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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 34321 - 34340 of 35412 results
  • Effects of alcohol on a problem solving task
    Effects of alcohol on a problem solving task.
    Chiles, W. Dean ;
    Jennings, Alan E.
    1972-03-01 | PDF
    Twenty subjects were tested on two separate days on a simple problem-solving task. Half of the subjects received alcohol on the first day of testing and half on the second day of testing. A control group of 11 subjects was also tested on two days and they were given a placebo on the first day of testing. All 31 subjects were also serving in a vesti ...
  • Evaluation of joint sealant materials interim report No 1
    Evaluation of joint sealant materials : interim report No. 1.
    Burt, W. T. ;
    Azar, David G.
    1972-03-01 | PDF
    This report illustrates some of the problems caused by ineffectively sealed joints and points to the great need for properly sealing joints in both concrete pavements and structures.The principles of design including slab lengths, joint dimensions and joint formation as well as the projected effects of debris, traffic and the environment have been ...
  • Development of Methods for Predicting Airloads on TACV Configurations Due to Strong Crosswind Gusts
    Development of Methods for Predicting Airloads on TACV Configurations Due to Strong Crosswind Gusts
    Ruetenik, J. Ray ;
    Zartarian, Garabed
    1972-03-01 | PDF
    Equations for predicting the transient side force and yawing moment on TACV cars due to a strong side gust are developed. The protection afforded by side rails is estimated. The equations account for transient slender-body effects and growth of vortices on the lee side. For a vehicle speed of 150 mph, the analysis indicates a side gust of 60 mph wo ...
  • Use of Additives to Retard Hardening of Asphalts by Actinic Solar Radiation
    Use of Additives to Retard Hardening of Asphalts by Actinic Solar Radiation
    Traxler, Ralph N.
    1972-03-01 | PDF
    In order to establish a base for the reader's understanding of the overall project, this abstract must, of necessity, mention research done prior to the current investigation. Hardening of asphalts used in the surface courses of bituminous pavements has been studied by Texas Transportation Institute during the past nine years. This subject is of ec ...
  • A Study of Variables Associated with Wheel SpinDown and Hydroplaning
    A Study of Variables Associated with Wheel Spin-Down and Hydroplaning
    Martinez, J. E. ;
    Lewis, J. M.
    1972-03-01 | PDF
    An evaluation of the wet weather properties of a portland cement concrete pavement and a bituminous surface treatment is presented. The study uses wheel spin-down as the criterion and considers the effect of water depth, tire inflation pressure, tire tread depth and wheel load. A hydroplaning trough 800 ft. long, 30 in. wide and 4 in. deep was used ...
  • Creep Recovery of Concrete Subjected to Multiaxial Compressive Stresses and Elevated Temperatures
    Creep Recovery of Concrete Subjected to Multiaxial Compressive Stresses and Elevated Temperatures
    Hijazi, Amin ;
    Kennedy, Thomas W.
    1972-03-01 | PDF
    This report presents the findings of an experimental investigation to evaluate the effects of three different factors on the instantaneous and creep recovery strain of plain concrete after being subjected to sustained loads for a period of one year. The factors investigated were (1) temperature during the loading and unloading periods (75° F and 15 ...
  • Effectiveness of restraint equipment in enclosed areas
    Effectiveness of restraint equipment in enclosed areas.
    Lowrey, D.L. ;
    Langston, E.D.
    1972-02-01 | PDF
    A series of 20-g decelerations of a crash sled was conducted to determine the magnitude of head impact decelerations while wearing various types of restraint equipment in small confined areas. Restraint webbing loads and head impact decelerations are presented for three directions of impact (straight forward, and 90 deg to left and right). Restrain ...
  • The benefits of the use of shoulder harness in general aviation aircraft
    The benefits of the use of shoulder harness in general aviation aircraft.
    Sirkis, Joseph A.
    1972-02-01 | PDF
    The installation and use of shoulder harnesses is a practical and relatively inexpensive solution to the problem of maintaining separation between man and machine during an aircraft crash sequence. The addition of shoulder harness to the tiedown chain of the general aviation aircraft occupant will increase the probability of the user surviving a se ...
  • Evaluation of a fiberglass instrument glare shield for protection against head injury
    Evaluation of a fiberglass instrument glare shield for protection against head injury.
    Langston, E.D. ;
    Swearingen, John J.
    1972-02-01 | PDF
    An all fiberglass prototype glare shield has been evaluated in terms of head injury protection. In 30-ft./sec. head impacts, a protrusion is designed to fold down over the heavy instruments, offering significant improvement in head injury protection when compared to current aircraft instrument panel design. Design changes to eliminate a fracture po ...
  • Pilot tracking performance during successive inflight simulated instrument approaches
    Pilot tracking performance during successive in-flight simulated instrument approaches.
    Rasmussen, Paul G. ;
    Hasbrook, A. Howard
    1972-02-01 | PDF
    Eight instrument rated pilots with flying experience ranging from 600 to 12,271 hours each flew 10 simulated ILS instrument approaches in a single engine, general aviation aircraft equipped with a primary flight display arranged in a conventional 'T' configuration. Continuous glide slope and localizer tracking performance was recorded during each a ...
  • Joint Atmospheric Modeling and Chemical Dynamics Workshop
    Joint Atmospheric Modeling and Chemical Dynamics Workshop
    Underwood, Robert L.
    1972 | PDF
    No Description
  • The point system for driver license administration a viable alternative for Virginia
    The point system for driver license administration : a viable alternative for Virginia?.
    Micas, Steven L
    1972-01-01 | PDF
    Traffic safety research was noted to have been unable to produce any empirical evidence that the introduction of a point system would affect, either negatively or positively, traffic accident statistics. In view of this absence of evidence, the similarity between Virginia's record-keeping procedures and one type of point system, and the admitted ad ...
  • Fog a review of the literature pertaining to highway problems and possible solutions
    Fog : a review of the literature pertaining to highway problems and possible solutions.
    Creech, Marion F
    1972-01-01 | PDF
    1. Fogs are significant contributors to multiple car accidents that often result in fatalities. 2. Systems that adequately abate fogs or lighting systems that provide minimum visibility requirements have not evolved. 3. Most abatement techniques stem directly from methods used at airports. It is well to use methods already developed but the roadway ...
  • Primer on noise
    Primer on noise.
    Noble, David F
    1972-01-01 | PDF
    This primer was directed to the district and resident engineers of the Virginia Department of Highways, who are responsible for conducting highway public hearings, and to the environmental specialists of the Department's Environmental Quality Division, who are responsible for the Department's work in noise pollution. The purpose of the primer was t ...
  • Petromat installation report
    Petromat installation report.
    Hughes, Charles S
    1972-01-01 | PDF
    An unwoven polypropylene fabric, trade name "Petromat," was used to minimize reflection cracks. This report describes the installation of the material and its very early performance.
  • Control strip study interim report
    Control strip study : interim report.
    Shah, S. C. ;
    Melancon, J. L.
    1972-01-01 | PDF
    This report is concerned with the application of the "control strip" technique using nuclear devices for compaction control of certain base courses and asphaltic concrete surface course. The technique, as evaluated here, consisted of applying increasing compactive effort to a small section (300 feet) of the material type to establish the optimum ro ...
  • Collapsible soils in Louisiana
    Collapsible soils in Louisiana.
    Arman, Ara ;
    Thornton, Samuel I.
    1972-01-01 | PDF
    In southwest Louisiana, some surface silts (up to 3 feet deep) collapse under load after moisture is added. These soils were indistinguishable from nearby normal silts through routine tests. The deposits occur as low, gently-sloping ridges. Very similar collapsible soils were found in the well-known pimple mounds of the area. In the stable silts, v ...
  • The stripping of penetration 85100 asphalt from silicate aggregate rocks a laboratory study
    The stripping of penetration 85-100 asphalt from silicate aggregate rocks : a laboratory study.
    Walker, Hollis N
    1972-01-01 | PDF
    In Virginia stripping has occurred when certain of the acidic silicate rocks have been used as aggregate in bituminous paving. The purpose of this project was to discover which kinds of silicate aggregate would be most apt to remain well bonded in bituminous mixes and which would be more apt to have a poor bond and become stripped from their binder ...
  • A survey of waterproofing membrane systems for bridge decks
    A survey of waterproofing membrane systems for bridge decks.
    McKeel, Wallace T
    1972-01-01 | PDF
    This survey was concerned with only a few of the many waterproof systems available for sealing concrete bridge decks, and made use of personal contacts with engineers of other highway agencies. The information gathered indicated that there were several systems that warranted testing in Virginia. Evaluations of the effectiveness of the membrane syst ...
  • A comparison of blood alcohol levels as determined by breath and blood tests taken in actual field operations
    A comparison of blood alcohol levels as determined by breath and blood tests taken in actual field operations.
    Smith, Thomas J
    1972-01-01 | PDF
    During its 1972 session, the General Assembly of Virginia enacted Senate Bill 104, which authorizes the breath test, as well as the blood test used previously, as a proper chemical test to determine the alcoholic content of the blood. Any person arrested in Virginia after January 1, 1973 for suspicion of driving while intoxicated may elect to have ...
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