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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 5761 - 5780 of 36990 results
  • 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 ...
  • Development of a Mode Choice Model To Estimate Evacuation Transit Demand
    Development of a Mode Choice Model To Estimate Evacuation Transit Demand
    Wilmot, Chester ;
    Bian, Ruijie
    2019-10-01 | PDF
    Since Hurricane Katrina, transit evacuation service has been seen to serve critical needs in affected cities and an increasing number of hurricanes have struck the east coast where more people rely on public transportation to evacuate. Thus, it is important to model mode choice in evacuation for a better estimation of evacuation transit demand. In ...
  • SNIP Light User Manual
    SNIP Light User Manual
    Tarko, Andrew P. ;
    Thomaz, Jose E.
    2019-10-01 | PDF
    A systemic approach to identifying road locations that exhibit safety problems was provided by the Safety Needs Identification Program (SNIP and SNIP2) developed by the Purdue University Center for Road Safety (CRS). The new version SNIP Light has been developed to provide other uses with planning level traffic safety analysis capability for a wide ...
  • Sustainability and Resiliency of Concrete Rapid Repairs Utilizing Advanced Cementitious Materials FreezeThaw Loads
    Sustainability and Resiliency of Concrete Rapid Repairs Utilizing Advanced Cementitious Materials: Freeze/Thaw Loads
    Adams, Matthew P. ;
    Bandelt, Matthew J
    2019-10-01 | PDF
    This report provides a review of advanced cementitious materials that can be used in transportation infrastructure to resist freeze-thaw loading durability conditions. The report begins by providing a literature review of the mechanical and durability properties of rapid repair systems. A summary of discussion points held during a workshop held on ...
  • Nonlinear Dimension Reduction for Hybrid Track Quality
    Nonlinear Dimension Reduction for Hybrid Track Quality
    Lasisi, Ahmed ;
    Attoh-Okine, Nii
    2019-10-01 | PDF
    Rail geometry defects constitute a major cause of accidents in the United States. Geometry related accidents are often very severe and damaging. While rail geometry-caused derailments continue to increase according to Federal Railroad Administration (FRA) safety data, track quality analysis remains effectively unchanged. The use of TQI or track qua ...
  • Load Rating of Bridge LOG471184 Engineering Research Services 20172020 Task 5
    Load Rating of Bridge LOG-47-1184: Engineering Research Services 2017-2020 Task 5
    Khoury, Issam ;
    Steinberg, Eric
    2019-10-01 | PDF
    Bridge LOG-47-1184, a four-lane concrete highway bridge, was instrumented and subjected to controlled vehicle load testing in May 2019. The load response data collected were used to generate load Rating Factors (RFs) via a three-dimensional finite element model (FEM) created using ABAQUS, which were compared to those generated by MIDAS/Civil softwa ...
  • Connected Vehicle VehicletoInfrastructure Support of Active Traffic Management
    Connected Vehicle Vehicle-to-Infrastructure Support of Active Traffic Management
    Hadi, Mohammed ;
    Iqbal, Md Shahadat
    2019-10-01 | PDF
    Connected vehicle (CV) technologies promise transformative changes in Active Traffic Management (ATM) of freeways and arterials and have the potential to support Integrated Corridor Management (ICM). The goal of this project was to provide information to support the Florida Department of Transportation (FDOT) and other transportation agencies in th ...
  • Evaluation of Highway Safety Improvement Projects and Countermeasures Technical Report
    Evaluation of Highway Safety Improvement Projects and Countermeasures: Technical Report
    Tsapakis, Ioannis ;
    Sharma, Sushant
    2019-10-01 | PDF
    The Highway Safety Improvement Program (HSIP) is a core Federal-aid, state-administered program in which each state is required to develop and establish planning, implementation, and evaluation processes. The goal of evaluation activities is to determine if highway safety improvements are achieving the desired results and the investments are worthw ...
  • Statewide Implementation of Innovative Safety Analysis Tools in Identifying Highway Safety Improvement Projects Technical Report
    Statewide Implementation of Innovative Safety Analysis Tools in Identifying Highway Safety Improvement Projects: Technical Report
    Tsapakis, Ioannis ;
    Holik, William
    2019-10-01 | PDF
    The Highway Safety Improvement Program (HSIP) aims to achieve a reduction in the number and severity of fatalities and serious injury crashes on all public roads by implementing highway safety improvement projects. Transportation agencies continuously try to find ways to improve their HSIP. Over the last few years, particular emphasis has been plac ...
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