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Showing 35421 - 35440 of 36747 results
  • Verification of MICNOISE computer program for the prediction of highway noise
    Verification of MICNOISE computer program for the prediction of highway noise
    Haviland, J. K. ;
    Noble, David F.
    1974-01-01 | PDF
    The objectives of this study were to verify the computer program used by the Virginia Department of Highways to predict highway sound pressure levels, to determine whether the accuracy and usefulness of the program could be improved, and to make recommendations for future research. In the report, the recommendations of NCHRP Report 117 are describe ...
  • Characteristics and effectiveness of the driver improvement schools within the Fairfax ASAP 1973
    Characteristics and effectiveness of the driver improvement schools within the Fairfax ASAP, 1973.
    Lynn, Cheryl
    1974-01-01 | PDF
    Descriptive data concerning the objectives of the Driver Improvement Schools (DIS) are presented to emphasize the specialized nature of the subgroups within this modality. These subgroups include the Northern Virginia Community College Driver Improvement School (NVCC-DIS), the Fairfax County High School Driver Improvement School (FCHS-DIS), and the ...
  • Evaluation of experimental flexible pavements interim report no 1 construction of Altavista Bypass experimental pavement
    Evaluation of experimental flexible pavements : interim report no. 1, construction of Altavista Bypass experimental pavement.
    McGhee, Kenneth H
    1974-01-01 | PDF
    Deflection tests conducted during the construction and shortly after the completion of a large experimental pavement project are reported. Four different pavement designs, as follows, are compared: 1. 6-inch cement stabilized subgrade, 6-inch crushed stone base, 71/2-inch bituminous concrete. 2. 6-inch cement stabilized subgrade, 91/2-inch bitumino ...
  • A design program for the estimation and abatement of soil losses from highway slopes
    A design program for the estimation and abatement of soil losses from highway slopes.
    Poche´, David J
    1974-01-01 | PDF
    A manual was prepared for use in estimating soil losses and designing adequate abatement structures along the ditch lines of roadways. These tasks were to be accomplished by a computer program intended to be used on the IBM Model 370 computer. The manual was intended for use by personnel of the Location and Design Division and Environmental Quality ...
  • The effect of diagrammatic signing at head speed interchanges final report by Frank D Shepard
    The effect of diagrammatic signing at head speed interchanges; final report, by Frank D. Shepard.
    Shepard, Frank D.
    1974 | PDF
    Improvements in highway guide signing at interchange areas are needed to reduce driver confusion and the accidents that result from it. One possible means of improving traffic operations within interchange areas is through the use of diagrammatic signs that give a graphic representation of the highway or interchange ahead. This study consisted of a ...
  • A survey to determine the impact of changes in specifications and construction practices on the performance of concrete in bridge decks
    A survey to determine the impact of changes in specifications and construction practices on the performance of concrete in bridge decks.
    Newlon, Howard.
    1974-01-01 | PDF
    In response to its own research and observations in the early 1960's the Virginia Department of Highways mounted an intensive and extensive effort to improve the performance of concrete in bridge decks. Major elements of this effort included (1) a training and certification program for Department and industry personnel and (2) improved and upgraded ...
  • A look at the public involvement procedures in twelve state transportation agencies
    A look at the public involvement procedures in twelve state transportation agencies.
    Perfater, Michael A
    1974 | PDF
    Of the twenty-four Action Plans perused, several were very general in their approach to citizen participation while others were very specific. The twelve chosen for presentation here were the ones taking the most specific approaches. Although these twelve vary greatly with respect to their specificity, the states generally take two approaches to th ...
  • Design of OpenGraded Asphalt Friction Courses
    Design of Open-Graded Asphalt Friction Courses
    Spelman, S. R. ;
    Rice, J. M.
    1974-01-01 | PDF
    Efforts to improve pavement skid resistance have shown the advantages of using open-graded asphalt paving mixtures. Extensive implementation of these mixtures has been hampered, however, due to some difficulties encountered during construction and some deficiencies observed in service performance. These problems are partially attributable to a numb ...
  • Incorporating economic considerations in the preparation of environmental impact statements a suggested approach
    Incorporating economic considerations in the preparation of environmental impact statements : a suggested approach.
    Allen, Gary R
    1974-01-01 | PDF
    The purpose of the research was two-fold: (1) to provide persons in the Department who prepared impact statements a guide to the effects that highway improvements had on the economic activity of an area, and (2) to place in proper perspective the use of user and nonuser impacts as measures of the costs and benefits of highways.
  • Evaluation of skid test automatic digital recording system
    Evaluation of skid test automatic digital recording system.
    Huckstep, Frederick L.
    1974-01-01 | PDF
    The Virginia skid vehicle has been equipped with a digital data recording system to provide rapid reduction of skid measurement data. It was found that five to ten minutes are required to evaluate a single measurement using the original analog strip chart system, whereas the digital results for a full day of testing can be evaluated within a matter ...
  • Procedures For Continuing Metropolitan Planning Final Research Report
    Procedures For Continuing Metropolitan Planning: Final Research Report
    Boyce, David E. ;
    McDonald, Chris
    1974-01-01 | PDF
    This report marks the conclusion of the third phase of the Metropolitan Plan Evaluation Project. Findings of both phases two and three are summarized here. More detailed and technical results have been reported previously. The continuing metropolitan planning process consists of a complex of activities involving elected and appointed decision maker ...
  • Service Behavior of Asphalt Concrete a TenYear Study
    Service Behavior of Asphalt Concrete: a Ten-Year Study
    Beecroft, Gordon ;
    Jenkins, J. C.
    1974-01-01 | PDF
    The 10-year study of asphalt pavement behavior described herein was initiated to follow the changes that occur with time and traffic and to supplement existing information on material properties that contribute to more durable pavements. Measurement of surface characteristics and sampling of asphalt concrete and stone base were conducted twice year ...
  • Statistical Summaries of Iowa Streamflow Data Through September 30 1971
    Statistical Summaries of Iowa Streamflow Data Through September 30, 1971
    United States. Geological Survey (USGS)
    1974-01-01 | PDF
    The U.S. Geological Survey and organizations of the State of Iowa have had cooperative agreements for the systematic collection of streamflow data since 1914.The data have been published in the form of daily means discharges in the annual Water-Supply Papers and state Water Resources Data reports. More detailed information on Water-Supply Papers or ...
  • Aviation medicine translations annotated bibliography of recently translated material VIII
    Aviation medicine translations : annotated bibliography of recently translated material, VIII.
    Constant, Gregory N. ;
    Goulden, D.R.
    1973-12-01 | PDF
    An annotated bibliography of translations of foreign-language articles is presented. The 20 listed entries are concerned with studies of cardiology; aviation vestibular testing and vestibular factors in accidents; use of bones of identification of remains; psychological characteristics associated with pilots, stewardesses, and nuclear workers; stre ...
  • Study of control force limits for female pilots
    Study of control force limits for female pilots.
    Leeper, Robert C. ;
    Hasbrook, A. Howard
    1973-12-01 | PDF
    The study described in this paper was the second phase in a ground- based control force testing program conducted by the University of Oklahoma and the Civil Aeromedical Institute of the Federal Aviation Administration located in Oklahoma City, Oklahoma.A Convair-340 simulator, modified to conform to a typical civil aviation aircraft, was used for ...
  • Reception of distorted speech
    Reception of distorted speech.
    Tobias, Jerry V. ;
    Irons, F. Michael
    1973-12-01 | PDF
    Noise, either in the form of masking or in the form of distortion products, interferes with speech intelligibility. When the signal-to-noise ratio is bad enough, articulation can drop to unacceptably--even dangerously--low levels. However, listeners are capable of learning to listen to such speech and to improve their comprehension of it. In the ex ...
  • A comparison of the startle effects resulting from exposure to two levels of simulated sonic booms
    A comparison of the startle effects resulting from exposure to two levels of simulated sonic booms.
    Thackray, Richard I. ;
    Touchstone, Robert M.
    1973-12-01 | PDF
    Subjects were exposed indoors to simulated sonic booms having outside overpressures of 50 and 150 N/sq m. Rise times were held constant at 5.5 msecs. In addition to the outside measurements, inside measures of dBlin and dBA were also obtained. Subjects attempted to hold a hand-steadiness device on target during boom exposure and amplitude of the ar ...
  • Physiological responses in air traffic control personnel Houston Intercontinental Tower
    Physiological responses in air traffic control personnel : Houston Intercontinental Tower.
    Melton, C.E. ;
    McKenzie, J.M.
    1973-12-01 | PDF
    Biochemical and physiological indices of stress showed that the level of stress of 16 air traffic controllers at the Houston Intercontinental Airport Tower was indistinguishable from that of control populations. While the level of stress was lower than that among O'Hare Tower controllers, both groups showed about the same degree of adaptation.Day w ...
  • Personality and physiological correlates of performance decrement on a monotonous task requiring sustained attention
    Personality and physiological correlates of performance decrement on a monotonous task requiring sustained attention.
    Thackray, Richard I. ;
    Jones, Karen N.
    1973-12-01 | PDF
    The reductions in task load resulting from the increasing automation of air traffic control may actually increase the requirement for controllers to maintain high levels of sustained attention in order to detect infrequent system malfunctions. A previous study indicated that individuals scoring high on a distractibility scale found it difficult to ...
  • Flying high the aeromedical aspects of marihuana
    Flying high : the aeromedical aspects of marihuana.
    Lewis, Mark F. ;
    Ferraro, Douglas P.
    1973-12-01 | PDF
    A summary of the discussions from the Civil Aeromedical Institute Symposium on aeromedical aspects of marihuana is presented. The invited panel discussed the legal aspects of marihuana use and aviation, the experiences of military aviation, and the acute and chronic effects of the drug. For civil aviation, the panel proposed a 12-16 hour period bet ...
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