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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 34121 - 34140 of 35412 results
  • 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 ...
  • Environmental Factors Relevant to Pavement Cracking in West Texas
    Environmental Factors Relevant to Pavement Cracking in West Texas
    Carpenter, Samuel H. ;
    Lytton, Robert L.
    1974-01-01 | PDF
    Environmental variables important in pavement cracking studies are catalogued for west Texas. This portion of the state is shown to receive the most severe environmental changes. Results from other studies, mainly in Canada, are interpreted in terms of the information gathered for west Texas. These data indicate that pavement deterioration in west ...
  • Procedures Manual for Roadside Hazard Inventory and Safety Improvement Alternatives
    Procedures Manual for Roadside Hazard Inventory and Safety Improvement Alternatives
    Weaver, Graeme D. ;
    Post, Edward R.
    1974-01-01 | PDF
    The cost-effectiveness analysis procedure for roadside safety improvement evaluation has been developed on an immediate implementation basis. This report documents the procedures to be applied in conducting the physical roadside hazard inventory and recommending safety improvement alternatives on Texas freeways. Immediate implementation of the mate ...
  • Tensile and Elastic Characteristics of Pavement Materials
    Tensile and Elastic Characteristics of Pavement Materials
    Marshall, Bryant P. ;
    Kennedy, Thomas W.
    1974-01-01 | PDF
    This report describes the results of an investigation of the tensile and elastic properties of highway pavement materials. Cores of four types of materials obtained from recently constructed highway pavements were obtained and tested. Experimental estimates of the tensile and elastic properties (tensile strength, modulus of elasticity, and Poissont ...
  • Development of a Model for Predicting Travel Time on an Urban Freeway
    Development of a Model for Predicting Travel Time on an Urban Freeway
    Messer, Carroll J. ;
    Dudek, Conrad L.
    1974-01-01 | PDF
    This report presents the development of a model for predicting the travel time required by a motorist to travel from any freeway location to the end of the freeway system during freeway incident conditions. Operating speeds and shock wave speeds can also be predicted. Typical incident solutions and travel time results are presented. The mathematica ...
  • Physiological biochemical and psychological responses in air traffic control personnel comparison of the 5day and 221 shift rotation patterns
    Physiological, biochemical, and psychological responses in air traffic control personnel : comparison of the 5-day and 2-2-1 shift rotation patterns.
    Melton, C.E. ;
    McKenzie, J.M.
    1973-12-01 | PDF
    Stress in controllers on the straight five-day shift was determined at Houston Intercontinental Tower in 1970. In 1971 controllers on the 2-2-1 rotation were studied at the same tower. Controllers generally prefer the 2-2-1 to the straight five-day schedule because of the long week end associated with the 2-2-1. Management is concerned that the 'qu ...
  • Effects of secobarbital and damphetamine on tracking performance during angular acceleration
    Effects of secobarbital and d-amphetamine on tracking performance during angular acceleration.
    Schroeder, David J. ;
    Collins, William E.
    1973-12-01 | PDF
    Thirty young men were randomly assigned in equal numbers to one of the following groups: placebo (lactose), secobarbital (100 mg), or d-amphetamine (10 mg). The drugs or placebo were administered in capsules in a double-blind procedure. Tests were scheduled 1, 2, and 4 hours after capsule ingestion; all tests were conducted inside a Stille-Werner r ...
  • 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 ...
  • Utility of several clinical tests of color defective vision in predicting daytime and nighttime performance with the aviation signal light gun
    Utility of several clinical tests of color defective vision in predicting daytime and nighttime performance with the aviation signal light gun.
    Steen, Jo Ann ;
    Collins, William E.
    1973-12-01 | PDF
    Subjects of varying type and degree of color deficiency were tested on a battery of color tests, including the American Optical Company Plates (both 1940 and 1965 editions), the Dvorine Plates, the Farnsworth-Munsell 100-hue, the Farnsworth Lantern, the Farnsworth Panel D-15, the SAM Color Threshold Tester, the Titmus Vision Tester Color Plate, and ...
  • 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 ...
  • 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 ...
  • Susceptibility to anxiety and shift difficulty as determinants of state anxiety in air traffic controllers
    Susceptibility to anxiety and shift difficulty as determinants of state anxiety in air traffic controllers.
    Smith, Roger C. ;
    Melton, C.E.
    1973-12-01 | PDF
    The State-Trait Anxiety Inventory (STAI) was used to assess the anxiety of air traffic controllers who had experienced difficult and easy work shifts. Eighty volunteers completed the STAI before and after two or more eight-hour work shifts. Controllers relatively high in anxiety proneness tended to report higher levels of anxiety in association wit ...
  • Earprotector ratings
    Ear-protector ratings.
    Tobias, Jerry V. ;
    Irons, F. Michael
    1973-12-01 | PDF
    Twenty-one brands of ear protectors, including custom-molded, wearer-molded, and pre-molded types, were evaluated according to American-standard procedures. Earplugs are described and are listed in the order of their low-frequency (below 1000 Hz) attenuation.
  • 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 ...
  • 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 ...
  • Project FARE Task IV Report Urban Mass Transportation Industry Financial and Operating Data Reporting System Volume I Task and Project Summary
    Project FARE Task IV Report: Urban Mass Transportation Industry Financial and Operating Data Reporting System. Volume I. Task and Project Summary
    Harvey, David L. ;
    Nagel, John W.
    1973-11-01 | PDF
    The report contains a description of the uniform reporting system for the urban mass transit industry designed and tested in Project FARE. It is presented in five volumes. Volume I contains a description of how Task IV was accomplished and the conclusions and recommendations reached at the end of the task. It also contains a summary of the conduct ...
  • Evaluation of sand fills
    Evaluation of sand fills.
    Kinchen, Richard W. ;
    Melancon, J. L.
    1973-11-01 | PDF
    A popular construction technique in south Louisiana for many years has been the use of river sand to establish foundations for highways. The abundance of river sand and the need for it in excavation backfill operations across Louisiana's marshlands have fostered this concept.Recent construction problems on Route I-10 in St. James Parish and the dec ...
  • Soilcement study final report
    Soil-cement study : final report.
    Melancon J. L. ;
    Shah, S. C.
    1973-11-01 | PDF
    This study consisted of an examination of the compressive strengths of soil-cement mixtures on 15 construction projects from the standpoint of design and actual achievement. The laboratory design test was examined closely along with the present field method of density control for soil-cement bases and the distribution of cement within the bases.the ...
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