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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 5721 - 5740 of 36958 results
  • Access Management Best Practices
    Access Management Best Practices
    Kirk, Adam ;
    Van Dyke, Chris
    2019-10-01 | PDF
    Research has persistently demonstrated that adopting a systematic access management framework improves highway operations and bolsters safety. Many state transportation agencies have adopted formal access management programs to systematize the application of access management techniques, however, the Kentucky Transportation Cabinet (KYTC) been unab ...
  • Concrete Bridge Deck Performance Data and Metrics for the State of Oregon
    Concrete Bridge Deck Performance Data and Metrics for the State of Oregon
    Wettach-Glosser, Jael ;
    Schumacher, Thomas
    2019-10-01 | PDF
    This report reviews the research on data and metrics related to concrete bridge deck performance for the state of Oregon. With guidance from the literature and ODOT personnel, two datasets were created with data currently available through ODOT and the NBI to evaluate concrete bridge deck performance. Using these datasets, a survival analysis was p ...
  • Connected Vehicle Corridor Deployment and Performance Measures for Assessment
    Connected Vehicle Corridor Deployment and Performance Measures for Assessment
    Li, Howell ;
    Mathew, Jijo K
    2019-10-01 | PDF
    In November 2016, the American Association of State Highway and Transportation Officials (AASHTO) announced the Signal Phase and Timing (SPaT) challenge to state and local agencies to kick start infrastructure deployments for V2I communications. The challenge involved the deployment of Dedicated Short Range Communication (DSRC) infrastructure with ...
  • CalibrationDevelopment of Safety Performance Functions for New Jersey
    Calibration/Development of Safety Performance Functions for New Jersey
    Ozbay, Kaan ;
    Nassif, Hani
    2019-10-01 | PDF
    Safety Performance Functions (SPFs) in the Highway Safety Manual (HSM) were developed using historic crash data collected in different states. Because local state or geographic conditions vary, to make the SPFs better accommodate the local data, two strategies are usually undertaken: the first strategy is to calibrate SPFs provided in HSM so that t ...
  • Commuter Bus Demand Incentives for Modal Shift and Impact on Greenhouse Gas Emissions Part II Service Delivery Concepts
    Commuter Bus Demand, Incentives for Modal Shift, and Impact on Greenhouse Gas Emissions: Part II – Service Delivery Concepts
    Gonzales, Eric J. ;
    Christofa, Eleni
    2019-10-01 | PDF
    This report is a continuation of a project to model and evaluate the potential to reduce greenhouse gas (GHG) emissions by expanding express commuter bus services in the Greater Boston area. First, data for socioeconomic factors in the Central Transportation Planning Staff (CTPS) travel demand model are collected to improve model accuracy. Second, ...
  • Rail Track Asset Management and Risk Management
    Rail Track Asset Management and Risk Management
    Zhang, Zhipeng ;
    Oladipo, Olufemi
    2019-10-01 | PDF
    The United States has the most extensive rail network in the world. Freight rail carries over 43% of ton-miles of goods and passenger rail transports millions of passengers annually. Track infrastructure is the most valuable asset to the rail industry. Also, track infrastructure quality is critical for rail safety and risk management. Despite billi ...
  • Traveler Information for the Commercial Vehicle Operations Community
    Traveler Information for the Commercial Vehicle Operations Community
    Flintsch, Alejandra Medina ;
    Li, Yingfeng (Eric)
    2019-10-01 | PDF
    Traveler information is critical for the safety and efficiency of commercial vehicle operations (CVO). The objectives of this project are to (a) review traveler information technologies and practices in Virginia, (b) understand CVO community information needs, (c) document data availability to support a CVO information system, and (d) recommend a f ...
  • Development of Automated Incident Detection System Using Existing ATMS CCTV
    Development of Automated Incident Detection System Using Existing ATMS CCTV
    Chen, Stanley ;
    Chen, Yaobin
    2019-10-01 | PDF
    Indiana Department of Transportation (INDOT) has over 300 digital cameras along highways in populated areas in Indiana. These cameras are used to monitor traffic conditions around the clock, all year round. Currently, the videos from these cameras are observed by human operators. The main objective of this research is to develop an automatic real-t ...
  • Freight Flows and Incident Management
    Freight Flows and Incident Management
    Khattak, Asad ;
    Li, Xiaobing
    2019-10-01 | PDF
    This study models and simulates vehicle behaviors based on large-scale traffic-incident congestion and the availability of Advanced Traveler Information Systems (ATIS). The study examines how well detours can help truck and passenger vehicle drivers avoid unexpected congestion and associated delay costs. En-route diversions could also decrease seco ...
  • RiskandReliabilityBased Approaches to Analyzing Road Geometric Design Criteria
    Risk-and-Reliability-Based Approaches to Analyzing Road Geometric Design Criteria
    Porter, Richard J. ;
    Musunuru, Anusha
    2019-10-01 | PDF
    Federal and state transportation agencies set goals related to surface transportation system performance. The variability in factors influencing design criteria (e.g., driver performance, road conditions, and vehicle performance) is often large and is addressed implicitly by using “conservative” values. However, a risk-and-reliability-based analysi ...
  • Deep Soil Test Borings to Determine Shear Wave Velocities Across South Carolina
    Deep Soil Test Borings to Determine Shear Wave Velocities Across South Carolina
    Sasanakul, Inthuorn ;
    Gassman, Sarah
    2019-10-01 | PDF
    Having an accurate shear wave velocity profile and a better understanding of dynamic behavior of the deep soil deposits in the South Carolina Coastal Plain are critical for seismic hazard analyses of critical transportation infrastructure. This research presents a study that obtained comprehensive field and laboratory measurements of shear wave vel ...
  • Incorporating Potential Climate Change Impacts in Bridge and Culvert Design
    Incorporating Potential Climate Change Impacts in Bridge and Culvert Design
    Morsy, Mohamed M. ;
    Shen, Yawen
    2019-10-01 | PDF
    This project examined the potential impact of changing climatic conditions on structural designs in Virginia. A methodology was developed for producing intensity-duration-frequency (IDF) curves verified against the standard Atlas 14 values. The results suggest increases in rainfall depth for a 24-hour rainfall event. The second objective used a 2-d ...
  • 2018 Assessment of the Practice of Public Involvement in Florida Summary
    2018 Assessment of the Practice of Public Involvement in Florida [Summary]
    Kramer, Jeff
    2019-10-01 | PDF
    University of South Florida researchers documented the state of practice of public involvement in transportation decision-making and provided an update to the 2006 report documenting public involvement in Florida.
  • Experimental and Computational Investigations of HighDensity Asphalt Mixtures
    Experimental and Computational Investigations of High-Density Asphalt Mixtures
    Marasteanu, Mihai O. ;
    Le, Jia-Liang
    2019-10-01 | PDF
    Compaction of asphalt mixtures represents a critical step in the construction process that significantly affects the performance and durability of asphalt pavements. In this research effort, the compaction process of asphalt mixtures was investigated using a combined experimental and computational approach. The primary goal was to understand the ma ...
  • Evaluation of Self Consolidating Concrete and Class IV Concrete Flow in Drilled Shafts
    Evaluation of Self Consolidating Concrete and Class IV Concrete Flow in Drilled Shafts
    Mullins, Gray ;
    Zayed, Abla
    2019-10-01 | PDF
    The term “mattressing” is a relatively new term coined by a joint task force formed by the Deep Foundation Institute and European Foundation Federation Committee (DFI/EFFC). Mattressing is defined as a pattern of creases on the surface of drilled shafts or slurry walls where the pattern reflects the reinforcing cage layout and which gives the appea ...
  • Use of Geosynthetics for Separation and Stabilization in LowVolume Roadways
    Use of Geosynthetics for Separation and Stabilization in Low-Volume Roadways
    Hoppe, Edward J ;
    Hossain, M Shabbir
    2019-10-01 | PDF
    The implementation of geosynthetics in road construction in the United States dates back to the 1970s. Although the benefits of these materials are widely recognized, actual design and construction practices are not universal. Guidelines for use are often developed locally based on specific field experience. Currently, the Virginia Department of Tr ...
  • Carbon Fiber Reinforced Polymer CFRP for Pretension Applications Material Acceptance Criteria and Advancing Anchorage Designs
    Carbon Fiber Reinforced Polymer (CFRP) for Pretension Applications: Material Acceptance Criteria and Advancing Anchorage Designs
    Tanks, Jonathon D ;
    Sharp, Stephen R
    2019-10-01 | PDF
    One of the main causes of structural deficiency in concrete bridges is the deterioration of the constituent materials. In order to achieve the goal of a design life of 75 to 100 years, it is imperative that pretensioned elements—girders, piles, and deck panels—contain corrosion-resistant or corrosion-free strands. The Virginia Department of Transpo ...
  • Laboratory and Outdoor Exposure Site Evaluations of Portland Limestone Cements
    Laboratory and Outdoor Exposure Site Evaluations of Portland Limestone Cements
    Garcia, Jose E ;
    Tiburzi, Nicolas N
    2019-10-01 | PDF
    The research described in this report was funded by the Texas Department of Transportation (TxDOT), with an emphasis on portland limestone cements (PLCs) with higher limestone contents (e.g., greater than 15%), particularly in paving applications. The project was quite comprehensive and included the full-scale production of seven different cements ...
  • TravelTime Reliability in Simulation and Planning Models Utah Case Study SHRP2 L04 IAP Round 7
    Travel-Time Reliability in Simulation and Planning Models: Utah Case Study (SHRP2 L04 IAP Round 7)
    Liu, Xiaoyue Cathy ;
    Haghighi, Nima
    2019-10-01 | PDF
    Travel-time reliability is a crucial indicator in transportation systems performance assessment. Previous studies mostly relied on historical detectors or trajectory data for reliability analysis; however, data availability and limited sample size create major obstacles for robust and comprehensive assessment. Moreover, such analysis that is only b ...
  • Modeling Framework for Socially Inclusive Bikesharing Services
    Modeling Framework for Socially Inclusive Bikesharing Services
    Qian, Xiaodong
    ORCID ICON IMG
    2019-10-01 | PDF
    Bikeshare programs are increasingly popular in the United States and they are an important part of sustainable transportation systems, offering a viable mode choice for many types of last-mile trips. This popularity means that an increasing number of people can enjoy the convenience of cycling and the associated physical health benefits without act ...
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