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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 34441 - 34460 of 35438 results
  • Design Charts for Minor Service Structure Foundations
    Design Charts for Minor Service Structure Foundations
    Lytton, Robert L.
    1971-09-01 | PDF
    This report presents a series of design charts which allow an entirely graphical procedure to be followed in selecting the proper size of drilled shaft foundation for standard Texas Highway Department signs. The procedure uses a boring log of Texas Highway Department cone penetrometer measurements and a graphical overlay-slide device which was deve ...
  • Operating Manual for the Texas Trip Distribution Package
    Operating Manual for the Texas Trip Distribution Package
    Benson, J. D. ;
    Bell, Charles E.
    1971-09-01 | PDF
    The Texas Trip Distribution Package is a collection of computer programs designed to perform trip distributions featuring the application of a constrained interactance model. Other programs, available in the package, provide full support. This manual describes the performance capabilities, execution procedures data specifications, and computational ...
  • Marine Weather Dissemination Systems Study Volume III Systems Effectiveness Measurements
    Marine Weather Dissemination Systems Study: Volume III - Systems Effectiveness Measurements
    Crowe, B.J. ;
    Holliman, E.
    1971-08-16 | PDF
    Systems effectiveness of marine weather dissemination systems is measured against carefully established criteria. First level effectiveness, accessibility, is measured in terms of coverage, audience, and system schedule. Second level effectiveness is examined in terms of timeliness. The analysis addresses systems operated by the U.S. Coast Guard, t ...
  • Marine Weather Dissemination Systems Study Volume II Systems Characterization
    Marine Weather Dissemination Systems Study: Volume II - Systems Characterization
    Crowe, B.J. ;
    Holliman, E.
    1971-08-16 | PDF
    Systems for disseminating weather information to marine users are described in detail. Coast Guard and National Weather Service transmitting facilities are listed, giving location, name, call sign, transmitting power, mode and frequency, and antenna height. Coastal display stations and telephone facilities are also listed. Facilities serving off-sh ...
  • Marine Weather Dissemination Systems Study Volume V Guidelines for Future Coast Guard Research and Development
    Marine Weather Dissemination Systems Study: Volume V - Guidelines for Future Coast Guard Research and Development
    Crowe, B.J. ;
    Holliman, E.
    1971-08-16 | PDF
    Systems objectives for advanced alerting and dissemination systems for recreational boatmen are established. Parametric data are presented as a baseline for future initial design efforts on systems to disseminate weather and environmental information to marine users and to alert them to impending hazardous conditions. Areas are identified in which ...
  • Marine Weather Dissemination Systems Study Volume IV Recommendations for Change
    Marine Weather Dissemination Systems Study: Volume IV - Recommendations for Change
    Crowe, B.J. ;
    Holliman, E.
    1971-08-16 | PDF
    Potential improvements in existing and proposed weather dissemination systems are examined. Recommendations are made for changes in the policies, facilities and procedures of the U.S. Coast Guard and other government and non- government agencies aimed at effecting realistic improvements in system service. Service to coastal, off-shore and high seas ...
  • Marine Weather Dissemination Systems Study Volume I Executive Summary
    Marine Weather Dissemination Systems Study: Volume I - Executive Summary
    Crowe, B.J.
    1971-08-16 | PDF
    Work performed during a study of Marine Weather Dissemination Systems is summarized. The study examined existing and planned systems for disseminating weather and other environmental information to marine users, and made objective, comparative measurements of the effectiveness of each of the systems. Based on these analyses, recommendations were ma ...
  • A Sensitivity Analysis of Flexible Pavement System FPS2
    A Sensitivity Analysis of Flexible Pavement System FPS2
    Kher, Ramesh K. ;
    McCullough, B. Frank
    1971-08-01 | PDF
    Flexible Pavement System FPS2 is a design concept formulated into a computer program which analyzes flexible pavements utilizing an overall systems approach to the problem. The program uses 45 different types of inputs in the broad categories of design constraints, design variables, and cost variables. The design alternatives are analyzed by using ...
  • Evaluation of OnFreeway Traffic Control at an Interchange
    Evaluation of On-Freeway Traffic Control at an Interchange
    Lautzenheiser, Roy C. ;
    Henderson, Donald M.
    1971-08-01 | PDF
    Due to imbalance of traffic demand during peak hours and to a lane reduction at merge areas, traffic congestion is occurring at major interchanges during peak period operation. The premise is that better interchange operation is achieved by traffic control or minor geometric modification. In Houston, the merge areas at two interchanges were conside ...
  • The Effects of Entrance Ramp Closure on Freeway Operation during Morning Peak Periods
    The Effects of Entrance Ramp Closure on Freeway Operation during Morning Peak Periods
    Lautzenheiser, Roy C.
    1971-08-01 | PDF
    Ramp metering, which is a regulatory but voluntary form of control, is effective for improving freeway operations. However, traffic input demand frequently exceeds the capacity of some freeway bottlenecks resulting in upstream congestion. This study discusses the use of positive ramp closure during peak periods to further reduce traffic input to th ...
  • A Determination Framework for Wet Weather Speed Limits
    A Determination Framework for Wet Weather Speed Limits
    Glennon, John C.
    1971-08-01 | PDF
    This report develops determination charts for wet weather speed limits. These charts are based on a composite of frictional requirements for passing, emergency stopping, and emergency path-correction maneuvers. Determination charts for highway curves are also presented.
  • An Investigation of the Applicability of Acoustic Pulse Velocity Measurements to the Evaluation of the Quality of Concrete in Bridge Decks
    An Investigation of the Applicability of Acoustic Pulse Velocity Measurements to the Evaluation of the Quality of Concrete in Bridge Decks
    Swift, Gilbert ;
    Moore, William M.
    1971-08-01 | PDF
    The compressional wave velocity was measured and compared with several other significant properties of concrete specimens, using a wide variety of concrete compositions. Measured velocities in concretes containing like coarse aggregates were found to decrease with loss of strength. In all concretes tested, the elastic modulus could be estimated sat ...
  • Urban Traffic Noise Reduction Final Report
    Urban Traffic Noise Reduction: Final Report
    Woods, Donald L. ;
    Young, Murray F.
    1971-08-01 | PDF
    This report presents the findings of Project 2-8-71-166 and documents the execution of the research program in accordance with the project objectives. The project activity was divided into three major segments and reported accordingly. In Research Report 166-1 the human tolerance to traffic noise was examined and recommendations made dealing with t ...
  • Application of Closed Circuit Television for Traffic Surveillance in Texas
    Application of Closed Circuit Television for Traffic Surveillance in Texas
    McCasland, William R. ;
    Biggs, Raymond G.
    1971-08-01 | PDF
    Closed circuit television (CCTV) has been used for surveillance of traffic and transportation facilities for many years. However, the number of operating systems is few because their effectiveness as a long-term surveillance system has been suspect due to the inclusion of human observers in the surveillance loop. The use of CCTV for short intensive ...
  • Digital Computer Programs for the Ramp Metering System on the Gulf Freeway
    Digital Computer Programs for the Ramp Metering System on the Gulf Freeway
    Ritch, Gene P.
    1971-08-01 | PDF
    Ramp metering has proven to be an effective means of improving the operational efficiency of an over-crowded urban freeway. This report discusses the digital computer programs used to implement freeway ramp control on a section of the inbound Gulf Freeway in Houston, Texas. The operational characteristics of the supporting detection, transmission, ...
  • Torsional Strength of Prestressed Concrete Bridge Girders
    Torsional Strength of Prestressed Concrete Bridge Girders
    Buth, Eugene ;
    Furr, Howard L.
    1971-08-01 | PDF
    Two Texas Highway Department type B prestressed concrete bridge girders were tested to determine their torsional strength. Applied torque, angle of twist and strains in the concrete were determined. The theoretical strength and torque-rotation relationships were calculated by classical elastic theory. Experimental and theoretical torque-rotation re ...
  • Alcohol and disorientationrelated responses IV Effects of different alcohol dosages and display illumination tracking performance during vestibular stimulation
    Alcohol and disorientation-related responses. IV, Effects of different alcohol dosages and display illumination tracking performance during vestibular stimulation.
    Gilson, Richard D. ;
    Schroeder, David J.
    1971-07-01 | PDF
    A previous CAMI laboratory investigation showed that alcohol impairs the ability of men to suppress vestibular nystagmus while visually fixating on a cockpit instrument, thus degrading visual tracking performance (eye-hand coordination) during angular acceleration. Reduced display illumination, independently, has also been shown to degrade tracking ...
  • The spiral aftereffect III Some effects of perceived size retinal size and retinal speed on the duration of illusory motion
    The spiral aftereffect : III, Some effects of perceived size, retinal size, and retinal speed on the duration of illusory motion.
    Mehling, Kevin D. ;
    Collins, William E.
    1971-07-01 | PDF
    Many safety problems encountered in aviation have been attributed to visual illusions. One of the various types of visual illusions, that of apparent motion, includes as an aftereffect the apparent reversed motion of an object after it ceases real movement.The study examined some effects of perceived size, perceived distance, and perceived stimulus ...
  • Attitudes and motivational factors in terminal area air traffic control work
    Attitudes and motivational factors in terminal area air traffic control work.
    Smith, Roger C. ;
    Cobb, Bart B.
    1971-07-01 | PDF
    A sample of 614 journeymen terminal ATCSs at 17 high-density IFR airports, and 514 ATC trainees were administered a questionnaire which asked them to list what they liked best and what they liked least about ATC work in general; in addition, ATCSs made similar lists for work at their assigned facilities.Responses were surveyed for clusters, and nin ...
  • Civil aeromedical standards for generaluse aerospace transportation vehicles the spaceshuttle followon
    Civil aeromedical standards for general-use aerospace transportation vehicles : the space-shuttle follow-on.
    Mohler, Stanley R. ;
    Gerathewohl, Siegfried J.
    1971-07-01 | PDF
    Second-generation general-use aerospace transportation vehicles will evolve, and aerospace medical specialists must provide timely medical criteria for (a) occupant selection, (b) vehicle design features, and (c) operational guidelines. Incorporation of this aeromedical data will result in (a) enhanced mission success and mission efficiency, and (b ...
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