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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 33281 - 33300 of 35412 results
  • The Cost and Operations of Exempt Motor Carriers in North Dakota
    The Cost and Operations of Exempt Motor Carriers in North Dakota
    Cosgriff, John G
    1978-11-01 | PDF
    The overall objective of the study is to determine and evaluate the structure and the cost of operation of that portion of the exempt for-hire motor carrier industry which provides a transportation service for the marketing system of North Dakota grain from country elevators to terminal markets.
  • Development of a Mixture Design Procedure for Recycled Asphalt Mixtures
    Development of a Mixture Design Procedure for Recycled Asphalt Mixtures
    Perez, Ignacio ;
    Kennedy, Thomas W.
    1978-11-01 | PDF
    This report summarizes the findings of a study to evaluate the fatigue and elastic characteristics of recycled asphalt pavement materials and to develop a preliminary mixture design procedure. Mixtures with different types and amounts of additives were evaluated in terms of their engineering properties. The primary methods of evaluation were the st ...
  • Effectiveness of Alternative Skid Reduction Measures Volume I Evaluation of Accident RateSkid Number Relationships
    Effectiveness of Alternative Skid Reduction Measures: Volume I: Evaluation of Accident Rate-Skid Number Relationships
    Blackburn, R. R. ;
    Harwood, D.W.
    1978-11-01 | PDF
    Relationships were developed between wet-pavement accident rate and skid number for various combinations of highway type, area type (urban/rural) and traffic volume. Accident rate, skid number and related data were collected for two one-year periods on 428 highway sections located in 16 states. An extensive statistical analysis of the data was cond ...
  • Effectiveness of Alternative Skid Reduction Measures Volume II BenefitCost Model
    Effectiveness of Alternative Skid Reduction Measures: Volume II: Benefit-Cost Model
    St. John, A. D. ;
    Blackburn, R. R.
    1978-11-01 | PDF
    A computerized benefit-cost model was designed for use by state highway departments in the selection of accident-reduction counter-measures to be applied to Investigated sites. Two types of wet-pavement accident reduction countermeasures are in current use: those that increase frictional supply and those that decrease frictional demand. Although th ...
  • Effectiveness of Alternative Skid Reduction Measures Volume IV Criteria For Improvement of Pavement Surface Macrotexture
    Effectiveness of Alternative Skid Reduction Measures: Volume IV: Criteria For Improvement of Pavement Surface Macrotexture
    Blackburn, Robert R. ;
    Hardwood, D. W.
    1978-11-01 | PDF
    This volume presents a guide to the role of pavement macrotexture in pavement skid resistance and accidents. An overview of the fundamentals of tire-pavement skid resistance is presented. The methods of measuring macrotexture in the field and in the laboratory are described based on a review of relevant literature. The measurement methods currently ...
  • Effectiveness of Alternative Skid Reduction Measures Volume III Users Manual
    Effectiveness of Alternative Skid Reduction Measures: Volume III: Users Manual
    St. John, A. D. ;
    Blackburn, Robert R.
    1978-11-01 | PDF
    A computerized benefit-cost model is presented for use by state highway departments in the selection of accident-reduction countermeasures to be applied to investigated sites. The model has capability to evaluate both surface modification countermeasures, which increase frictional supply, and geometric and traffic control countermeasures, which red ...
  • Land Use Impact of Widening North Texas Avenue in a Developing Area of Bryan Texas
    Land Use Impact of Widening North Texas Avenue in a Developing Area of Bryan, Texas
    Cosby, Pamela J. ;
    Womack, Katie N.
    1978-11-01 | PDF
    Previous studies on the effects of highway construction upon land use have focused mainly upon the effects of the construction of new highways. In view of a new emphasis upon upgrading and expanding existing facilities rather than building new ones, the need arises for information concerning the effects of such improvements upon land use. This info ...
  • Analytical and Experimental Assessment of Highway Impact on Air Quality
    Analytical and Experimental Assessment of Highway Impact on Air Quality
    Bullin, J. A. ;
    Polasek, J. C.
    1978-10-27 | PDF
    Air Quality measurements along Texas freeways have been completed at six sites, representing "at grade", "elevated", and "cut" roadbed configurations, and representing "coastal plain", "inland plain", "hill country", and "mountain" climates in Texas. Measurements at each site consisted of carbon monoxide concentrations at ten downwind. and two upwi ...
  • Quantifying the Economics in Comparing Speed Control Systems
    Quantifying the Economics in Comparing Speed Control Systems
    Wong, Peter J
    1978-10-02 | PDF
    Herein, we present some preliminary thoughts on how to quantify into economic terms the performance of various speed control systems. The performance of a speed control system has the following three elements: reliable switching, proper coupling and high hump-speed. Unfortunately, these three elements tend to work against each other, i.e. high hump ...
  • The optical properties of smokeprotective devices
    The optical properties of smoke-protective devices.
    Vaughan, John A.
    1978-10-01 | PDF
    Optical properties of 13 smoke-protective devices were determined. The devices tested comprised 8 goggles and 5 fullface oxygen masks (3 rigid one-piece masks and 2 flexible hoods). Those properties evaluated were: (i) light transmission, (ii) optical haze, (iii) prismatic deviation, (iv) refractive power, (v) optical distortion, and (vi) surface c ...
  • Stress in air traffic controllers a restudy of 32 controllers 5 to 9 years later
    Stress in air traffic controllers : a restudy of 32 controllers 5 to 9 years later.
    Melton, C.E. ;
    McKenzie, J.M.
    1978-10-01 | PDF
    Thirty-two subjects who had participated in air traffic controller stress studies 5-9 years earlier were restudied with regard to urinary excretion of 17-ketogenic steroids, epinephrine, and norepinephrine. All subjects showed decreases in excretion of 17-ketogenic steroids. Eight of the subjects had taken noncontroller jobs; these subjects showed ...
  • Evaluation of Problems Associated With Transporting North Dakota Potatoes
    Evaluation of Problems Associated With Transporting North Dakota Potatoes
    Kuntz, Daniel
    1978-10-01 | PDF
    This publication examines the problems associated with transporting North Dakota potatoes in the following chapters: (I) The North Dakota Potato Industry; (II) North Dakota Transportation: The Current Situation: A - Rail Transportation, B - Truck Transportation, C - Truck Regulatory Practices, D - Trailer-on-Flat-Car Transportation; (III) Alternati ...
  • A method to evaluate performance reliability of individual subjects in laboratory research applied to work settings
    A method to evaluate performance reliability of individual subjects in laboratory research applied to work settings.
    Jennings, Alan E.
    1978-10-01 | PDF
    This report presents a method that may be used to evaluate the reliability of performance of individual subjects, particularly in applied laboratory research. The method is based on analysis of variance of a tasks-by-subjects data matrix, with all scores standardized. If all tasks are parallel, then the average correlation among tasks is an inverse ...
  • Design and Construction of Compacted Shale Embankments Vol 4 Filed and Laboratory Investigations Phase III
    Design and Construction of Compacted Shale Embankments: Vol. 4. Filed and Laboratory Investigations, Phase III
    Strohm, William E.
    1978-10-01 | PDF
    This fourth report covers Phase III field sampling and pressuremeter tests at six shale embankments and laboratory tests on undisturbed embankment samples and on unweathered samples of parent shales used in the embankments. The six embankments, in Tennessee, West Virginia, Kentucky, Ohio (two), and Indiana were selected to cover a range in age and ...
  • HPMS A Statistical Analysis 1978
    HPMS A Statistical Analysis (1978)
    Kancler, Anthony P.
    1978-10-01 | PDF
    The HFMS effort is directed to the design and development of a continuing frame of reference which is capable of assessing the performance of highway systems with respect to the safe, efficient, and economical, and which is also a basis for forecasting the potential impacts of future alternative programs and policies on such performance.
  • An Investigation of the Effectiveness of Existing Bridge Design Methodology in Providing Adequate Structural Resistance to Seismic Disturbances Phase VI Seismic Response of Bridges Case Studies
    An Investigation of the Effectiveness of Existing Bridge Design Methodology in Providing Adequate Structural Resistance to Seismic Disturbances: Phase VI: Seismic Response of Bridges - Case Studies
    Imbsen, Roy A. ;
    Nutt, Richard V.
    1978-10-01 | PDF
    Presented are the results of six case studies conducted on each of three bridges (the Route 80 Onramp Undercrossing, the Northwest Connector Overcrossing, and the Southwest Connector Overcrossing designed by the California Department of Transportation) when subjected to strong seismic excitation. The dynamic responses of each bridge for separate ex ...
  • Land Use Impact of Widening East 29th Street in a Developed Residential Area of Bryan Texas
    Land Use Impact of Widening East 29th Street in a Developed Residential Area of Bryan, Texas
    Cosby, Pamela J. ;
    Buffington, Jesse L.
    1978-10-01 | PDF
    Previous studies on the effects of highway construction upon land use have focused mainly upon the effects of the construction of new highways. In view of a new emphasis upon upgrading and expanding existing facilities rather than building new ones, the need arises for information concerning the effects of such improvements upon land use. This repo ...
  • Tubular WBeam Bridge Rail
    Tubular W-Beam Bridge Rail
    Hirsch, T. J. ;
    Panak, John J.
    1978-10-01 | PDF
    Bridge engineers of the Texas State Department of Highways and Public Transportation (SDHPT) have long desired a low service level bridge rail for use on culverts and low bridges. It was desired that such a rail would be economical and compatible in strength and stiffness with the standard Texas Guard Fence (12 ga. W-beam, mounted on 7 in. diameter ...
  • Beneficial Use of Sulphur in SulphurAsphalt Pavements
    Beneficial Use of Sulphur in Sulphur-Asphalt Pavements
    Jacobs, C. Y. ;
    Newcomb, D. E.
    1978-10-01 | PDF
    This is the final report for the funding year's effort of testing and evaluation of the sand-asphalt-Sulphur field trials on U.S. 77 in Kenedy County, Texas and the freeze-thaw testing of Sulphur concrete. Therefore, this report consists of two parts. Part A pertains to data which have been collected on the Kenedy County field trials. This segment ...
  • Generic Description of Conventional Retarder Control System
    Generic Description of Conventional Retarder Control System
    Wong, Peter
    1978-09-28 | PDF
    The basic building blocks of a conventional retarder control system are described from a generic-functional viewpoint. The central function of a retarder system is “speed control management” which takes inputs from the following functions: weight determination, rollability prediction, weather modification, distance-to-couple measurement, and operat ...
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