, Maryland, Vermont, Federal Highway Administration, and the National Transportation Library participated. This peer exchange focused on the discussi ...
  • Cold InPlace Recycling Project Selection and Guidance for Iowa Roadways
    Cold In-Place Recycling Project Selection and Guidance for Iowa Roadways
    Buss, Ashley ;
    Pinto, Irvin
    2023-07-01 | PDF
    Analysis of 44 CIR pavement projects from the Iowa Pavement Management Information System database showed that rutting was the distress that triggered performance concerns first, followed by longitudinal wheel path cracking and transverse cracking. Pavement distress indices typically dropped below trigger values 10 to 15 years after CIR rehabilitat ...
  • Seat Belt Use in 2022 Use Rates in the States and Territories Traffic Safety Facts Crash Stats
    Seat Belt Use in 2022 — Use Rates in the States and Territories [Traffic Safety Facts - Crash Stats]
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2023-07-01 | PDF
    In 2022 seat belt use in the United States ranged from 67 percent in the U.S. Virgin Islands to 96.5 percent in Oregon. Twenty-six 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 the ...
  • Truck Parking Investments for Missouri
    Truck Parking Investments for Missouri
    Kirk, Katie ;
    Andersen, Dan
    2023-07-01 | PDF
    Missouri’s multimodal freight system is critical to the health of both the state and national economy, and as the economy and population grow, goods movement activity is expected to increase. This growing demand for goods will likely mean more trucks on the road, leading to a greater need to enhance the infrastructure necessary for trucks to improv ...
  • MASH TL4 Engineering Analyses and Detailing of 36In And 42In High Median Barriers for LADOTD
    MASH TL-4 Engineering Analyses and Detailing of 36-In. And 42-In. High Median Barriers for LADOTD
    Williams, William F. ;
    Cui, Jilong
    2023-07-01 | PDF
    Single-slope median barriers are currently planned for several bridges in Louisiana. For these bridges, both 36-in. and 42-in. designs were developed and considered as part of this project. Both barrier designs can be used near a longitudinal joint that is approximately 1 in. wide. The 36-in. high barrier is similar to the single-slope traffic rail ...
  • Quick Facts 2021
    Quick Facts 2021
    United States. Department of Transportation. National Highway Traffic Safety Administration
    2023-07-01 | PDF
    Quick reference of 2021 traffic safety numbers and statistics.
  • MASH TL4 Engineering Analyses and Detailing of 36Inch and 42Inch High Median Barriers for LADOTD Tech Summary
    MASH TL-4 Engineering Analyses and Detailing of 36-Inch and 42-Inch High Median Barriers for LADOTD [Tech Summary]
    Williams, William
    2023-07-01 | PDF
    The objective of this research was to analyze the strengths of the four proposed retrofit designs considered for this project in accordance with AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications Section 13 for MASH TL-4 impact conditions. These designs are briefly described below and shown in Figure 1 (36-in. median barri ...
  • Quality Review and Assessment of Pavement Condition Survey Vehicle Data Across New England
    Quality Review and Assessment of Pavement Condition Survey Vehicle Data Across New England
    Rada, Gonzalo ;
    Simpson, Amy
    2023-07-01 | PDF
    The New England Transportation Consortium (NETC) members spend significant time and resources on pavement surface condition data collection in support of a wide range of reporting and decision-making functions. Quality data are of critical importance to these functions—as the adage goes, “garbage in, garbage out.” The data quality management plans ...
  • Integrating Transformative Technologies in Indianas Transportation Operations
    Integrating Transformative Technologies in Indiana’s Transportation Operations
    Walker, Jasmine ;
    Li, Yujie
    2023-07-01 | PDF
    New and emerging transportation technologies, driven by automation, connectivity, and electrification, could potentially help address the transportation sector’s persistent and pervasive problems associated with safety, mobility, energy use, and so on. For this reason, the state of Indiana, uniquely positioned to serve nationwide interstate truck t ...
  • Implementation of Concrete Overlay Evaluation and Design
    Implementation of Concrete Overlay Evaluation and Design
    Koirala, Niwesh ;
    Hwang, Chuljin
    2023-07-01 | PDF
    The performance of 7-in CRCP overlay on CPCD in US 75 in Sherman, which was built in 2010, has been quite satisfactory. Encouraged by the satisfactory performance of the project, TxDOT Paris District decided to build another CRCP overlay on CPCD in US 82 in Paris. This project is in the westbound direction of US 82 – consisting of 2 main lanes and ...
  • Development of a Test to Quantify Organic Content in Silica Sand Summary
    Development of a Test to Quantify Organic Content in Silica Sand [Summary]
    Shoucair, John ;
    Morrison, Elise
    2023-07-01 | PDF
    The objective of this project was to determine whether a modifed Walkley Black test or elemental analysis of carbon test can be used as a substitute test for the AASHTO T21 or AASHTO T71 tests.
  • Evaluation of Nondestructive Test Pilot Projects Research Project Capsule 232B
    Evaluation of Non-destructive Test Pilot Projects: Research Project Capsule [23–2B]
    Akentuna, Moses ;
    Rupnow, Moses
    2023-07-01 | PDF
    The objective of this research is to collect and analyze data from non-destructive testing (NDT) pilot projects proposed in LTRC project 17-2B for implementation in section 502 of the Louisiana Standard Specifications for Roads and Bridges.
  • North Dakota Statewide Traffic Safety Survey 2023 Traffic Safety Performance Measures for State and Federal Agencies
    North Dakota Statewide Traffic Safety Survey, 2023: Traffic Safety Performance Measures for State and Federal Agencies
    Vachal, Kimberly ;
    Kubas, Andrew
    2023-07-01 | PDF
    The statewide driver traffic safety survey provides baseline metrics for the Highway Safety Division and others to use in understanding perceptions and self-reported behaviors related to focus issues. A core set of questions addressed nationally agreed upon priorities, including seat belts, impaired driving, and speeding. In addition to the core is ...
  • NETC Project 211 Quality Review and Assessment of Pavement Condition Survey Vehicle Data Across New England Pavement Data Quality Guidelines
    NETC Project 21–1: Quality Review and Assessment of Pavement Condition Survey Vehicle Data Across New England: Pavement Data Quality Guidelines
    New England Transportation Consortium
    2023-07-01 | PDF
    The New England Transportation Consortium (NETC) members consist of Maine (ME), Connecticut (CT), Massachusetts (MA), New Hampshire (NH), Rhode Island (RI), and Vermont (VT) transportation agencies. The member agencies spend a considerable amount of time and resources on pavement surface data collection. The data collected are used for a wide range ...
  • Open Framework Standards for Combined Aircraft Sensor Network for the State of Ohio to Detect and Track Lower Altitude Aircraft Fact Sheet
    Open Framework Standards for Combined Aircraft Sensor Network for the State of Ohio to Detect and Track Lower Altitude Aircraft [Fact Sheet]
    Calhoun, Sean ;
    Adami, Tony
    2023-07-01 | PDF
    As research, development and overall investment continues to accelerate the integration of Uncrewed Aircraft Systems (UAS or drones) into our skies, it is becoming ever more critical to develop supporting systems and services that are based on sound engineering and strategic planning. Reliable and robust airspace surveillance for the lower altitude ...
  • Economical Impact of Full Closure for Accelerated Bridge Construction and Conventional Staged Construction
    Economical Impact of Full Closure for Accelerated Bridge Construction and Conventional Staged Construction
    El-Rayes, Khaled ;
    El-Gohary, Nora
    2023-07-01 | PDF
    Accelerated bridge construction (ABC) methods have been increasingly used in recent years to reduce the impact of construction operations on traffic and mobility. ABC methods, however, often require a higher initial cost, more planning, and additional design coordination. Several tools have been developed to assist decision-makers in the selection ...
  • Use of Infrared Thermography for the Inspection of Welds in the Shop and Field Phase II
    Use of Infrared Thermography for the Inspection of Welds in the Shop and Field – Phase II
    Manuel, Michele
    2023-07-01 | PDF
    The research focused on demonstrating and implementing infrared thermography nondestructive technique (IR-TNDT) methods in-service for inspecting aluminum (Al) and steel welds in complex structures. The study was applied to in-shop and mock in-field conditions. After a thorough literature review, this report presents the qualification of defect man ...
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