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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 3361 - 3380 of 36873 results
  • Inventorying San Francisco Bay Area Parking Spaces Technical Report Describing Objectives Methods and Results
    Inventorying San Francisco Bay Area Parking Spaces: Technical Report Describing Objectives, Methods, and Results
    Chester, Mikhail ;
    Helmrich, Alysha
    2022-02-01 | PDF
    The San Francisco Bay Area is one of the most progressive transportation regions in the deployment of high-capacity transit and use of policies to encourage active transportation. Yet like many other metro regions, there remains a dearth of knowledge on the abundance and location of parking infrastructure supply. Parking infrastructure remains one ...
  • Design of an Alternative Work Zone Attenuator Device
    Design of an Alternative Work Zone Attenuator Device
    Mandokhot, Mohit ;
    Karanjkar, Sayali
    2022-02-01 | PDF
    ODOT currently uses dump-trucks as shadow vehicles to mount crash attenuators in a Work Zone. When used in work zones, these dump trucks may become damaged under a crash, which may render them unavailable to support other operations. Additionally, an assessment of other nuanced facets such as shadow vehicle operator safety, safety of work zone occu ...
  • Design of an Alternative Work Zone Attenuator Device Fact Sheet
    Design of an Alternative Work Zone Attenuator Device [Fact Sheet]
    Mandokhot, Mohit ;
    Karanjkar, Sayali
    2022-02-01 | PDF
    ODOT currently uses dump-trucks as shadow vehicles to mount crash attenuators in a Work Zone. When used in work zones, these dump trucks may become damaged under a crash, which may render them unavailable to support other operations. Additionally, an assessment of other nuanced facets such as shadow vehicle operator safety, safety of work zone occu ...
  • Performance Evaluation of Connected Vehicle CV and Transportation Systems Management and Operations TSMO Projects in Florida
    Performance Evaluation of Connected Vehicle (CV) and Transportation Systems Management and Operations (TSM&O) Projects in Florida
    Alluri, Priyanka ;
    Salum, Jimoku H
    2022-02-01 | PDF
    Connected vehicle (CV) technologies and Transportation Systems Management and Operations (TSM&O) strategies are increasingly being considered by transportation agencies to improve the safety and mobility of the transportation network. To fully understand the potential benefits of CV and TSM&O initiatives, it is crucial to not only identify the perf ...
  • Developing an Implementation Strategy for Virginia Department of Transportation Pavement Rehabilitation Design Using MechanisticEmpirical Concepts
    Developing an Implementation Strategy for Virginia Department of Transportation Pavement Rehabilitation Design Using Mechanistic-Empirical Concepts
    Nair, Harikrishnan ;
    Saha, Bipad
    2022-02-01 | PDF
    The Mechanistic-Empirical Pavement Design Guide (MEPDG) was developed with an objective to provide the highway community with a state-of-the-practice tool for the design of new and rehabilitated pavement structures. The Virginia Department of Transportation (VDOT) officially adopted the MEPDG for new construction for interstate and primary routes e ...
  • Prediction Model of VibrationInduced Settlement Due to Pile Driving
    Prediction Model of Vibration-Induced Settlement Due to Pile Driving
    Arboleda-Monsalve, Luis G. ;
    Nam, Boo Hyun
    2022-02-01 | PDF
    This report presents a method for predicting ground deformations caused by impact pile driving, which accounts explicitly for the attenuation characteristics of Central Florida-specific soil conditions. Currently, vibration limits are not linked to the amount of pile driving-induced deformations that soils will experience due to vibrations, which i ...
  • Supply Chain Assessment of the Transportation Industrial Base Freight and Logistics
    Supply Chain Assessment of the Transportation Industrial Base: Freight and Logistics
    United States. Department of Transportation
    2022-02-01 | PDF
    The U.S. Department of Transportation (USDOT) developed this Freight and Logistics Supply Chain Assessment in response to Executive Order 14017: America’s Supply Chains. This sectoral assessment of the freight industrial base identifies and addresses current transportation supply chain vulnerabilities and challenges. It also identifies potential po ...
    Supporting Files
  • Pack Rust Mitigation Strategy Effectiveness
    Pack Rust: Mitigation Strategy Effectiveness
    Soriano Somarriba, Edgar Oscary ;
    Bowman, Mark D.
    2022-02-01 | PDF
    As of 2013, the damage caused by corrosion on highway bridges has been estimated to cost approximately 14 billion dollars annually, and this cost has been increasing over the years. Corrosion is one of the natural phenomena that has been slowly deteriorating infrastructure systems across the United States. One of the most problematic types of corro ...
  • Earth Pressure Assessment and Optimization of Type7 GRS Walls Earth Pressure for Type7 GRS Wall
    Earth Pressure Assessment and Optimization of Type-7 GRS Walls – Earth Pressure for Type-7 GRS Wall
    Chang, Nien-Yin ;
    Nghiem, Hien Manh
    2022-02-01 | PDF
    The construction of Type-7 Barrier Geosynthetic Reinforced Soil Wall (T7B-GRSW), much like bridge abutments, bridge approach, and retaining walls, the adoption of Geosynthetic Reinforced Soil (GRS) technology provides much-needed space-saving. In the early 20th century, before the invention of GRS (or MSE) technology, earth retaining structures had ...
  • Remaining Service Life Asset Measure Phase 2
    Remaining Service Life Asset Measure, Phase 2
    Matias de Oliveira, Jhenyffer ;
    Khani, Alireza
    2022-02-01 | PDF
    The main objectives of phase 2 of this project were to obtain relevant data to calculate the percent remaining service life interval (PRSI) and two additional metrics and to perform Markov chain analysis and dynamic programming to determine how much time and funding is required to bring the system to a stable configuration, which allows for more co ...
  • Use of Recycled Concrete Aggregate in Concrete Pavement Mixes
    Use of Recycled Concrete Aggregate in Concrete Pavement Mixes
    Yang, Zhifu ;
    Overall, Kevin
    2022-01-31 | PDF
    Natural virgin aggregates (NVAs)have become gradually exhausted across the state of Tennessee. There is a growing need for the Tennessee Department of Transportation (TDOT) to replace NVAs with more sustainable recycled concrete aggregates (RCAs).It is the intention of the project to quantitatively assess various RCAs available in Tennessee and to ...
  • Development of Cracking Condition Assessment System for Concrete Bridge Decks Using Image Processing Techniques
    Development of Cracking Condition Assessment System for Concrete Bridge Decks Using Image Processing Techniques
    Zhou, Shanglian ;
    Song, Wei
    2022-01-31 | PDF
    Modern society requires a sustainable, robust, and serviceable infrastructure system to promote social welfare and boost economy. To support such an infrastructure system, an efficient health monitoring framework is needed which can promptly detect the presence of defects and perform associated rehabilitation and maintenance. In civil infrastructur ...
  • DeepHyd A Deep LearningBased Artificial Intelligence Approach for the Automated Classification of Hydraulic Structures From LiDAR and Sonar Data
    DeepHyd: A Deep Learning-Based Artificial Intelligence Approach for the Automated Classification of Hydraulic Structures From LiDAR and Sonar Data
    Tang, Wenwu ;
    Chen, Shen-En
    2022-01-30 | PDF
    Monitoring the conditions of hydraulic structures such as bridges and culverts is essential in warranting the safety and sustainability of transportation infrastructure. This is particularly important for North Carolina as more than 8 percent of NC bridges have been found in poor conditions and need immediate maintenance. Lidar and sonar technologi ...
  • Synthesis of National Best Practices on Pedestrian and Bicycle Design Guidance and Technology Innovations
    Synthesis of National Best Practices on Pedestrian and Bicycle Design, Guidance, and Technology Innovations
    Gates, Timothy ;
    Qu, Tongbin Teresa
    2022-01-27 | PDF
    In order to accelerate progress towards the state’s Towards Zero Death vision, MDOT sponsored this research effort, Synthesis of National Best Practices on Pedestrian and Bicycle Design, Guidance, and Technology Innovations(OR19-072). The primary goal of this project was to assess national best practices related to pedestrian and bicyclist planning ...
  • Evolution of Pavement Friction and Macrotexture after Asphalt Overlay
    Evolution of Pavement Friction and Macrotexture after Asphalt Overlay
    Underwood, B. Shane ;
    Castorena, Cassie
    2022-01-26 | PDF
    A trend of observed increases in both the number and rate of total and wet crashes after resurfacing projects has become a safety concern for the NCDOT. Wet collision rates may increase due to a reduction in skid resistance under wet conditions. The precise amount of loss is dependent on many factors, but the consensus among experts is that pavemen ...
  • Calibration of Structural Layer Coefficients for North Carolina Asphalt Pavements
    Calibration of Structural Layer Coefficients for North Carolina Asphalt Pavements
    Underwood, B. Shane ;
    Castorena, Cassie
    2022-01-26 | PDF
    The North Carolina Department of Transportation (NCDOT) uses the 1993 AASHTO Guide for Design of Pavement Structures to determine the minimum pavement stiffness that will ensure pavement longevity. For design, the contribution from any given layer is calculated by the product of that layer’s thickness and a structural layer coefficient that capture ...
  • Evaluation of Dynamic Speed Feedback Signs on Freeway Interchange Ramps
    Evaluation of Dynamic Speed Feedback Signs on Freeway Interchange Ramps
    Gates, Timothy J. ;
    Mahmud, Md Shakir
    2022-01-23 | PDF
    Dynamic speed feedback signs (DSFS) are promising countermeasure to reduce curve speeds and subsequent lane departures at freeway interchange ramps, although their use in such contexts has been limited. Consequently, the impact of DSFS on driver performance at interchange ramps remains unproven. To that end, research was performed to determine the ...
  • Automatic Road Feature Extraction from StateOwned Mobile LiDAR Data for Traffic Safety Analysis and Evaluation
    Automatic Road Feature Extraction from State-Owned Mobile LiDAR Data for Traffic Safety Analysis and Evaluation
    Xu, Hao ;
    Weston, James
    2022-01-20 | PDF
    The mobile LiDAR data is a promising solution to the existing road feature data gap based on its high accuracy and extended road network coverage. However, because of the lack of an automatic measuring tool, road features are currently read by data operators and measured manually in the cloud points. This project developed an ArcGIS toolbox—Automat ...
  • Quantifying Correlations Between Winter Severity Road Conditions and VTrans Snow and Ice Control Activities Final Report
    Quantifying Correlations Between Winter Severity, Road Conditions, and VTrans’ Snow and Ice Control Activities: Final Report
    Dowds, Jonathan ;
    Sullivan, James L.
    2022-01-19 | PDF
    Season-to-season variability in winter weather and the absence of quantifiable methods for measuring either winter severity or snow and ice control (SIC) performance have made planning and budgeting for SIC activities challenging. Recent research initiatives undertaken by VTrans and other snowbelt DOTs have established objective measures for weathe ...
  • Needed Skills in the Transportation Workforce in the Context of New and Emerging Technologies and Approaches
    Needed Skills in the Transportation Workforce, in the Context of New and Emerging Technologies and Approaches
    Wickland, Teo
    ORCID ICON IMG
    2022-01-01 | PDF
    The United States’ transportation workforce is currently at a skills deficit in key areas. New and innovative transportation technologies and approaches threaten to exacerbate this situation. Yet, transportation workers need more than skills to implement new technologies: they need the skills to critically determine which technologies are likely to ...
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