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Showing 27461 - 27480 of 35628 results
  • Release Methodology of Prestressing Strands
    Release Methodology of Prestressing Strands
    Kannel, Jeffrey J. ;
    French, Catherine E. W.
    1998-05-01 | PDF
    This report presents the results of numerical and experimental investigations to determine the causes of prestressed concrete girder end cracks. The cracks, which develop during the flame-cutting release process, result from the restraining effect of unreleased strands as the girder shortens from the partially transferred prestress and from shear s ...
  • A Human Factors Perspective on Human External Loads
    A Human Factors Perspective on Human External Loads
    Shehab, R.L. ;
    Schlegel, Robert E.
    1998-05-01 | PDF
    Title 14 part 133 of the Federal Code of Regulations (14 CFR 133) titled, "Rotorcraft External Load Operations," describes the operation and certification rules governing helicopter external load operations. Specifically, part 133.45 addresses rotorcraft operations involving human external loads (HELs) and the design of personnel lifting devices us ...
  • Investigation of Development of Pavement Roughness
    Investigation of Development of Pavement Roughness
    Perera, R. W. ;
    Byrum, C.
    1998-05-01 | PDF
    The Long-Term Pavement Performance (LTPP) program was designed as a 20-year study of pavement performance. The LTPP program consists of two programs: (1) General Pavement Studies (GPS) that use in-service test sections in either their original design phase or in their first overlay phase and (2) Specific Pavement Studies (SPS) that investigate the ...
  • Review of Current Geographic Information Systems Technology for TxDOT Pavement Management Information System
    Review of Current Geographic Information Systems Technology for TxDOT Pavement Management Information System
    Zhang, Zhanmin ;
    McNerney, Michael T.
    1998-05-01 | PDF
    A geographic information system (GIS) is a tool for effectively managing and analyzing tremendous amounts of geographic information. It employs the essential principle of geography to organize in formation and express relationships between real-world phenomena. In recent years, GIS has become increasingly important in supporting decisions made in a ...
  • Aircraft Importance and Its Relevance to Situation Awareness
    Aircraft Importance and Its Relevance to Situation Awareness
    Gronlund, S. D. ;
    Ohrt, Daryl D.
    1998-05-01 | PDF
    We tested en route air traffic controllers (currently serving as instructors at the FAA Academy) to determine what they remember about the aircraft in their sector. We focused on memory for flight data (especially aircraft altitude and ground speed) and the position of the aircraft on the radar screen. Aircraft importance affected memory for flight ...
  • Investigation of ownership and maintenance responsibilities for structures separating highway and railroad traffic
    Investigation of ownership and maintenance responsibilities for structures separating highway and railroad traffic.
    Birch, S. C.
    1998-05-01 | PDF
    One of the goals defined in Virginia Connections: Strategic Plan for Transportation is to "reduce or eliminate obsolete state laws governing transportation providers." In response to this goal, then Secretary of Transportation Robert Martinez established a Rail Issues Legislative Task Force and charged them with reviewing the laws and regulations g ...
  • System of activitybased models for Portland Oregon
    System of activity-based models for Portland, Oregon
    Bowman, John
    1998-05-01 | PDF
    This report demonstrates that activity-based travel demand models are currently feasible and can replace traditional trip-based travel four-step demand models for urban areas. Travel decisions are part of a broader activity scheduling decision, and requires that we model the demand for activities as well as mobility. The objective of the research w ...
  • Advanced planning surveys using automatic license plate reading equipment and evaluation of automatic license plate reading equipment for advanced planning
    Advanced planning surveys using automatic license plate reading equipment and evaluation of automatic license plate reading equipment for advanced planning
    French, L. J. ;
    Martinelli, D. R.
    1998-05-01 | PDF
    Recent technological advances in computer hardware, software, and image processing have led to the development of automated license plate reading equipment. This equipment has primarily been developed for enforcement and security applications, such as monitoring parking garages or border crossings. Because license plate data are used in several tra ...
  • LTPP traffic data collection and monitoring
    LTPP traffic data collection and monitoring
    Kombe, E. M.
    1998-05-01 | PDF
    Traffic data collection is a vital part of the Strategic Highway Research Program's (SHRP) Long Term Pavement Performance Project (LTPP), of which the Arizona Department of Transportation is an active participant. The accurate monitoring and evaluation of traffic data, particularly along test sections (Specific Pavement Studies and General Pavement ...
  • Mechanisticempirical evaluation of the MnROAD low volume road test sections
    Mechanistic-empirical evaluation of the Mn/ROAD low volume road test sections.
    Garg, Navneet ;
    Thompson, Marshall
    1998-05-01 | PDF
    The purpose of this study was to use Mn/ROAD mainline flexible pavement data to verify, refine, and modify the Illinois Department of Transportation (IDOT) Mechanistic-Empirical (M-E) based flexible pavement design procedures and concepts.
  • Electronic toll collection interoperability study in Brazil Task 2 economic and financial analysis and Task 3 environmentalsocietal analysis
    Electronic toll collection interoperability study in Brazil. Task 2 : economic and financial analysis and Task 3 : environmental/societal analysis
    Parsons, Brinckerhoff, Quade & Douglas
    1998-05-01 | PDF
    This report, conducted by Parsons Bricknerhoff International, was funded by the U.S. Trade and Development Agency. The report examines the potential for developing electronic toll collection systems in Brazil. This is Volume II and it contains "Task 2. Economic and Financial Analysis. and Task 3. Environmental/Societal Analysis"
  • Electronic toll collection interoperability study in Brazil Task 4 recommendations and final report
    Electronic toll collection interoperability study in Brazil. Task 4 : recommendations and final report
    Parsons, Brinckerhoff, Quade & Douglas
    1998-05-01 | PDF
    The report examines the potential for developing electronic toll collection systems in Brazil. This is Volume III and it is 'Task-Recommendations and Final Report'. The report is made up of the following subtasks: (1) Issue Recommended Installation Standards
  • Electronic toll collection interoperability study in Brazil Task 1 data collection
    Electronic toll collection interoperability study in Brazil. Task 1 : data collection
    Parsons, Brinckerhoff, Quade & Douglas
    1998-05-01 | PDF
    The report, conducted by Parsons Bricknerhoff International, was funded by the U.S. Trade and Development Agency. The report examines the potential for developing electronic toll collection systems in Brazil. This is volume I and it is Task 1, the data collection.
  • Shear capacity of highstrength concrete prestressed girders
    Shear capacity of high-strength concrete pre-stressed girders.
    Cumming, D. A. ;
    French, C. E.
    1998-05-01 | PDF
    As part of a project at the University of Minnesota to investigate the application of high-strength concrete in prestressed girders, four shear tests were performed on high-strength concrete prestressed girders.
  • Resilient modulus and fatigue life characterization of asphalt concrete mixtures used in the Ohio Test Road special student study
    Resilient modulus and fatigue life characterization of asphalt concrete mixtures used in the Ohio Test Road : special student study
    Figueroa, J. L. ;
    DeButy, P. W.
    1998-05-01 | PDF
    The performance of flexible and rigid pavements depends not only on the effects of traffic but also on environmental effects. As part of the Federal Highway Administration's (FHWA) Strategic Highway Research Program (SHRP), a test road was recently constructed on U.S. 23 just North of Delaware, Ohio. This road includes four different sets of sectio ...
  • Welfare reform transportations role in moving from welfare to work
    Welfare reform : transportation's role in moving from welfare to work
    United States. General Accounting Office
    1998-05-01 | PDF
    Transportation and welfare studies show that without adequatetransportation, welfare recipients face significant barriers in trying to move from welfare to work. These challenges are particularly acute for urban mothers receiving welfare who do not own cars and must makemultiple trips each day to accommodate child care and other domesticresponsibil ...
  • Fatigue performance of variable message sign luminaire support structures volume II fatigue related wind loads on highway support structures
    Fatigue performance of variable message sign & luminaire support structures : volume II, fatigue related wind loads on highway support structures.
    Consolazio, Gary R. ;
    Johns, Kevin W.
    1998-05-01 | PDF
    In Order to determine equivalent static pressures for fatigue loads on cantilevered highway support structures acantilevered Variable Message Sign(VMS) located along Interstate westbound at mile marker 48.5 in northernNew Jersey was continuously monitored for three months. The structure was instrumented with strain gages,pressure transducers, and a ...
  • Development of Working Day Weather Charts for Transportation Construction in South Dakota
    Development of Working Day Weather Charts for Transportation Construction in South Dakota
    Kenner, Scott ;
    Johnson, Ron L.
    1998-05-01 | PDF
    Seasonal and daily weather events impact grading, surfacing and structure construction projects in various ways across the different climate regions of the state. When weather conditions prevent timely completion of major sequential components of a construction project, it often requires additional construction time leading to delays and subsequent ...
  • Measurement and Specification of Construction Quality Volume 1
    Measurement and Specification of Construction Quality, Volume 1
    Hughes, C. S. ;
    Simpson, A. L.
    1998-05-01 | PDF
    This study consisted oftesting six projects: three hot-mix asphalt concrete (HMAC) and three portland cement concrete (PCC). The primary objectives were to: (1) determine how current quality control test results vary in construction projects and how this variability affects pavement performance, (2) assess the suitability of current methods of quan ...
  • Maritime Administration 1997 Annual Report MARAD 1997
    Maritime Administration 1997 Annual Report [MARAD 1997]
    United States. Department of Transportation. Maritime Administration
    1998-05-01 | Annual Reports of the Maritime Administration | PDF
    The annual report of the Maritime Administration (MARAD) for the fiscal year (FY) which ended on September 30, 1997, is submitted to Congress in accordance with Section 208 of the Merchant Marine Act of 1936, as amended.
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