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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 34781 - 34800 of 35440 results
  • Binocular fusion time in sleepdeprived subjects
    Binocular fusion time in sleep-deprived subjects.
    Melton, C.E. ;
    Wicks, Marlene
    1969-01-01 | PDF
    The attainment of binocular single vision when the distance of gaze is changed is a component of total reaction time and may be critical in flight when the gaze is changed from the instrument panel to the outside or from the outside to the instrument panel. This report deals with the effect of fatigue induced by sleep deprivation on the binocular f ...
  • Medical factors in US general aviation accidents
    Medical factors in U.S. general aviation accidents.
    Siegel, P.V. ;
    Mohler, S.R.
    1969-01-01 | PDF
    About ninety percent of fatal U. S. general aviation accidents involve factors other than the aircraft or outside circumstances. This necessarily brings the flight surgeon into the mainstream of aviation safety activities. The paper describes some relatively recent accidents which illustrate the roles played by medical factors. Preventive programs ...
  • Impact injury to the pregnant female and fetus in lap belt restraint
    Impact injury to the pregnant female and fetus in lap belt restraint.
    Snyder, Richard G. ;
    Snow, Clyde C.
    1968-12-01 | PDF
    Although it has been well established that the lap (seat) belt offers considerable protection against injury or death in crash environments, there has long been controversy over the injury potential to the pregnant female. This question is of importance in consideration of restraint and seat protective environments for both aircraft and automotive ...
  • Stiffness of Asphalt Cements Evaluated by Compression
    Stiffness of Asphalt Cements Evaluated by Compression
    Traxler, R. N.
    1968-11-01 | PDF
    Objectives of the Study are to: (1) Investigate the asphalt cements used by the Texas Highway Department, (2) Establish specifications to assure the use of superior asphalts by the Department, and (3) Determine how the durability of asphalt cements in service can be improved. This report describes preliminary development of a procedure for evaluati ...
  • Statistical Quality Control Studies and Findings Relative to Highway Construction An Annotated Bibliography
    Statistical Quality Control Studies and Findings Relative to Highway Construction: An Annotated Bibliography
    Darroch, J. G.
    1968-11-01 | PDF
    This is the report for 1967-1968 of what was set up to be a continuing project on statistical quality control, but which has not been renewed for 1968-1969. Of the five study objectives, two Quality Control Research in the Highway Field, and Applications to Highway Construction, have been accomplished and are summarized in this report.
  • US Department of Transportation First Annual Awards Ceremony
    U.S. Department of Transportation First Annual Awards Ceremony
    United States. Department of Transportation
    1968-10-15 | PDF
    It is rare that a person can share in establishing a tradition. We here participate in such a landmark event-the first in an annual series of awards ceremonies. This is only the second anniversary of the signing of the Department of Transportation Act. Yet, in this short time, many have distinguished themselves by especially significant service. Th ...
  • Annual Report of the Maritime Administration 1968 MARAD 1968
    Annual Report of the Maritime Administration 1968 [MARAD 1968]
    United States. Maritime Administration
    1968-10-08 | Annual Reports of the Maritime Administration | PDF
    Report of the Maritime Administration covering activities of the fiscal year ended June 30, 1968.
  • A Study of Transit Mixed Concrete
    A Study of Transit Mixed Concrete
    Rushing, Hollis B.
    1968-10-01 | PDF
    This report describes a research project in which aspects of transit mixed concrete were studied. Phase I describes the work performed in evaluating the effects of extended retention of concrete in a transit mix truck for three hours. Four mixes were evaluated. These were (1) sand and gravel concrete with no admixtures, (2) sand and gravel concrete ...
  • Creep and Shrinkage Properties of Lightweight Concrete Used in the State of Iowa Phase I
    Creep and Shrinkage Properties of Lightweight Concrete Used in the State of Iowa: Phase I
    Meyers, B L ;
    Branson, D E
    1968-10-01 | PDF
    In February of 1968 a cooperative research project by the Iowa State Highway Commission (Project No. HR-136) and the University of Iowa, Iowa City, Iowa was initiated in order to determine experimentally the creep and shrinkage characteristics of lightweight-aggregate concrete used in the State of Iowa. This report is concerned with Phase 1 of the ...
  • Free Acid in Soil Materials Exposed by Excavation for Highways in East Texas
    Free Acid in Soil Materials Exposed by Excavation for Highways in East Texas
    Miller, Wesley L. ;
    Godfrey, C. L.
    1968-10-01 | PDF
    Recurring failure of three applications of mulch sod on roadsides of Interstate 20 near Tyler, Texas led to a closer examination of soil material on the face of the cut slopes. The exposed materials on the slopes had pH values ranging from 2.5 to 4.0. Material from the surface of the cut slope was more acid than underlying materials. A general posi ...
  • The Effect of Access on Highway Right of Way Costs and the Determination of Special Benefits
    The Effect of Access on Highway Right of Way Costs and the Determination of Special Benefits
    Franklin, William D. ;
    Evans, Lynn A.
    1968-10-01 | PDF
    The specific objectives were: (1) to study and compare sections of the highway system constructed with frontage roads to sections constructed without frontage roads in order to determine the relative costs of right of way for sections transversing similar areas, (2) to observe the zone of influence of special benefits as opposed to general benefits ...
  • An Empirical Equation for Predicting Pavement Deflections
    An Empirical Equation for Predicting Pavement Deflections
    Scrivner, F. H. ;
    Moore, William M.
    1968-10-01 | PDF
    This report is intended to document the empirical equation for predicting pavement deflections given in Section 3.2 of Research Report 32-11, "A Systems Approach to the Flexible Pavement Design Problem"(l)• The equation predicts deflections measured by the Dynaflect*, given certain design parameters for the pavement. The equation was derived in two ...
  • A Study of Interstate Highways Frontage Roads and Industry Location
    A Study of Interstate Highways, Frontage Roads and Industry Location
    Richards, Hoy A. ;
    Miller, James P.
    1968-10-01 | PDF
    This study is part of an overall research program designed to provide information to the Highway Department to assist them in their decision- making concerning new highways. The purpose of this particular study was to determine the influence that the Interstate Highway System of Texas has had on the location of industrial activity within geographic ...
  • A Systems Approach to the Flexible Pavement Design Problem
    A Systems Approach to the Flexible Pavement Design Problem
    Scrivner, F. H. ;
    Moore, W. M.
    1968-10-01 | PDF
    This report stems from research performed in Project 2-8-62-32, "Application of AASHO Road Test Results to Texas Conditions." Its purpose is to make available to the Texas Highway Department a recommended procedure for the design of flexible pavements. The procedure takes into account both physical and cost variables, and provides a means for makin ...
  • Pressuremeter correlation study
    Pressuremeter correlation study.
    Higgins, C. M.
    1968-10-01 | PDF
    The determination of in-situ strengths at construction sites has long been a problem that has caused considerable difficulty for Construction Engineers. A variety of tests have been developed over a period of time to attempt to obtain an estimate of these conditions. Among these tests are unconfined compression, triaxial, vane shear, and direct she ...
  • Skid resistance study
    Skid resistance study.
    Rushing, Hollis B.
    1968-10-01 | PDF
    This report describes the design and construction of a two-wheel trailer for measuring skid resistance of roadway surfaces. The trailer was designed to conform to ASTM E274-65T Tentative Method of Test for Skid Resistance of Pavement Using a Two-Wheel Trailer.The development of the various measuring systems and component parts are discussed in deta ...
  • Assessment of the brocasulzer phenomenon via inter and intramodality matching procedures studies of signallight brightness
    Assessment of the broca-sulzer phenomenon via inter- and intra-modality matching procedures : studies of signal-light brightness.
    Lewis, Mark F. ;
    Mertens, Henry W.
    1968-10-01 | PDF
    Signal lights are presented to an observer as flashes with finite duration; thus, the effect of flash duration on the apparent brightness of the signal is important. The relation of effective signal brightness to flash duration and luminance finds expression in the Broca-Sulzer phenomenon. This study was concerned with the effect of method of measu ...
  • Physiological studies on air tanker pilots flying forest fire retardant missions
    Physiological studies on air tanker pilots flying forest fire retardant missions.
    Melton, C.E. ;
    Wicks, Marlene
    1968-10-01 | PDF
    Pre-flight and post-flight studies were carried out on five air tanker pilots; in-flight studies were carried out on four of these five pilots. Pre- and post-flight studies consisted of a questionnaire and determinations of blood pressure, psychomotor performance and urine chemistry for stress metabolites. In-flight studies consisted of ECG, rectal ...
  • Adaptation to vestibular disorientation X Modification of vestibular nystagmus and vertigo by means of visual stimulation
    Adaptation to vestibular disorientation. X, Modification of vestibular nystagmus and "vertigo" by means of visual stimulation.
    Collins, William E.
    1968-10-01 | PDF
    A conflict among sensory signals frequently underlies problems of disorientation, vertigo, and motion sickness. In this study, visual information in conflict with vestibular signals was presented to groups of subjects by illuminating the test room for brief periods during angular deceleration, or immediately after termination of deceleration. Trial ...
  • Cockpit noise intensity eleven twinengine light aircraft
    Cockpit noise intensity : eleven twin-engine light aircraft.
    Tobias, Jerry V.
    1968-10-01 | PDF
    Eleven of the most popular twin-engine general-aviation light aircraft were tested for the noise intensity present during normal cruising operations at 2000, 6000, and 10000 feet MSL (mean sea level). Although generally quieter than single-engine planes, these aircraft, in comparison with currently accepted DRC (Damage-risk criterion) curves, have ...
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