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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 8081 - 8100 of 36151 results
  • Managing Pedestrian and Car Interactions
    Managing Pedestrian and Car Interactions
    Daganzo, Carlos F. ;
    Anderson, Paul R.
    2017-05-26 | PDF
    In urban areas and especially in inner cities, pedestrians crossing the road considerably influence the road traffic flow. For political (environmental) reasons, priority could be given to pedestrians. A larger number of crossings reduces the pedestrian load per crossing and facilitates both the pedestrian flow and the car flow; the ultimate case i ...
  • Conference Proceedings of the Northeast Autonomous Vehicle Summit
    Conference Proceedings of the Northeast Autonomous Vehicle Summit
    Simler, Tara ;
    Jackson, Eric
    2017-05-24 | PDF
    The development of autonomous vehicle technology and potential adoption of autonomous vehicles is occurring at a rapid rate in the United States. As this technology evolves, there are many technical, logistical and legal issues that need to be addressed concerning the surface transportation system and policies. It is projected within the next five ...
  • Modeling the Impact of OneWay Car Sharing An Integrated Data and OptimizationDriven Approach
    Modeling the Impact of One-Way Car Sharing: An Integrated Data- and Optimization-Driven Approach
    Frazzoli, Emilio
    2017-05-24 | PDF
    This work considers an approach to uncover ride-pooling opportunities in a shared-vehicle, mobility-on-demand system. In this setup, a fleet of self-driving vehicles, each capable of serving up to two passenger requests at a time, is used to trans-port passengers. In line with existing work, a station based model is used to represent the movement o ...
  • Conference proceedings of the Northeast Autonomous Vehicle Summit
    Conference proceedings of the Northeast Autonomous Vehicle Summit.
    Simler, Tara ;
    Mahoney, James
    2017-05-24 | PDF
    The development of autonomous vehicle technology and potential adoption of autonomous vehicles is occurring at a rapid rate in the United States. As this technology evolves, there are many technical, logistical and legal issues that need to be addressed concerning the surface transportation system and policies. It is projected within the next five ...
  • Intercity Bus Stop Analysis
    Intercity Bus Stop Analysis
    Clouser, Karalyn ;
    Kack, David
    2017-05-23 | PDF
    Intercity bus service (ICB) provides valuable public transportation services, primarily to people traveling long distances or those living in rural communities. The Federal Transportation Administration (FTA) defines intercity bus service as, “regularly scheduled bus service for the general public that operates with limited stops over fixed routes ...
  • A Study of the Traffic Safety at Reduced Conflict Intersections In Minnesota
    A Study of the Traffic Safety at Reduced Conflict Intersections In Minnesota
    Leuer, Derek ;
    Fleming, Katie
    2017-05-23 | PDF
    In 2010, the Minnesota Department of Transportation installed the first Reduced Conflict Intersection (RCI) in the City of Willmar. Since 2010, seven more were constructed, with more planned. The RCI concept is gaining popularity in several states, including Maryland, Mississippi, Missouri, North Carolina, and Wisconsin. This report includes findin ...
  • Intelligent Transportation Systems Joint Program Office ITS JPO within the Office of the Assistant Secretary for Research and Technology OSTR fact sheet
    Intelligent Transportation Systems Joint Program Office (ITS JPO) within the Office of the Assistant Secretary for Research and Technology (OST-R) : [fact sheet]
    United States. Department of Transportation. Intelligent Transportation Systems Joint Program Office
    2017-05-19 | PDF
    The ITS JPO is the U.S. Department of Transportation’s primary advocate and national leader for ITS research, development, and future deployment of connected vehicle technologies, focusing on intelligent vehicles, intelligent infrastructure, and the creation of an intelligent transportation system. The ITS JPO leads the strategic advancement of ITS ...
  • Small UAS Detect and Avoid Requirements Necessary for Limited Beyond Visual Line of Sight BVLOS Operations
    Small UAS Detect and Avoid Requirements Necessary for Limited Beyond Visual Line of Sight (BVLOS) Operations
    Askelson, Mark ;
    Cathey, Henry
    2017-05-19 | PDF
    Potential sUAS BVLOS operational scenarios/use cases and DAA approaches were collected through a number of industry wide data calls. Every 333 Exemption holder was solicited for this same information. Summary information from more than 5,000 exemption holders is documented, and the information received had varied level of detail but has given relev ...
  • A Unified Framework for Analyzing and Designing for Stationary Arterial Networks
    A Unified Framework for Analyzing and Designing for Stationary Arterial Networks
    Jin, Wenlong ;
    Shen, Shizhe
    2017-05-17 | PDF
    This research aims to develop a unified theoretical and simulation framework for analyzing and designing signals for stationary arterial networks. Existing traffic flow models used in design and analysis of signal control strategies are either too simple to be realistic or too detailed to be efficient. In this research we apply the link transmissio ...
  • Nonlinear Time History Analysis of Ordinary Standard Bridges
    Nonlinear Time History Analysis of Ordinary Standard Bridges
    Mackie, Kevin R. ;
    Scott, Michael H.
    2017-05-16 | PDF
    Reliable seismic response models are necessary to support the assessment and design of California highway bridges. To this end, similar results for nonlinear static and dynamic time history response should be obtained between disparate software packages. This requires transparency of the element and constitutive model formulations implemented in th ...
  • Prediction of Thermal Behavior of Pervious Concrete Pavements in Winter
    Prediction of Thermal Behavior of Pervious Concrete Pavements in Winter
    Chen, Zhao ;
    Nantasai, Benjamin
    2017-05-15 | PDF
    Because application of pervious concrete pavement (PCPs) has extended to cold-climate regions of the United States, the safety and mobility of PCP installations during the winter season need to be maintained. Timely application of salt, anti-icing, and deicing agents for ice/snow control is most effective in providing sufficient surface friction wh ...
  • Update State Study No 170 Deliverables with New PCC Test Data Revised final report for SS No 170 AASHTO 2002 Pavement Design GuidePhase II Volume 1
    Update State Study No. 170 Deliverables with New PCC Test Data Revised final report for SS No. 170, “AASHTO 2002 Pavement Design Guide-Phase II” – Volume 1
    Von Quintus, Harold L. ;
    Rao, Chetana
    2017-05-15 | PDF
    The objective of this research study was to develop performance characteristics of flexible and rigid pavements in Mississippi and to use these characteristics in the implementation of the Mechanistic-Empirical Pavement Design procedure that was developed under NCHRP Project 1-37A. Reliable transfer function and models will enable Mississippi Depar ...
  • Preventive Maintenance and Timing of Applications
    Preventive Maintenance and Timing of Applications
    Smith, Kelly ;
    Peshkin, David
    2017-05-12 | PDF
    The purpose of this project is to understand pavement maintenance techniques and the inter-relationship with the timing of their application. In order to meet this, the following objectives have been established: (1) Identify the components of a Pavement Preventive Maintenance (PPM) program. (2) Evaluate the state-of-the-practice relative to agenci ...
  • SDDOTS enhanced pavement management system visual distress survey manual 2017
    SDDOT'S enhanced pavement management system : visual distress survey manual [2017]
    South Dakota. Dept. of Transportation
    2017-05-11 | PDF
    In 1993, the South Dakota Department of Transportation initiated the Research Project SD93-14, Enhancement of South Dakota’s Pavement Management System. As the Research Project progressed, it was determined that to better evaluate the condition of the pavement, a more detailed distress survey needed to be performed by SDDOT. The Research Technical ...
  • MASH TEST NO 310 OF A NONPROPRIETARY HIGHTENSION CABLE MEDIAN BARRIER FOR USE IN 6H1V VDITCH TEST NO MWP8
    MASH TEST NO. 3-10 OF A NON-PROPRIETARY, HIGH-TENSION CABLE MEDIAN BARRIER FOR USE IN 6H:1V V-DITCH (TEST NO. MWP-8)
    Meyer, Dylan T. ;
    Lechtenberg, Karla A.
    2017-05-10 | PDF
    The Midwest States Pooled Fund Program has been developing a prototype design for a non-proprietary, hightension cable median barrier for use in a 6H:1V V-ditch. This system incorporates four evenly spaced cables, Midwest Weak Posts (MWP) spaced at 8 to 16 ft (2.4-4.9 m) intervals, and a bolted, tabbed bracket to attach three or four cables to the ...
  • Analysis of crash characteristics on freeways with depressed medians in Southcentral Alaska
    Analysis of crash characteristics on freeways with depressed medians in Southcentral Alaska.
    Bham, Ghulam H. ;
    Hafele, Brendan
    2017-05-09 | PDF
    The characteristics of crashes on depressed medians of four freeways in Southcentral Alaska were examined under winter conditions. Cross-median crashes (CMC) were dispersed randomly along the freeways analyzed. CMC were 2.5 times likely to cause a severe injury crash compared to an in-median crash. Rollovers were 72.9%, a very high percentage, amon ...
  • Bridge Girder Details for Improved Performance
    Bridge Girder Details for Improved Performance
    Wehbe, Nadim ;
    Konrad, Michael
    2017-05-08 | PDF
    Precast/prestressed double tee bridge girders are widely used for accelerated bridge construction on local roads in South Dakota. A common issue among existing double tee bridges in South Dakota is the rapid deterioration of longitudinal joints (shear keyways) between adjacent girders. Deteriorated joints allow moisture and deicing chemicals to rea ...
  • Developing Michigan Pedestrian and Bicycle Safety Models
    Developing Michigan Pedestrian and Bicycle Safety Models
    Hampshire, Robert C ;
    Molnar, Lisa J.
    2017-05-07 | PDF
    Reducing the number of pedestrian and bicycle-involved crashes, injuries, and fatalities is a priority nationwide, including Michigan. It is important to identify those locations and attributes associated with locations that are most prone to such crashes. Relying on observed crashes or hotspot analysis can be misleading due to statistically anomal ...
  • Advanced Statewide Calibration of MEPDG for NMDOT
    Advanced Statewide Calibration of MEPDG for NMDOT
    Tarefder, Rafiqul A. ;
    Hasan, Md Mehedi
    2017-05-06 | PDF
    The recently developed Mechanistic Empirical Pavement Design Guide (MEPDG), which is an improved and advanced methodology for the design of pavement structures, has enhanced the necessity to precisely characterize the pavement materials. A competent structural design of a pavement using MEPDG Level 1 analysis requires materials input parameters to ...
  • Characterization of Unknown Bridge Foundations
    Characterization of Unknown Bridge Foundations
    Ng, Tang-Tat ;
    Maji, Arup
    2017-05-06 | PDF
    The Federal Highway Administration has reported 85,000 bridges nationwide that have no design or as-built plans identifying the type, depth, geometry, and materials of the foundations. It is evident that an unknown percentage of these bridges with missing foundation data could also be highly vulnerable to scouring that is induced by water flow coup ...
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