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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 34021 - 34040 of 35438 results
  • Truck and Rail Shipments of Grain from North Dakota Country Elevators 19721973
    Truck and Rail Shipments of Grain from North Dakota Country Elevators 1972-1973
    Tosterud, Robert J
    1974-10-01 | PDF
    The major emphasis in this report is to illustrate the distribution methods and patterns of grain from North Dakota origins. In addition, to demonstrate the seasonality of grain shipments from North Dakota trends in shipments by months are identified. The patterns of distribution and monthly shipments for 1972-73 are compared to previous years' dat ...
  • The Effect of Varying the Modulus and Thickness of Asphaltic Concrete Surfacing Materials
    The Effect of Varying the Modulus and Thickness of Asphaltic Concrete Surfacing Materials
    Lu, Danny Y. ;
    Scrivner, Frank H.
    1974-10-01 | PDF
    Presented in this report is a theoretical study of the effects of varying the modulus and thickness of asphalt concrete surfacing materials. Three typical flexible pavement design problems at two levels of hot mix asphaltic concrete (HMAC) elastic modulus are analyzed using linear elastic theory. Specific findings are: (1) the use of an HMAS modulu ...
  • Automated Design of Continuous Bridges with Precast Prestressed Concrete Beams Volume One Design Considerations
    Automated Design of Continuous Bridges with Precast Prestressed Concrete Beams: Volume One, Design Considerations
    Jones, Harry L. ;
    Ingram, Leonard L
    1974-10-01 | PDF
    A computer program has been developed in this study to perform the calculations for the design of continuous prestressed concrete bridge girders. The continuous girder is constructed from simple span precast concrete I-shaped beams made continuous by supplementary reinforcing in the deck and the ends of the precast beams. Specification for the desi ...
  • Development of Urban Traffic Management and Control Systems
    Development of Urban Traffic Management and Control Systems
    McCasland, William R.
    1974-10-01 | PDF
    Studies of urban traffic operations were conducted on the freeways of Houston as part of a research program to develop traffic surveillance, motorist communications and services, and traffic control systems for the improvement of the level of service of existing urban street and highway facilities. The research study concentrates on facilities, equ ...
  • TirePavement Friction as a Function of Vehicle Maneuvers
    Tire-Pavement Friction as a Function of Vehicle Maneuvers
    Hayes, Gordon G.
    1974-10-01 | PDF
    Limit maneuvers were performed on different wet pavements with disparate passenger vehicles, and the vehicle available acceleration were compared with pavement friction indicators. Reasonably conservative estimates were made of vehicle cornering and/or stopping capability as a function of skid number measured at 40 mph. These estimates can be used ...
  • A Guide to the Selection of HighStrength Anchor Bolt Materials
    A Guide to the Selection of High-Strength Anchor Bolt Materials
    Hasselwander, G. B. ;
    Jirsa, James O.
    1974-10-01 | PDF
    An evaluation of the suitability of various high-strength materials for anchor bolt applications was made. A selected group of materials meeting ASTM Standard Specifications were tabulated. Based on the material properties, availability, and cost, several of the materials were determined to be most suitable for anchor bolt materials. To further ass ...
  • Behavioral autonomic and subjective reactions to low and moderatelevel simulated sonic booms a report of two experiments and a general evaluation of sonic boom startle effects
    Behavioral, autonomic, and subjective reactions to low- and moderate-level simulated sonic booms : a report of two experiments and a general evaluation of sonic boom startle effects.
    Thackray, Richard I. ;
    Touchstone, R. Mark
    1974-09-01 | PDF
    Two separate studies are reported. The first attempted to determine a sonic boom exposure level below which startle reactions would not occur. Subjects were exposed indoors to six simulated sonic booms having various outside overpressures. In the second study, subjects were exposed indoors to a series of 12 simulated booms in order to assess habitu ...
  • Aircraftpilot and other preemployment experience as factors in the selection of air traffic controller trainees
    Aircraft-pilot and other pre-employment experience as factors in the selection of air traffic controller trainees.
    Cobb, Bart B. ;
    Nelson, Peter L.
    1974-09-01 | PDF
    This longitudinal study of 4,092 ATCS trainees examines the validities of various types of aviation-related experience, separately and in combination, for prediction of success in FAA ATC work--with success defined as retention status within the air traffic control system several years after entry into training.Of the 4,092 subjects, 1,740 entered ...
  • Roadway Maintenance Evaluation Users Manual
    Roadway Maintenance Evaluation User’s Manual
    Epps, J. A. ;
    Meyer, A. H.
    1974-09-01 | PDF
    The information contained in this manual defines a method for conducting a visual evaluation of. the roadway. The purpose of this evaluation is to provide information that can be used together with certain other data for maintenance management purposes. The manual has been developed as a reference to be used in conjunction with a training school an ...
  • Evaluation of FullScale Experimental Concrete Highway Finishes
    Evaluation of Full-Scale Experimental Concrete Highway Finishes
    Ledbetter, W. B. ;
    Meyer, A. H.
    1974-09-01 | PDF
    Results on an evaluation of two sets of full-scale experimental concrete test sections are summarized. Eighteen experimental concrete finishes were evaluated in terms of skid resistance under standard trailer water conditions and under simulated rainfall conditions. In addition, the change in texture depths and skid values with time were measured. ...
  • Seventh Annual Report of the US Department of Transportation 1973
    Seventh Annual Report of the U.S. Department of Transportation: 1973
    United States. Department of Transportation
    1974-08-23 | U.S. Department of Transportation Annual Reports | PDF
    Submitted in compliance of Section 11 of the Department of Transportation Act, the seventh annual report of the Department of Transportation discusses the Department's achievements during Fiscal Year 1973.
  • Vibratory roller evaluation study interim report No 1
    Vibratory roller evaluation study : interim report No. 1.
    Glascock, Lacey A.
    1974-08-01 | PDF
    The Louisiana Department of Highways has in progress a two phase program to evaluate the use of vibratory rollers in the compaction of asphaltic concrete pavements. Phase one on the first construction project is now complete with eight different vibratory rollers having participated. Emphasis of the evaluation is centered upon two requirements cont ...
  • Jobrelated attitudes of nonjourneyman FAA air traffic controllers and former controllers a sex comparison
    Job-related attitudes of non-journeyman FAA air traffic controllers and former controllers : a sex comparison.
    Mathews, John J. ;
    Collins, William E.
    1974-08-01 | PDF
    ATC attrition rates have been investigated recently for sex differences in the proportion of trainees completing FAA Academy training; the percentage of women who subsequently left ATC work was twice that of men. In the present comparison, questionnaires concerning aspects of job-related attitudes were given to 56 male and 56 female former trainees ...
  • Rapid field method for determining the polish susceptibility of carbonate aggregates
    Rapid field method for determining the polish susceptibility of carbonate aggregates.
    Patty, Tom S.
    1974-08-01 | PDF
    A quick and simple method by which limestones and related carbonatepaving aggregates can be rated as to their relative susceptibility topolishing has been successfully applied to a wide number of aggregatesources used on Texas Highway projects. The technique involves takinga small representative sample of the aggregate and subjecting it to adilute ...
  • Final Report for Project 356356
    Final Report for Project 3-5-63-56
    Panak, John J.
    1974-08-01 | PDF
    The research completed under this project was directed toward the development of basic analytical methods using computer simulation for highway bridges, pavements, and similar structures. This report presents a summary of the major computer developments made during the course of the project. Each development is described briefly and those that are ...
  • Linear Elastic Layer Theory as a Model of Displacements Measured Within and Beneath Flexible Pavement Structures Loaded by the Dynaflect
    Linear Elastic Layer Theory as a Model of Displacements Measured Within and Beneath Flexible Pavement Structures Loaded by the Dynaflect
    Scrivner, Frank H. ;
    Michalak, Chester H.
    1974-08-01 | PDF
    Presented in this report are the results of an investigation of the capability of linear elastic theory to predict measured displacements on the surface, within·, and beneath flexible pavement structures. In measuring predictive capability, the yard stick used was replication error. Sources of data were an NCHRP project, the AASHO Road Test, and th ...
  • Correlation of the Texas Highway Department Cone Penetrometer Test with UnconsolidatedUndrained Shear Strength of Cohesive Soils
    Correlation of the Texas Highway Department Cone Penetrometer Test with Unconsolidated-Undrained Shear Strength of Cohesive Soils
    Hamoudi, Manaf M. ;
    Coyle, Harry M.
    1974-08-01 | PDF
    Correlations were established between the Texas Highway Department Cone Penetrometer Test and the unconsolidated-undrained shear strength for cohesive soils. Both field and laboratory investigations were conducted to obtain the data necessary to establish the correlations. The field investigations included seven borings taken at four different site ...
  • Influence of Water Depths on Friction Properties of Various Pavement Types
    Influence of Water Depths on Friction Properties of Various Pavement Types
    Gallaway, Bob M. ;
    Rose, Jerry G.
    1974-08-01 | PDF
    Reported herein are the results of the final phase of THD Study 2-8-69-138. This phase of the study is concerned with the effect of various water depths (obtained with a rain simulator) on the friction properties of various pavement textures at different levels of vehicular speeds and tire-tread depths, tire pressures, and tire types. Equations rel ...
  • MidBlock Access Effects on Arterial Streets
    Mid-Block Access Effects on Arterial Streets
    Exter, J. O. ;
    Stover, Vergil G.
    1974-08-01 | PDF
    The combined function of the urban arterial, that is, providing for traffic movement and land access, continues to be a major problem. Arterials are designed and built to serve primarily the movement function. As the abutting land develops, access to individual land parcels tends to reduce the effectiveness of the arterial in serving its primary fu ...
  • CostEffectiveness Program for Roadside Safety Improvements on Texas Highways Volume 1 Procedures Manual
    Cost-Effectiveness Program for Roadside Safety Improvements on Texas Highways Volume 1: Procedures Manual
    Weaver, Graeme D. ;
    Post, Edward R.
    1974-08-01 | 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 highways--both controlled and non-controlled a ...
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