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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 30361 - 30380 of 35412 results
  • Comparison of Portable Crewmember Protective Breathing Equipment CPBE Designs
    Comparison of Portable Crewmember Protective Breathing Equipment (CPBE) Designs
    Wilcox, Bruce ;
    McLean, Garnet
    1993-04-01 | PDF
    CPBE presently certified for transport category aircraft employ 3 types of oxygen production systems: chlorate candle, potassium superoxide, and compressed oxygen. CPBE performance was evaluated to expose significant differences based on this distinction. CPBE tests employing humans were conducted in accordance with FAA Technical Standard Order C-1 ...
  • Human Factors in Aviation Maintenance Phase Two Progress Report
    Human Factors in Aviation Maintenance, Phase Two: Progress Report
    Galaxy Scientific Corporation
    1993-04-01 | PDF
    In this second phase of research on Human Factors in Aviation Maintenance, the emphasis has evolved from problem definition to development of demonstrations and prototypes. These demonstrations include a computer-based training simulation for troubleshooting an airliner environmental control system and a software system to store and display documen ...
  • New VASCARplus timing mechanism test results
    New VASCAR-plus timing mechanism test results
    Howe, J.G.
    1993-04-01 | PDF
    In a previous study (Analysis of VASCAR, DOT HS 807-748, May 1993), it was found that the VASCAR-plus timing mechanism was biased against the speed limit violator. The VASCAR speed reading was higher than the actual speed. At that time, it was suggested by the Law EnforcementCommunity that the timing mechanism be modified so that it would be in fav ...
  • Implementation Guidelines for Retiming Freeway Corridors
    Implementation Guidelines for Retiming Freeway Corridors
    Fambro, Daniel B. ;
    Sunkari, Srinivasa R
    1993-04-01 | PDF
    This document provides guidelines and procedures for the retiming of freeway corridors, including procedures for data collection, and the types and amounts of data to be collected; the analytical procedures and software packages that are available for signal retiming projects; and examples of step-by-step applications for each type of signal retimi ...
  • Effectiveness of Rubberized Asphalt Chip Seals on Bridges
    Effectiveness of Rubberized Asphalt Chip Seals on Bridges
    Ashworth, T ;
    Ashworth, E
    1993-04-01 | PDF
    Chloride ions, which are derived from the salts used for winter highway maintenance, penetrate into the concrete of pavements and bridge decks. This results in corrosion of the rebar and ultimately in damage to the concrete. The subject of this report is a research project in which we attempted to determine the extent to which the presence of humid ...
  • The Performance of Flexible Erosion Control Materials
    The Performance of Flexible Erosion Control Materials
    Godfrey, S.H. ;
    Landphair, H. C.
    1993-04-01 | PDF
    A series of evaluation procedures to determine the field performance of flexible erosion control materials were conducted at the TTI/TxDOT Hydraulics and Erosion Control Laboratory. The objectives of the study were to determine the effect of flexible materials on the germination and growth of native grasses, as well as to determine the effectivenes ...
  • Implementation of the Micro PAVER Pavement Management System on Texas Division of Aviation Airfields
    Implementation of the Micro PAVER Pavement Management System on Texas Division of Aviation Airfields
    Freeman, Tom ;
    Dresser, George B.
    1993-04-01 | PDF
    The Texas Department of Transportation (TxDOT) routinely rates public use airports using the Pavement Condition Index (PCI) distress rating and evaluation method. The PCI method rates overall pavement condition and indicates the structural integrity and operational surface condition of the pavement. The Corps of Engineers developed the PAVER manage ...
  • Mailbox Bracket Crash Tests An Interim Report
    Mailbox Bracket Crash Tests: An Interim Report
    Ross, Jr., Hayes E.
    1993-04-01 | PDF
    This is an interim report, summarizing the nine crash tests conducted to date on mailbox brackets. Each test was conducted and evaluated in accordance with nationally recognized guidelines as contained in NCHRP Report 230. In each test a car weighing approximately 1,800 lb. impacted the test article at approximately 60 mph. Initial impact point of ...
  • Police Allocation Manual Users Guide Determination of the Number and Allocation of Personnel for Patrol Services for State Police Departments Special Version April 1993
    Police Allocation Manual User's Guide: Determination of the Number and Allocation of Personnel for Patrol Services for State Police Departments (Special Version - April 1993)
    Northwestern University (Evanston, Ill.). Traffic Institute
    1993-04-01 | PDF
    The Police Allocation Manual User's Guide (herein after referred to as the Guide) is intended as a companion document to the Police Allocation Manual (PAM), Special Version, which can be used to determine the number and allocation of personnel for police traffic services for state police departments. It is important to note that the Guide has been ...
  • Police Allocation Manual Determination of the Number and Allocation of Personnel for Patrol Services for State Police Departments Special Version September 1991
    Police Allocation Manual: Determination of the Number and Allocation of Personnel for Patrol Services for State Police Departments (Special Version, September 1991)
    Northwestern University (Evanston, Ill.). Traffic Institute
    1993-04-01 | PDF
    The Police Allocation Manual (PAM) is designed to be used by state police agencies, or divisions within those agencies, whose mission includes the delivery of police traffic services. The Manual is designed to help such agencies address two key resource allocation questions: 1. What is the total number of officers (i.e., troopers, field supervisors ...
  • Results of DATAS Investigation of ATCRBS Environment at Los Angeles International Airport
    Results of DATAS Investigation of ATCRBS Environment at Los Angeles International Airport
    Wapelhorst, Leo ;
    Pagano, Thomas
    1993-04-01 | PDF
    Federal Aviation Administration (FAA) Technical Center Data Link project personnel designed, developed, and deployed a system to record Traffic Alert and Collision Avoidance System (TCAS) activity. Through coordinated efforts with TCAS project personnel, the Data Link project design team modified the existing Data Link Test and Analysis System (DAT ...
  • Communications Handbook for Traffic Control Systems
    Communications Handbook for Traffic Control Systems
    Gordon, Robert L. ;
    Reiss, Robert A.
    1993-04-01 | PDF
    The communications system generally proves the most critical and expensive element of a traffic control system/IVHS. Therefore the successful design, implementation, and operation of the communications system become key to the effectiveness of the overall traffic control system. This handbook provides an easy-to-use reference on communications for ...
  • Development of a Type I PM Cement
    Development of a Type I (PM) Cement
    Ramakrishnan, V.
    1993-03-31 | PDF
    Alkali-silica reactivity (ASR) produces a major problem in concrete structures. This report presents an experimental investigation to identify a natural pozzolan and to determine the optimum quantity that can be blended with cement to produce a Type I (PM) cement for inhibiting the ASR. For comparative evaluation a Class F fly ash has also been inv ...
  • Development of a Type I PM Cement Supplementary Report 4 Physical and Elastic Properties of Natural Pozzolan Blended TypeIP Cement Concretes
    Development of a Type I (PM) Cement – Supplementary Report 4 — Physical and Elastic Properties of Natural Pozzolan Blended (Type-IP) Cement Concretes
    Ramakrishnan, V. ;
    Sure, V R
    1993-03-31 | PDF
    Alkali reactive sands or coarse aggregates, when used in concrete structures, produce severe deterioration because of expansion and cracking. The use of pozzolan blended cement is an attractive solution 10 mitigate this problem. This represents the results of an experimental investigation to evaluate the characteristics of pozzolan blended cement c ...
  • Development of a Type I PM Cement Supplementary Report 2 A Comparative Study of the Physical Properties of Six Natural Pozzolan Blended TypeIP Cements
    Development of a Type I (PM) Cement – Supplementary Report 2 — A Comparative Study of the Physical Properties of Six Natural Pozzolan Blended Type-IP Cements
    Ramakrishnan, V. ;
    Sainath, Anne
    1993-03-31 | PDF
    Cement contains many ingredients of which alkalies are minor compounds. Alkali reactive sands or coarse aggregates when used in concrete structures cause a major problem due to cracks formed by the expansive reaction between alkalies in cement and reactive forms of silica in aggregates. Use of natural pozzolans as a cement replacement is effective ...
  • Development of a Type I PM Cement Supplementary Report 1 Investigation of Locally Available Natural Pozzolans
    Development of a Type I (PM) Cement – Supplementary Report 1 — Investigation of Locally Available Natural Pozzolans
    Rahn, Perry H ;
    Holm, Ronald A
    1993-03-31 | PDF
    A reconnaissance survey of potential sources of pozzolans within 100 miles of Rapid City resulted in the selection of 26 sites. Most of these sites are volcanic tuffs of shales. Pozzolanic activity index data show that the Pierre Shale, "fire clay" from the Lakota Formation and the Rockyford Ash are the most suitable. A detailed geologic descriptio ...
  • Development of a Type I PM Cement Supplementary Report 5 Feasibility of Mining of Selected Pozzolans
    Development of a Type I (PM) Cement – Supplementary Report 5 — Feasibility of Mining of Selected Pozzolans
    Rahn, Perry H
    1993-03-31 | PDF
    A detailed assessment of the mineability of ten potential locations of pozzolans was made. The deposits are all volcanic ash beds within the Lakota Formation, a cretaceous sedimentary rock which crops out as a hogback, which encircles the Black Hills. The most favorable deposit is located about 10 miles south of the Cement Plant at Rapid City. Ther ...
  • Development of a Type IP Cement Supplementary Report 3 Effect of Natural Pozzolans and Fly Ash on Alkali Silica Reactivity
    Development of a Type IP Cement Supplementary Report 3: Effect of Natural Pozzolans and Fly Ash on Alkali Silica Reactivity
    Ramakrishnan, V ;
    Prasad, Nunna
    1993-03-31 | PDF
    Alkali-silica reactivity (ASR) produces a major problem in concrete structures. This report presents an experimental investigation to identify a natural pozzolan and to determine the optimum quantity that can be blended with cement to produce a Type IP cement for inhibiting the ASR For comparative evaluation a Class F fly ash has also been investig ...
  • Goods Movement Regional Analysis and Database Final Report
    Goods Movement: Regional Analysis and Database Final Report
    Turnquist, Mark A. ;
    Meyburg, Arnim
    1993-03-26 | PDF
    The project reported here was undertaken to create and test methods for synthesizing truck flow patterns in urban areas from partial and fragmentary observations. More specifically, the project sought to develop a way to estimate origin-destination (OD) trip matrices from data typically available (link volumes, classification counts, cordon counts ...
  • Location of Highway Attributes by Global Positioning Study Volume 1 Final Report
    Location of Highway Attributes by Global Positioning Study. Volume 1; Final Report
    Lewis, Bob ;
    Beanland, Bill
    1993-03-16 | PDF
    The South Dakota Department of Transportation (SDDOT) uses a sign-oriented, link-node signpost location method in which "uniform" Mileage Reference Markers (MRM) are placed at approximate intervals of one mile and "special non-uniform" MRMs are placed at intersections, structures, county lines, municipal and urban limits and at roadway discontinuit ...
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