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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 31021 - 31040 of 35440 results
  • Inhalation Toxicology X Times to Incapacitation for Rats Exposed Continuously to Carbon Monoxide Acrolein and to Carbon MonoxideAcrolein Mixtures
    Inhalation Toxicology: X. Times to Incapacitation for Rats Exposed Continuously to Carbon Monoxide, Acrolein, and to Carbon Monoxide-Acrolein Mixtures
    Crane, Charles R. ;
    Sanders, Donald C.
    1990-12-01 | PDF
    Laboratory rats were exposed to experimental atmospheres of (a) carbon monoxide (CO) in air, (b) acrolein in air, and (c) to mixtures of CO and acrolein in air. The toxic potency of each of the three types of environments was evaluated toxicokinetically by measurement of time-to-incapacitation (ti) as a function of toxic gas concentrations. Regress ...
  • An investigation of the hydraulic performance of culvert grates
    An investigation of the hydraulic performance of culvert grates.
    Kranc, S.C. ;
    Anderson, M.W.
    1990-11-01 | PDF
    An experimental investigation of the hydraulic performance of culvert endsections is reported. Of particular concern is the effect on performance that the addition of safety gratings may have. The head-discharge characteristics for various model inlet treatments were measured to determine inlet performance. Hydraulic models of various end sections ...
  • TRIPCAL5 Users Manual
    TRIPCAL5 User’s Manual
    Pearson, David ;
    Bell, Charles E.
    1990-11-01 | PDF
    In 1989, the Texas Department of Transportation, through the Texas Transportation Institute, began an overall effort to evaluate and update the practice of transportation planning in the state to equal or exceed current state-of-the-art practice in transportation planning. A new trip generator program, TRIPCAL5, was subsequently developed to replac ...
  • Design and Manufacture of Superior Asphalt Binders
    Design and Manufacture of Superior Asphalt Binders
    Davison, Richard R. ;
    Bullin, Jerry A.
    1990-11-01 | PDF
    The principal objectives of this study were to use supercritical fractionation of asphalt and a study of fraction properties to gain a deeper understanding of what determines asphalt properties and how the asphalt composition can be manipulated to improve properties. This report describes the first attempts to fractionate asphalt, characterize the ...
  • Acoustic Traffic Detection and Classification System
    Acoustic Traffic Detection and Classification System
    Benson, Robert H.
    1990-11-01 | PDF
    The need for new instrumentation to sense, classify, and control increasing traffic flows has been evident for several years. In some cases, older technology (ACRS for example) has proven inadequate for projects such as counting vehicles crossing rural bridges, owing to the adverse conditions in which the instrumentation must operate. Currently ava ...
  • The HEEMIII BenefitCost Computer Program
    The HEEM-III Benefit-Cost Computer Program
    Memmott, Jeffery L.
    1990-11-01 | PDF
    This report documents a computer program, HEEM-III, that will analyze proposed added-capacity, bypass (new location), High Occupancy Vehicle (HOV), interchange, and railroad grade separation projects. The Program represents a completely new program as compared to the HEEM-II computer program. The major changes include use of hourly volumes to calcu ...
  • Raised Pavement Marker Reflectivity
    Raised Pavement Marker Reflectivity
    Pezoldt, V. J. ;
    Koppa, R. J.
    1990-11-01 | PDF
    In recent years, problems associated with retaining retroreflective raised pavement markers (RPMs) on Texas highways have to a large extent been successfully resolved. Problems with the maintenance of acceptable levels of RPM reflectivity, on the other hand, have remained persistent. This report summarizes a variety of activities, including determi ...
  • Considerations in Developing a Strategic Arterial Street System
    Considerations in Developing a Strategic Arterial Street System
    Urbanik II, Thomas ;
    Ward, William V
    1990-11-01 | PDF
    Recently, attention has been directed towards the urban arterial street system to provide greater mobility, specifically in the form of a network of high-mobility arterial streets. These streets were named strategic arterials and would operate with greater capacity and operating speeds than current principal arterials, however, they would not fulfi ...
  • Research notes microsilica modified concrete for bridge deck overlays
    Research notes : microsilica modified concrete for bridge deck overlays.
    Oregon State Highway Division, Materials and Research Section
    1990-11-01 | PDF
    Laboratory studies have shown that microsilica concrete (MC) has sufficient strength and impermeability to substitute for Latex modified concrete (LMC) in bridge deck overlays. In addition, manufacturers of microsilica admixtures state that MC can be mixed in batch plants, like Portland cement concrete (PCC). This many be an advantage over LMC on c ...
  • Evaluation of performance based approach for determining contribution of environmental factors to pavement deterioration H P R implementation study
    Evaluation of performance based approach for determining contribution of environmental factors to pavement deterioration : H P & R implementation study.
    Furber, Arthur M.
    1990-11-01 | PDF
    State Legislation requires that cost responsibility studies be available for the 1991 and 1993 Legislative sessions. Part of this legislative requirement includes the need to re-evaluate and establish a sound basis for the weight-mile tax. To be fair and equitable, this tax should reflect the relative contribution of environment factors and traffic ...
  • Modulus 40 Expansion and Validation of the Modulus Backcalculation System
    Modulus 4.0: Expansion and Validation of the Modulus Backcalculation System
    Rohde, G. T. ;
    Scullion, Tom
    1990-11-01 | PDF
    This report describes the Texas Transportation Institute's continuing efforts to upgrade the MODULUS backcalculation system. Enhancements have been made in several areas, including: 1. Inclusion of a procedure to estimate the depth to a stiff layer. 2. A method of assessing the non-linearity of the subgrade and computation of the optimum number of ...
  • The Use of Sobriety Checkpoints for Impaired Driving Enforcement
    The Use of Sobriety Checkpoints for Impaired Driving Enforcement
    United States. Department of Transportation. National Highway Traffic Safety Administration
    1990-11-01 | PDF
    Sobriety checkpoints have been a valuable tool for law enforcement's continuing fight to remove impaired drivers from the road. The purpose of the checkpoint is twofold; to apprehend impaired drivers at the physical location of the checkpoint; and secondly, to increase the "risk of apprehension" in those who might decide to drive while impaired. Th ...
  • Selection of Air Traffic Controllers for Automated Systems Applications from Current Research
    Selection of Air Traffic Controllers for Automated Systems : Applications from Current Research
    Della Rocco, Pamela S. ;
    Manning, Carol A.
    1990-11-01 | PDF
    Over the next two decades, the Federal Aviation Administration's (FAA) plan for new automated systems will change the air traffic control specialist's (ATCS) job as many of the current controller's tasks become automated. The purpose of this paper was to review the findings from current research on selection of ATCS's that may guide the design of s ...
  • Human Factors Issues in Aircraft Maintenance and Inspection Information Exchange and Coommunications
    Human Factors Issues in Aircraft Maintenance and Inspection: “Information Exchange and Coommunications”
    Parker, James F. ;
    Shepherd, William T.
    1990-11-01 | PDF
    The Federal Aviation Administration sponsored a 2-day meeting in December 1989 as part of a continuing program to address issues of human factors and personnel performance in aviation maintenance and inspection. This meeting focused on issues of "information exchange and communications." The primary goal was to consider means of ensuring that the e ...
  • An Analysis of the Efficiency and Effectiveness of Selected Rural Transit Systems in the State of North Dakota
    An Analysis of the Efficiency and Effectiveness of Selected Rural Transit Systems in the State of North Dakota
    Bitzan, John D ;
    Tolliver, Denver D
    1990-10-01 | PDF
    This report evaluates the efficiency and effectiveness of eight of the 23 Section 18 funded transit systems operating in North Dakota.
  • Determinants of Job Satisfaction of Professional Drivers
    Determinants of Job Satisfaction of Professional Drivers
    Rodriguez, Julene M. ;
    Griffin, Gene C.
    1990-10-01 | PDF
    This report contains the results of a survey of truck drivers to determine their opinions about specific areas of their work and how important these areas are to their job satisfaction.
  • Traffic Control Guidelines for Urban Arterial Work Zones Volume 2 Appendices
    Traffic Control Guidelines for Urban Arterial Work Zones – Volume 2 Appendices
    Hawkins, Jr., H. Gene ;
    Ogden, Michael A.
    1990-10-01 | PDF
    A three-year study of urban arterial work zones is currently in progress. The objective of the study is to develop improved guidelines for selecting and implementing work zone traffic control on urban arterials. The second-year study efforts are documented in a three-volume report. The Technical Report appears in Volume 1. This document is Volume 2 ...
  • Traffic Control Guidelines for Urban Arterial Work Zones Volume 1 Technical Report
    Traffic Control Guidelines for Urban Arterial Work Zones – Volume 1 Technical Report
    Hawkins Jr, H Gene ;
    Ogden, Michael A.
    1990-10-01 | PDF
    A three-year study of urban arterial work zones is currently in progress. The objective of the study is to develop improved guidelines for selecting and implementing work zone traffic control on urban arterials. The second year study efforts are documented in a three volume report. The Technical Report appears in Volume 1, which is this document. V ...
  • Urban Arterial Work Zone Data Volume 3 Data
    Urban Arterial Work Zone Data [Volume 3, Data]
    Hawkins Jr, H Gene ;
    Ogden, Michael A.
    1990-10-01 | PDF
    A three-year study of urban arterial work zones is currently in progress. The objective of the study is to develop improved guidelines for selecting and implementing work zone traffic control on urban arterials. The second-year study efforts are documented in a three-volume report. The Technical Report appears in Volume 1 and the Appendices for Vol ...
  • A Description of HighOccupancy Vehicle Facilities in North America
    A Description of High-Occupancy Vehicle Facilities in North America
    Turnbull, Katherine F. ;
    Hanks Jr, James W.
    1990-10-01 | PDF
    This report presents a description of existing high-occupancy vehicle (HOV) facilities in operation either on freeways or in separate rights-of-way in North America. Up-to-date information is provided on the design, operations, enforcement characteristics, and current utilization rates for 40 HOV facilities in 20 metropolitan areas. The report incl ...
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