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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 1781 - 1800 of 35865 results
  • Project Selection Guidance for Cold InPlace Recycled Pavements Brief
    Project Selection Guidance for Cold In-Place Recycled Pavements [Brief]
    Jahren, Charles ;
    Lee, Hosin David
    2023-07-01 | PDF
    Proper project selection is an important step in ensuring the success of a cold in-place recycling (CIR) project. As of 2023, CIR has been successfully used in Iowa for more than 30 years. However, it is important to first decide whether CIR is the correct solution for a given pavement project because of its limited effectiveness on roads with heav ...
  • Cold InPlace Recycling Project Selection and Guidance for Iowa Roadways Tech Transfer Summary
    Cold In-Place Recycling Project Selection and Guidance for Iowa Roadways [Tech Transfer Summary]
    Jahren, Chuck ;
    Lee, Hosin David
    2023-07-01 | PDF
    Cold in-place recycling (CIR) involves cold milling 3 to 4 in. of a deteriorated asphalt pavement, processing and stabilizing the millings, and relaying, compacting, curing, and covering with a hot-mix asphalt (HMA) overlay or (rarely in Iowa) a bituminous surface treatment. This report documents an investigation of CIR projects in Iowa with the ob ...
  • 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 ...
  • DashcamEnabled Deep Learning Applications for Airport Runway Pavement Distress Detection
    Dashcam-Enabled Deep Learning Applications for Airport Runway Pavement Distress Detection
    Malekloo, Arman ;
    Liu, Xiaoyue Cathy
    2023-07-01 | PDF
    Pavement distress detection plays a vital role in ensuring the safety and longevity of runway infrastructure. This project presents a comprehensive approach to automate distress detection and geolocation on runway pavement using state-of-the-art deep learning techniques. A Faster R-CNN model is trained to accurately identify and classify various di ...
  • Tapping Into Autonomous Trucking Data An Intelligent Routine Maintenance Framework for Texas
    Tapping Into Autonomous Trucking Data: An Intelligent Routine Maintenance Framework for Texas
    Chin, Kristie ;
    McAuley, Anna
    2023-07-01 | PDF
    Texas has become a major hub for autonomous trucking activity, with companies operating routes daily and continuing to expand operations onto new roadways. Equipped with high-definition cameras and sensor suites, autonomous trucks present a new data opportunity for the Texas Department of Transportation (TxDOT) to improve its routine maintenance op ...
  • Statewide Nonmotorized Traffic Monitoring Study Research Project Capsule 234SS
    Statewide Non-motorized Traffic Monitoring Study: Research Project Capsule [23–4SS]
    Bian, Ruijie “Rebecca” ;
    Rupnow, Tyson
    2023-07-01 | PDF
    The objectives of this research are to: 1. Consolidate non-motorized traffic data collected by LTRC/DOTD to date onto a GIS platform 2. Explore the possibilities of consolidating non-motorized traffic data collected by other public agencies onto the same GIS platform. 3. Refine expansion factors for short-term counters with additional data. 4. Eval ...
  • Effect of Longitudinal Joint Construction and Density on Asphalt Pavement Performance Phase I State of the Practice Research Project Capsule 233B
    Effect of Longitudinal Joint Construction and Density on Asphalt Pavement Performance— Phase I – State of the Practice: Research Project Capsule [23–3B]
    Akentuna, Moses ;
    Rupnow, Tyson
    2023-07-01 | PDF
    The objective of this study is conduct a literature review regarding the current best practices for longitudinal joint construction.
  • Effectiveness of Nonpharmaceutical Interventions to Avert the Second COVID19 Surge in Los Angeles County A Simulation Study
    Effectiveness of Nonpharmaceutical Interventions to Avert the Second COVID-19 Surge in Los Angeles County: A Simulation Study
    Rodier, Caroline ;
    Horn, Abigail
    2023-07-01 | PDF
    This study used a simulation to examine nonpharmaceutical interventions (NPIs) that could have been implemented early in a COVID-19 surge to avoid a large wave of infections, deaths, and an overwhelmed hospital system. The authors integrated a dynamic agent-based travel model with an infection dynamic model. Both models were developed with and cali ...
  • Aviation Fuels Exploring Low Carbon Options Under Current Policy
    Aviation Fuels – Exploring Low Carbon Options Under Current Policy
    Witcover, Julie ;
    Murphy, Colin
    2023-07-01 | PDF
    This paper reviews literature on technological, market, and policy factors affecting the growth of alternative aviation fuels. At present, they represent a minimal fraction of global aviation fuel used but are a critical tool for lowering GHG emissions from aviation. Even with electric and hydrogen power, substantial volumes of low-carbon liquid fu ...
  • UltraHighPerformance Concrete UHPC Use in Florida Structural Applications Summary
    Ultra-High-Performance Concrete (UHPC) Use in Florida Structural Applications [Summary]
    DeFord, Harvey “Dale” ;
    Riding, Kyle
    2023-07-01 | PDF
    The objective of this project was to establish mixing, placing, curing, and durability requirements and test methods necessary to produce durable, non-proprietary UHPC made using locally-sourced raw materials for different classes of structural use and exposure conditions.
  • Measuring Food Access to Improve Public Health
    Measuring Food Access to Improve Public Health
    Christofa, Eleni ;
    Gonzales, Eric J.
    2023-07-01 | PDF
    Food access is important due to its impact on public health outcomes. A food access metric proposed for four different transportation modes is the square footage of supermarkets that can be reached within 10 minutes travel time walking, biking, driving, and 30 minutes travel time by walk/transit. The spatial analysis is conducted for the centroids ...
  • 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 ...
  • One California Deployment Support
    One California Deployment Support
    Zhou, Kun ;
    Vu, Alexander
    2023-07-01 | PDF
    The One California team is supported by its academic partners at UC Berkeley PATH and UC Riverside CE-CERT. One California seeks to spur innovation, promote economic vitality, and protect precious natural resources through early adoption of CV systems and applications. Specifically, the One California team intends to improve traveler safety, mobili ...
  • Implementation of Retroreflective Pavement Markers RPMs in Rumble Strips as a Method to Enhance Driving Conditions After Snowplow Operations
    Implementation of Retroreflective Pavement Markers (RPMs) in Rumble Strips as a Method to Enhance Driving Conditions After Snowplow Operations
    Ferron, Raissa ;
    Rung, Michael
    2023-07-01 | PDF
    The absence of retroreflective raised pavement markers (RRPMs) due to snowplow operations leads to reduced road safety from lower visibility of the centerline and monetary losses from reinstalling the markers before the end of their service life. Multifunctionalization of rumble strips to serve as both a sensory warning to roadway users who have dr ...
    Supporting Files
  • DataDriven Methods to Assess Transportation System Resilience in Arkansas
    Data-Driven Methods to Assess Transportation System Resilience in Arkansas
    Hernandez, Sarah ;
    Mitra, Suman
    2023-07-01 | PDF
    The work described in this report proposes a foundational and repeatable resiliency assessment methodology to identify the most critical and vulnerable highway infrastructure assets. This study developed resiliency metrics that measure the overall network resiliency as a combination of the probability of disruptions in one or more of the network li ...
  • Intelligent Queue Length Estimation on Ramps Using Computer Vision and Machine Learning Algorithms
    Intelligent Queue Length Estimation on Ramps Using Computer Vision and Machine Learning Algorithms
    Tiwari, Sushant ;
    Rashidi, Abbas
    2023-07-01 | PDF
    Traffic sensors are utilized to capture real-time traffic parameters. Many Departments of Transportation in the United States use inductance loops. Induction loops often fail to give accurate results during highly congested periods, which is the most crucial time for ramp metering operations. Image processing and computer vision may provide an alte ...
  • Adaption of Drone Measurement Techniques to Roundabouts and Innovative Intersections
    Adaption of Drone Measurement Techniques to Roundabouts and Innovative Intersections
    Rodgers, Michael O. ;
    Wei, Anqi
    2023-07-01 | PDF
    With the advancement in drone data collection and computer-vision techniques, both inexpensive high-resolution video drones and commercial services that offer automatic drone video analysis have become accessible to most transportation agencies. Despite the great potential of using drone video data for the collection of traffic operational and safe ...
  • Salt Monitoring and Reporting Technology SMART for Salt Stockpile Inventory Reporting
    Salt Monitoring and Reporting Technology (SMART) for Salt Stockpile Inventory Reporting
    Mahlberg, Justin ;
    Manish, Raja
    2023-07-01 | PDF
    Transportation agencies in northern environments spend a considerable amount of their budget on salt for winter operations. For example, in the state of Indiana, there are approximately 120 salt storage facilities distributed throughout the state and the state expends between 30 M USD and 60 M USD on inventory and delivery each year. Historical tec ...
  • 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 ...
  • Transportation Options VMT Reduction Field Scan
    Transportation Options & VMT Reduction Field Scan
    McCahill, Chris ;
    Link, Megan
    2023-07-01 | PDF
    Minnesota has declared ambitious climate goals aimed at significantly reducing greenhouse gas emissions over the next thirty years, which it plans to accomplish partly through considerable reductions in the average vehicle miles traveled (VMT) per person. This will require close collaboration between local governments and the Minnesota Department o ...
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