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Showing 36241 - 36260 of 36747 results
  • An Investigation of the Feasibility of Improving Freeway Operation by Staggering Working Hours
    An Investigation of the Feasibility of Improving Freeway Operation by Staggering Working Hours
    Santerre, Gary Lee
    1967-01-01 | PDF
    This research was primarily designed for two purposes. The first objective was to investigate the feasibility of staggering working hours in Houston, Texas. The second objective was to evaluate the impact that staggered working hours of selected traffic generators would have on the morning peak period operation of the Gulf Freeway in Houston.
  • The Folded Two Stage Railway Classification Yard
    The Folded Two Stage Railway Classification Yard
    Davis, Llewellyn C
    1967-01-01 | PDF
    This report is divided into two parts. Part 1 explains the need for railway classification yards, what they do, and how they do it. Part 2 presents a concept for a novel “folded two-stage yard” which embodies a back-and-forth approach to switching cars through a central switching area. Unlike existing yards that rely on either switch engines or gra ...
  • Traffic Safety a National Problem A Symposium
    Traffic Safety, a National Problem: A Symposium
    National Academy of Engineering
    1967-01-01 | PDF
    The National Academy of Engineering selected the subject, traffic safety, to be the theme of its spring symposium in April 1966. A comprehensive view of the current status of accident reporting, the legal environment, types and severity of injuries caused by different impacts, and the emergency services needed or available at the site of accidents ...
  • Durability of lightweight concrete Phase II wetting and drying tests Phase III freezing and thawing tests
    Durability of lightweight concrete : Phase II : wetting and drying tests, Phase III : freezing and thawing tests.
    Rushing, Hollis B.
    1966-12-01 | PDF
    This report describes a laboratory research program on the durability of lightweight concrete. Two phases of a three phase study are covered by this report, while the remaining phase is still under study. The two phases being reported are Phase II - Wetting and Drying Tests of Lightweight Concrete and Phase III - Freezing and Thawing Tests of Light ...
  • Evaluation of various padding materials for crash protection
    Evaluation of various padding materials for crash protection.
    Swearingen, John J.
    1966-12-01 | PDF
    Thirty-seven different materials and combinations of materials were impacted with an instrumented dummy head at 15 ft/sec and at 30 ft/sec. Peak g forces, rise times, and deceleration durations were determined for both impact velocities on each test specimen and compared to base line impacts on the rigid base structure to determine the degree of en ...
  • Evaluation of the gyratory compactor for use in designing asphaltic concrete mixtures final report
    Evaluation of the gyratory compactor for use in designing asphaltic concrete mixtures : final report.
    Arena, Philip J.
    1966-12-01 | PDF
    The primary objective of this study was to evaluate the gyratory kneading compactor and to investigate the possibilities and capabilities of this type of equipment.Curves were developed for six different asphaltic concrete mixes with varying compactive efforts and asphalt contents. These curves indicated that a wide range of compactive efforts can ...
  • Effect of Degree of Synthetic Lightweight Aggregate PreWetting on the FreezeThaw Durability of Lightweight Concrete
    Effect of Degree of Synthetic Lightweight Aggregate Pre-Wetting on the Freeze-Thaw Durability of Lightweight Concrete
    Kanabar, C. N. ;
    Ledbetter, W. B.
    1966-12-01 | PDF
    The scope of this research study was to extend the knowledge gained from previous studies on the durability of structural lightweight concrete, and to attempt to correlate (a) degree of pre-wetting of the synthetic lightweight coarse aggregate, (b) type of synthetic light: weight coarse aggregate, (c) compressive strength of lightweight concrete an ...
  • Progress Report on the Relationship Between Laboratory and Field Performance of Lightweight Aggregate Concrete
    Progress Report on the Relationship Between Laboratory and Field Performance of Lightweight Aggregate Concrete
    Buth, Eugene ;
    Ledbetter, W. B.
    1966-11-01 | PDF
    Twenty-one, four-inch cores were taken from seven locations on the bridge deck. Each core was subjected to visual and low magnification examination, load deformation determinations and impact hammer readings. Thin sections were made from cores from each location and studied under the petrographic microscope. Some of the larger pieces of aggregate w ...
  • Users Manual for the Texas Large Systems Traffic Assignment Programs
    User’s Manual for the Texas Large Systems Traffic Assignment Programs
    Stover, Vergil G. ;
    Blumentritt, Charles W.
    1966-11-01 | PDF
    This edition (November 1966) of the User's Manual is indicated for use with program library tape Version II of 15 November 1966. As programs are modified, new pages for this manual will be prepared as necessary and distributed with subsequent library program tapes. All revised and additional pages will have the revision (issue) date in the upper le ...
  • The Development of an Automatic Freeway Merging Control System
    The Development of an Automatic Freeway Merging Control System
    Drew, Donald R. ;
    McCasland, William R.
    1966-11-01 | PDF
    This paper presents the operational aspects of the merging control equipment in use at the Telephone Road interchange on the inbound Gulf Freeway. The equipment is being used to evaluate several control theories but has not been installed for a period of time sufficient to allow a report on the comparison of theories at this time. This comparison o ...
  • Freeway Ramp Control Reduces Frequency of RearEnd Accidents
    Freeway Ramp Control Reduces Frequency of Rear-End Accidents
    Radke, Milton L.
    1966-11-01 | PDF
    The prime objective of this study was to investigate the accident frequency on the inbound section of the Gulf Freeway before the entrance ramps were controlled and then evaluate the effectiveness of ramp control in reducing the frequency of rear-end accidents as a result of the improved level of service on the facility.
  • Quality control analysis part III concrete and concrete aggregates
    Quality control analysis : part III : concrete and concrete aggregates.
    Shah, S. C.
    1966-11-01 | PDF
    This is the third and last report on the Quality Control Analysis of highway construction materials.It deals with the statistical evaluation of data from several construction projects to determine the basic pattern of variability with respect to slump of concrete and concrete aggregates.The analysis indicated 1) that the frequency distribution of m ...
  • Interim Report on the Laboratory Considerations for the Use of Synthetic Aggregates for HotMix Asphalt Pavements
    Interim Report on the Laboratory Considerations for the Use of Synthetic Aggregates for Hot-Mix Asphalt Pavements
    Gallaway, Bob M. ;
    Harper, William J.
    1966-11-01 | PDF
    This report includes the laboratory evaluation of lightweight aggregates from seven sources, six in Texas and one in Louisiana. Two of these materials have beer field tested on an extensive scale, although the field evaluations reported herein are limited to one source of material.
  • Problems in Aerial Application Histochemistry of Weil Stain on Liver
    Problems in Aerial Application: Histochemistry of Weil Stain on Liver
    Clark, George
    1966-11-01 | PDF
    By use of histochemical blocking and extraction procedures, it was possible to show that the cytoplasmic compound to which the Weil stain attaches is a lipid containing a secondary amine. It is suggested that the compound could be further characterized chemically. This material is increased in dieldrin and endrin poisoning and decreased in cold ada ...
  • Annual Report of the Maritime Administration 1966 MARAD 1966
    Annual Report of the Maritime Administration 1966 [MARAD 1966]
    United States. Maritime Administration
    1966-11-01 | Annual Reports of the Maritime Administration | PDF
    Report of the Maritime Administration covering activities of the fiscal year ended June 30, 1966.
  • Pilot vision considerations the effect of age on binocular fusion time
    Pilot vision considerations : the effect of age on binocular fusion time.
    Melton, Carlton E. ;
    Wicks, Marlene
    1966-10-01 | PDF
    The study provides data regarding the relationship between vision performance and age of the individual. It has direct application to pilot visual tasks with respect to instrument panel displays, and to controller visual tasks in association with radar equipment. It also relates to the visual parameter important to the determination of a physiologi ...
  • A computer program to analyze bending of bent caps
    A computer program to analyze bending of bent caps.
    Matlock, Hudson ;
    Ingram, Wayne B.
    1966-10-01 | PDF
    This report is one of a series of developments planned to facilitate theuse of computers in the analysis of highway bridge structures. It specificallyconcerns a computer program for the bending analysis of bent caps.The development of this program began in June 1963 under sponsorship of theTexas Highway Department, Research Project 3-5-63-56, in co ...
  • Photometric Studies of the Austin Moonlight Tower Lighting Systems
    Photometric Studies of the Austin “Moonlight” Tower Lighting Systems
    Rowan, Neilon J. ;
    Walton, Ned E.
    1966-10-01 | PDF
    Through the cooperation of the city of Austin, Texas and the Texas Highway Department, the Texas Transportation Institute conducted a study of photometrics at the location of one of the 150-foot "moonlight" towers in Austin. This tower was equipped with six vertical burning mercury vapor lamps mounted in radial reflectors at uniform angular spacing ...
  • Considerations for the Installation of UTurns at Freeway Interchanges
    Considerations for the Installation of U-Turns at Freeway Interchanges
    Wilson, Sammy L. ;
    Radke, Milton L.
    1966-10-01 | PDF
    It was the objective of this study to investigate the U-turn movement of frontage road traffic in order to determine its effect on the delay produced at signalized intersections and to determine minimum design criteria required to facilitate this movement at freeway interchanges.
  • A Recommended Synthetic Coarse Aggregate Classification System
    A Recommended Synthetic Coarse Aggregate Classification System
    Ledbetter, W. B. ;
    Gallaway, B. M.
    1966-10-01 | PDF
    The Texas Transportation Institute, in cooperation with the Texas Highway Department and U. S Bureau of Public Roads, is conducting research on synthetic aggregates for highway use. We are involved in facets of the use of synthetic aggregates from structural grade portland cement concrete to asphaltic concrete and to flexible base. Several research ...
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