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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 34721 - 34740 of 35440 results
  • Freeway Operations on the Gulf Freeway Ramp Control System
    Freeway Operations on the Gulf Freeway Ramp Control System
    Goolsby, Merrell E. ;
    McCasland, William R.
    1969-08-01 | PDF
    The Gulf Freeway Surveillance and Control System had its beginning in 1963 when the Texas Transportation Institute began a research endeavor to investigate means of improving the level of service on urban freeways. The research was sponsored by the Texas Highway Department and U.S. Bureau of Public Roads with the objective of developing criteria fo ...
  • The Passing Maneuver as It Relates to Passing Sight Distance Standards
    The Passing Maneuver as It Relates to Passing Sight Distance Standards
    Weaver, Graeme D. ;
    Glennon, John C.
    1969-08-01 | PDF
    Current AASHO design standards for passing sight distance are based upon mathematical formulas which employ several assumptions regarding driver-vehicle characteristics. Many of the values used in establishing these standards were determined from studies conducted approximately thirty years ago. The subject of driver judgment and decision processes ...
  • Final Report Supplementary Studies in Highway Illumination
    Final Report: Supplementary Studies in Highway Illumination
    Walton, Ned E. ;
    Rowan, Neilon J.
    1969-08-01 | PDF
    This final report summarizes the findings of five and one-half years of research in highway illumination on Research Study 2-8-64-75. This research was conducted by the Texas Transportation Institute in cooperation with the Texas Highway Department and the Bureau of Public Roads. The various phases of the research have been covered in detail in twe ...
  • Consolidation Practices in Concrete Pavement Construction
    Consolidation Practices in Concrete Pavement Construction
    Ledbetter, W. B. ;
    Treybig, Harvey J.
    1969-08-01 | PDF
    The investigation involved an examination of current technology on concrete consolidation, current continuously reinforced concrete pavement (CRCP) consolidation practices in Texas and selected current concrete pavement problems through field examination and laboratory investigation. Principal conclusions reached were: (1) while the vast majority o ...
  • Deformation Measuring System for Repetitively Loaded Large Diameter Specimens of Granular Material
    Deformation Measuring System for Repetitively Loaded, Large Diameter Specimens of Granular Material
    Moore, William M. ;
    Swift, Gilbert
    1969-08-01 | PDF
    This report describes the design and evaluation of a deformation measurement system developed to observe the vertical and horizontal displacements of points on the surface of large diameter cylindrical specimens of granular material subjected to rapid, repeated load applications. The system consists of a loading apparatus, triaxial cell, measuremen ...
  • Effect of Rain on Freeway Capacity
    Effect of Rain on Freeway Capacity
    Jones, E. Roy ;
    Goolsby, Merrell E.
    1969-08-01 | PDF
    Capacity of a freeway is dependent upon physical factors of the roadway, traffic factors, and environmental factors. The effect on capacity of physical and traffic factors has been extensively investigated. However, little study has been devoted to the effect on capacity of environmental factors. This investigation determined the effect of rain, on ...
  • Performance Requirements of High Quality Flexible Pavements
    Performance Requirements of High Quality Flexible Pavements
    Bynum Jr, Douglas ;
    Traxler, R. N.
    1969-08-01 | PDF
    This study involved the development of performance requirements to alleviate thermal distress in a high-quality surface course for flexible pavement. The four requirements determined were for (1) long term or thermal equilibrium, normal strain or stress, (2) short term or transient thermal stress, (3) shear strength and (4) peel strength of the pav ...
  • Evaluation of Stopping Sight Distance Design Criteria
    Evaluation of Stopping Sight Distance Design Criteria
    Glennon, John C.
    1969-08-01 | PDF
    An examination of the state of knowledge was conducted for the purpose of evaluating design criteria for safe stopping sight distance. The evaluation was specifically concerned with driver perception-reaction time, design friction factors, assumed speeds for design, driver's eye height, and object height. The evaluation was addressed to design crit ...
  • Evaluation of organic zinc coatings final report
    Evaluation of organic zinc coatings : final report.
    Azar, David G.
    1969-08-01 | PDF
    The purpose was to find a more economical and time saving method for coating a steel bridge. This was accomplished by evaluating the cost and accelerated life of an organic zinc primer together with its appropriate topcoat versus the cost and life of the presently used Basic Lead Silico Chromate coating. Five generic types with their respective top ...
  • Evaluation of masonry coatings
    Evaluation of masonry coatings.
    Rushing, Hollis B.
    1969-08-01 | PDF
    This report describes the evaluation of five coating systems to replace the conventional Class 2 rubbed finish now required on concrete structures. The evaluation consisted of preparing test specimens with each of the five coatings and conducting absorption, freeze and thaw durability, abrasion and accelerated weathering test and comparing the resu ...
  • Methodology in the assessment of complex performance the effects of signal rate on monitoring a static process
    Methodology in the assessment of complex performance : the effects of signal rate on monitoring a static process.
    Chiles, W. Dean ;
    Bruni, Cheryl B.
    1969-08-01 | PDF
    This study concerned the rate of presentation of stimuli on a task involving the monitoring of a static process of the kind represented by aircraft warning light indicators. The task was performed concurrently with various combinations of tasks requiring the exercise of psychological functions representative of the demands placed on the human opera ...
  • Effects of alcohol on complex performance
    Effects of alcohol on complex performance.
    Chiles, W. Dean ;
    Jennings, Alan E.
    1969-08-01 | PDF
    Nine subjects were tested on a battery of tasks involving monitoring (simple reaction time, choice reaction time, and meter monitoring), two-dimensional compensatory tracking, and mental arithmetic. Three workloads were presented--monitoring plus tracking, monitoring plus arithmetic, and monitoring plus tracking plus arithmetic.The subjects ingeste ...
  • The spiral aftereffect II Some influences of visual angle and retinal speed on the duration and intensity of illusory motion
    The spiral aftereffect. II, Some influences of visual angle and retinal speed on the duration and intensity of illusory motion.
    Williams, Mary Jane ;
    Collins, William E.
    1969-08-01 | PDF
    Visual illusions have been a persistent problem in aviation research. The spiral aftereffect (SAE) is an example of one type of visual illusion--that which occurs following the cessation of real motion. Duration and intensity of the SAE was evaluated under five conditions. Results indicate that perceived (rather than physical) characteristics of th ...
  • For Release Monday July 28 1969
    For Release Monday, July 28, 1969
    United States. Department of Transportation
    1969-07-28 | PDF
    Under Secretary James M. Beggs will represent the Department of Transportation at the seventh meeting of the Joint United States-Japan Committee on Trade and Economic Affairs which will be held in Tokyo on July 29 through July 31.
  • For Release Wednesday July 2 1969
    For Release Wednesday, July 2, 1969
    United States. Department of Transportation. Office of the Secretary
    1969-07-02 | PDF
    Secretary of Transportation John A. Volpe has recently transmitted a report entitled "Transportation Information" to the Committee on Appropriations, House of Representatives. The program described in the report provides for the use of existing transportation information programs to the greatest possible extent and the filling of information gaps.
  • A Credit Quality Study of the Agricultural Trucking Industry of North Dakota
    A Credit Quality Study of the Agricultural Trucking Industry of North Dakota
    Almond, James R ;
    Nelson, David C
    1969-07-01 | PDF
    There are four factors of production or classes of resources that are needed for production of any good or service. These are land or raw materials, labor, capital, and management ability. In order to enter or remain in the trucking industry, all four factors of production must be employed and accountable. However, to increase in size, capital avai ...
  • Documentation of Input for Single Vehicle Accident Computer Program
    Documentation of Input for Single Vehicle Accident Computer Program
    Young, Ronald D. ;
    Edwards, Thomas C.
    1969-07-01 | PDF
    The information contained herein was developed on Research Project 2-5-69-140 entitled "Evaluation of the Roadside Environment by Dynamic Analysis of the Interaction Between the Vehicle, Passenger, and Roadway" which is a cooperative research study sponsored jointly by the Texas Highway Department and the U. S. Department of Transportation, Bureau ...
  • Right of Way Effects of Controlled Access Type Highway on a Farming Area in Ellis County Texas
    Right of Way Effects of Controlled Access Type Highway on a Farming Area in Ellis County, Texas
    Meuth, Hugo G. ;
    Buffington, Jesse L.
    1969-07-01 | PDF
    This study was primarily concerned with how operators in an intensive farming area adjusted to the location of Interstate Highway 35E through one or more of their operating units. Information was gathered by personal interview from the study area operators and nearby control area operators covering their 1963, 1965 and 1967 operations. These years ...
  • Compaction of Asphalt Concrete Pavements
    Compaction of Asphalt Concrete Pavements
    Epps, Jon A. ;
    Gallaway, Bob M.
    1969-07-01 | PDF
    The importance of proper compaction of asphalt pavements has been recognized for many years. Investigators have shown that pavement stability, durability, tensile strength, fatigue resistance, stiffness, and flexibility are controlled to a certain degree by the density of asphalt concrete. To ensure adequate compaction several agencies specify "in- ...
  • Erosion Control on Roadsides in Texas
    Erosion Control on Roadsides in Texas
    McCully, Wayne G. ;
    Bowmer, William J.
    1969-07-01 | PDF
    The objectives of this research were to review the established specifications for erosion control used by the Texas Highway Department and to determine better plant materials and operational practices for establishing a plant cover on roadsides.
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