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Showing 34781 - 34800 of 36747 results
  • Highway Safety Programs Effectiveness Model
    Highway Safety Programs Effectiveness Model
    Mucciardi, A. ;
    Orr, E.
    1977-09-01 | PDF
    The purpose of this project was to construct a model capable of functionally relating highway safety (DOT/NHTSA) program outputs to (intermediate) risk factors and then to accidents, injuries and fatalities. The model inputs and outputs were obtained from a conceptual Causal Network which displayed the factors believed to influence the occurrence o ...
  • The role of monamine oxidase inhibition in the acute toxicity of chlordimeform
    The role of monamine oxidase inhibition in the acute toxicity of chlordimeform.
    Smith, Paul W. ;
    Robinson, Casey P.
    1977-08-01 | PDF
    This paper presents data from experiments on male rats performed to determine whether drugs which interfere with central amine mechanisms would decrease the lethality of the acaricide chlordimeform (and thus be of potential value as antidotes for accidental poisoning) or increase chlordimeform lethality (and thus should be avoided by aerial applica ...
  • Job attitudes of airway facilities personnel
    Job attitudes of airway facilities personnel.
    Smith, Roger C. ;
    Hutto, Gary L.
    1977-08-01 | PDF
    A total of 2,366 employees of the Airway Facilities (AF) Service responded to a detailed questionnaire concerning job satisfaction and such factors as salary, shift schedule, workload, and geographic location.In general, AF employees reported satisfaction with employment by the AF Service, particularly in the areas judged most important by them: sa ...
  • Texturing of concrete pavements interim report No 3
    Texturing of concrete pavements : interim report No. 3.
    Ross, Joseph E. ;
    Law, Sheldon M.
    1977-08-01 | PDF
    The scope of this report is to describe the results obtained at the end of thirty-six months for the third twelve-month period of this field research project. It includes the construction of test sections and the evaluation period after the project was opened to traffic. Each test section was evaluated using the following techniques:A. Visual Obser ...
  • A Report on the Users Manual for Diamond Interchange SignalizationPASSER III
    A Report on the User’s Manual for Diamond Interchange Signalization-PASSER III
    Fambro, Daniel B. ;
    Putman, Donald L.
    1977-08-01 | PDF
    This report describes the user's manual for PASSER III, a practical computer program developed to assist the traffic engineer in determining optimal traffic signal timings for pretimed or traffic-responsive, fixed sequence signalized diamond interchanges. The program is applicable to isolated interchanges as well as to a series of interchanges thro ...
  • Correlation of the Texas Cone Penetrometer Test NValue with Soil Shear Strength
    Correlation of the Texas Cone Penetrometer Test N-Value with Soil Shear Strength
    Duderstadt, Franklin J. ;
    Coyle, Harry M.
    1977-08-01 | PDF
    Improved correlations have been developed between the Texas Cone Penetrometer Test N-value and the shear strength of both cohesive and cohesionless soils. Correlations were also developed and compared with existing correlations for several shear strength parameters and the Standard Penetration Test N-value. Both field and laboratory investigations ...
  • Sampling and testing for chloride ion in concrete
    Sampling and testing for chloride ion in concrete
    Clear, Kenneth C. ;
    Harrigan, Edward T.
    1977-08-01 | PDF
    One of the most severe problems facing the highway community is chloride ion-induced reinforcing steel corrosion and the subsequent deterioration of concrete bridge decks and marine structures. This report presents recommended methods for sampling and testing for both total and water-soluble chloride ion in hardened concrete. The methods are update ...
  • New Materials Promote Safety Belt Usage
    New Materials Promote Safety Belt Usage
    United States. Department of Transportation. National Highway Traffic Safety Administration
    1977-07-20 | PDF
    A new series of pamphlets on safety belts for use by educators was announced today by the Department of Transportation in its continuing effort to encourage use of belts to reduce automobile fatalities and injuries.
  • Altitude Tolerance of General Aviation Pilots with Normal or Partially Impaired Spirometric Function
    Altitude Tolerance of General Aviation Pilots with Normal or Partially Impaired Spirometric Function
    Lategola M.T. ;
    Flux M.
    1977-07-01 | PDF
    The altitude tolerance of 10 spirometrically impaired (SI) general aviation pilots with an average forced midexpiratory flow (FEF sub 25-75%) value of 65.1 percent was compared to that of 10 spirometrically normal (SN) pilots. Cardiorespiratory parameters assessed at ground level (GL) and at 8,000- and 12,500-ft altitudes were blood pressure, pulmo ...
  • Refractive error characteristics of early and advanced presbyopic individuals
    Refractive error characteristics of early and advanced presbyopic individuals.
    Welsh, K.W. ;
    Rasmussen, P.G.
    1977-07-01 | PDF
    The frequency and distribution of ocular refractive errors among middle-aged and older people were obtained from a nonclinical population holding a variety of blue-collar, clerical, and technical jobs. The 422 individuals ranged in age from 35 to 69 years and were volunteers for several vision research studies conducted primarily at the FAA Civil A ...
  • Effects of lithium carbonate on performance and biomedical functions
    Effects of lithium carbonate on performance and biomedical functions.
    Higgins, E. ;
    Chiles, W.
    1977-07-01 | PDF
    The effects of a single 600-mg dose of lithium carbonate were evaluated in a study of 15 healthy, normal male subjects. Subjects were studied, on two occasions, by utilizing a double-blind design--once receiving the lithium carbonate and once receiving a lactose placebo.Measurements were made of1.complex performance, using the CAMI Multiple Task Pe ...
  • Emergency escape of handicapped air travelers
    Emergency escape of handicapped air travelers.
    Blethrow, J.G. ;
    Garner, J.D.
    1977-07-01 | PDF
    This report describes a study conducted by the Civil Aeromedical Institute to investigate potential problems related to the emergency evacuation of civil aircraft carrying handicapped passengers.The study includes an analysis of the movement of individual handicapped subjects in an aircraft cabin and the results of evacuation tests in which a porti ...
  • Operational Experience with Concurrent Flow Reserved Lanes
    Operational Experience with Concurrent Flow Reserved Lanes
    Fuhs, Charles A. ;
    Fitzgerald, A. V.
    1977-07-01 | PDF
    This report presents an evaluation of the concurrent flow reserved lane concept to improve the capacity of urban traffic facilities in metropolitan areas. The purpose of this effort is to evaluate the applicability of this concept to urban freeways in Texas. The concurrent flow reserved lane concept is described, and some of the advantages and limi ...
  • Readability of alphanumeric characters having various contrast levels as a function of age and illumination mode
    Readability of alphanumeric characters having various contrast levels as a function of age and illumination mode.
    Welsh, K.W. ;
    Rasmussen, P.G.
    1977-07-01 | PDF
    Readability data of alphanumeric characters that vary in figure-to- ground contrast ratio were obtained from 36 subjects; 12 subjects were placed in each of three age groups (20-25 yr, 40-45 yr, and 60-65 yr). Minimum illuminance required to identify all contrast combinations was determined at a viewing distance of 40 cm (15.7 in) under dim white a ...
  • Objective methods for developing indices of pilot workload
    Objective methods for developing indices of pilot workload.
    Chiles, W. Dean
    1977-07-01 | PDF
    This paper discusses the various types of objective methodologies that either have been or have the potential of being applied to the general problem of the measurement of pilot workload as it occurs on relatively short missions or mission phases. Selected studies that have dealt with the workload measurement problem or some similar problem are rev ...
  • Perceived orientation of a runway model in nonpilots during simulated night approaches to landing
    Perceived orientation of a runway model in nonpilots during simulated night approaches to landing.
    Mertens, Henry W.
    1977-07-01 | PDF
    Illusions due to reduced visual cues at night have long been cited as contributing to the dangerous tendency of pilots to fly too low during night landing approaches. The cue of motion parallax (a difference in rate of apparent movement of objects in the visual field) is frequently suggested as contributing to visual judgments of glide path but has ...
  • The effect of increased monitoring load on vigilance performance using a simulated radar display
    The effect of increased monitoring load on vigilance performance using a simulated radar display.
    Thackray, Richard I. ;
    Bailey, J. Powell
    1977-07-01 | PDF
    The present study examined the extent to which level of target density influences the ability to sustain attention to a complex monitoring task requiring only a detection response to simple stimulus change. The visual display was designed to approximate a futuristic, highly automated air traffic control radar display containing computer-generated a ...
  • An Analysis of Transportation Planning Effectiveness
    An Analysis of Transportation Planning Effectiveness
    Stearns, Mary D. ;
    Cooper, Edward
    1977-07-01 | PDF
    The report documents a novel methodology and analysis procedure for measuring a program's effect, and it is based on data from case studies of a representative group of twenty urban areas, conducted during 1976, which are reported in a companion report titled: Transportation Planning Effectiveness: Twenty Case Studies. The twenty urban areas repres ...
  • Effectiveness of Highway Arterial Lighting Final Report
    Effectiveness of Highway Arterial Lighting: Final Report
    Janoff, M. S. ;
    Koth, B.
    1977-07-01 | PDF
    This research was undertaken to evaluate the cost-benefits of arterial highway lighting treatments in terms of traffic safety and energy usage. The results have shown that total nighttime dry weather accidents are inversely related to visibility, higher visibility resulting in fewer accidents. Areas with high population densities have a much higher ...
  • Effectiveness of Highway Arterial Lighting Design Guide
    Effectiveness of Highway Arterial Lighting: Design Guide
    Janoff, M. S. ;
    Koth, B.
    1977-07-01 | PDF
    This research was undertaken to evaluate the cost-benefits of arterial lighting treatments in terms of traffic safety and energy use. As a result, a Design Guide has been developed to assist potential users in conducting cost-benefit analyses of lighting changes at specific locations. This Design Guide provides instructions for using a computer pro ...
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