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Showing 27301 - 27320 of 35628 results
  • Fabricating and testing lowpermeability concrete for transportation structures
    Fabricating and testing low-permeability concrete for transportation structures.
    Ozyildirim, C.
    1998-08-01 | PDF
    Many concrete structures are not providing the expected service life. Repairs are costly, cause inconvenience to motorists, and raise safety concerns. The durability of concrete depends on, among other things, the ability to resist the penetration of harmful solutions, e.g., chlorides. Recently, pozzolanic materials have been widely used to decreas ...
  • Cargo liability study
    Cargo liability study
    United States. Department of Transportation. Office of the Assistant Secretary for Transportation Policy
    1998-08-01 | PDF
    In preparation of this report, DOT has solicited and received extensive data and comments from shippers, carriers, forwarders, and the insurance industry. DOT held a public meeting on February 23, 1996 and received public comments at that meeting. Written comments were received from approximately 350 participants during the remainder of 1996 and 19 ...
  • Crossroads 2000 proceedings table of contents
    Crossroads 2000 proceedings : table of contents
    Iowa State University
    1998-08-01 | PDF
    This compilation of papers from the Crossroads 2000 Proceedings were presented from August 19-20, 1998 at Iowa State University at Ames, Iowa. From the main conference web page, link to the table of contents, which contains hypertext links to each paper.
  • Demographic factors and traffic crashes Part 1 descriptive statistics and models
    Demographic factors and traffic crashes. Part 1, descriptive statistics and models
    Aty, M. A. ;
    Radwan, A. E.
    1998-08-01 | PDF
    This research analyzes the Department of Highway Safety and Motor Vehicle's (DHSMV) 1993 to 1995 crash data. There are four demographic variables investigated throughout the research, which are age, gender, race, and residency. To show general trends, descriptive statistics of crash rates was first introduced using exposure data. To identify high r ...
  • Construction and comparison of Louisianas conventional and alternative base courses under accelerated loading
    Construction and comparison of Louisiana's conventional and alternative base courses under accelerated loading
    Metcalf, J. M. ;
    McMoran, F.
    1998-08-01 | PDF
    The report describes the first testing series, Phase, of the first project, Experiment 1, with the Louisiana Transportation Research Center Accelerated Loading Facility. The background to the project is described and details of the trial pavements site and the ALF are given. The objective of the first experiement is "to evaluate alternative soil-ce ...
  • Development of South Dakota accident reduction factors
    Development of South Dakota accident reduction factors
    Tople, Andrew R.
    1998-08-01 | PDF
    This report offers the methodology and findings of the first project to develop Accident Reduction Factors (ARFs) and Severity Reduction Ratios (SRRs) for the state of South Dakota. The ARFs and SRRs of this project focused on Hazard Elimination and Safety (HES) projects located within the state of South Dakota. A literature search for information ...
  • Local Transportation Agency Training and Technical Assistance Needs Assessment
    Local Transportation Agency Training and Technical Assistance Needs Assessment
    Kopren, Toran ;
    Huft, David
    1998-08-01 | PDF
    This report assesses training needs for the South Dakota Local Transportation Assistance Program (SDLTAP). The results and findings of the assessment are to be used by SDLTAP to better their organization in meeting the needs of their clients. They will also be helpful in conducting an assessment in the future. Three objectives were to be accomplish ...
  • Investigations of Plastic Composite Materials for Highway Safety Structures
    Investigations of Plastic Composite Materials for Highway Safety Structures
    Dutta, Piyush K.
    1998-08-01 | PDF
    This report presents a basic overview and assessment of different concepts and technologies of using polymer composites in structures generally used for highway safety. The structural systems included a highway barrier guardrail with its posts and blockouts, sign posts, concrete reinforcing rebars, breakaway couplers, and crushable plastic cushions ...
  • Highway Operations
    Highway Operations
    Texas Transportation Institute. Texas A&M University
    1998-08-01 | PDF
    This document replaces the Texas Highway Operations Manual which was issued in August 1992. This edition provides a means of implementing the results of research tasks performed as part · of this study and completed since the publication of that manual. The Highway Operations Volume of the Traffic Operations Manual was developed for the Texas Depar ...
  • Midwest Regional Rail Initiative Executive Report
    Midwest Regional Rail Initiative Executive Report
    Transportation Economics and Management Systems, Inc.  ...
    1998-08-01 | PDF
    This report includes an initial strategic assessment of the Midwest Regional Rail System concept. An extensive range of issues is addressed including infrastructure and operational requirements, level of travel market demand, financing alternatives, and system-wide costs and benefits. The report also contains a preliminary business plan. A Steering ...
  • Impact of LocalShort Haul Operations on Driver Fatigue Task 1 Focus Group Summary and Analysis Report
    Impact of Local/Short Haul Operations on Driver Fatigue, Task 1: Focus Group Summary and Analysis [Report]
    Hanowski, Richard J. ;
    Wierwille, Walter W.
    1998-08-01 | PDF
    Eleven focus groups were held in eight cities across five states. The purpose of these sessions was to gain an understanding, from the local/short haul (L/SH) drivers' perspective, of the general safety concerns related to the short-haul trucking industry and, specifically, the degree to which fatigue plays a role. Eight-type L/SH drivers participa ...
  • GIS for Floodplain Mapping in Design of Highway Drainage Facilities
    GIS for Floodplain Mapping in Design of Highway Drainage Facilities
    Maidment, David ;
    Tate, Eric
    1998-08-01 | PDF
    Since the 1960s, civil engineers have employed a variety of computer models for stream floodplain analysis. HEC-2 and its Windows counterpart, HEC-RAS, have been the principal models used for such analyses. A significant deficiency of these programs is that the location of structures impacted by floodwaters, such as roads, homes, and businesses, ca ...
  • Pavement smoothness indices research brief
    Pavement smoothness indices : research brief.
    Heidenreich, Wes ;
    Hunt, Liz
    1998-08-01 | PDF
    Many in the asphalt industry believe that initial pavement smoothness directly relates topavement life. Public perception of smoothness is also important. Oregon is interested indetermining the appropriate method of measurement to quantify smoothness in terms ofperformance and public perception. Several smoothness indices exist, however, they need ...
  • Evaluation of Potential Traffic Signal Warrant Considerations
    Evaluation of Potential Traffic Signal Warrant Considerations
    Carlson, P. J. ;
    Hawkins, H. G.
    1998-08-01 | PDF
    This report describes a 15-month project conducted for the Texas Department of Transportation (TxDOT) to evaluate various considerations for inclusion into the traffic signal warranting procedure. Researchers conducted several research tasks including surveys of TxDOT, other state DOTs, and city engineers. Analyses were also conducted to investigat ...
  • Threecable barrier makes I5 safer
    Three-cable barrier makes I-5 safer.
    Oregon. Dept. of Transportation. Research Unit
    1998-08-01 | PDF
    The cable median barrier system has been effective in preventing crossover accidents at the selected location, from December 1996 through March 1998. Of the 53 barrier impacts, 21 potential crossovers were restrained from entering the opposing traffic lanes. Only three vehicles went through the cable barrier system. The two that underrode the cable ...
  • General aviation accidents the United States Air Force Aero Club solution
    General aviation accidents : the United States Air Force Aero Club solution
    Brandt, K. E.
    1998-08-01 | PDF
    Aviation if an intrisically safe mode of travel. In 1994, the United States Air Force system of Aero Clubs put forth substantial effort to put a program in place (Fly Smart) to improve flying safety in it aircraft. This study compares the accident rates of Aero Club aircraft with rates seen in general aviation. A comparison is also made of the year ...
  • Statistical loads data for Boeing 737400 aircraft in commercial operations
    Statistical loads data for Boeing 737-400 aircraft in commercial operations
    Rustenburg, J. ;
    Skinn, D.
    1998-08-01 | PDF
    The primary objective of this research is to support the FAA Airborne Data Monitoring Systems Research Program by developing new and improved methods and criteria for processing and presenting large commercial transport airplane flight and ground loads usage data. The scope of activities performed involved (1) defining the service related factors w ...
  • Resilient Moduli of Raw and Stabilized Aggregate Bases and Evaluation of Layer Coefficients for AASHTO Flexible Pavement Design Volume 1
    Resilient Moduli of Raw and Stabilized Aggregate Bases and Evaluation of Layer Coefficients for AASHTO Flexible Pavement Design: Volume 1
    Zaman, Musharraf M. ;
    Laguros, Joakim G.
    1998-08-01 | PDF
    A comprehensive study involving laboratory testing of resilient moduli (MR) of aggregate materials, determination of layer coefficients, and their application in AASHTO flexible pavement design was conducted.
  • Demand Forecasting for Rural Transit 199808
    Demand Forecasting for Rural Transit [1998-08]
    Casavant, Kenneth L. ;
    Painter, Kathleen M.
    1998-08-01 | PDF
    Demand forecasting for rural transit will aid planners in the allocation of resources for this population. A workbook produced by a recent federal effort to develop demand forecasting for rural passenger transportation serves as the starting point of this.
  • Understanding traffic variations by vehicle classifications
    Understanding traffic variations by vehicle classifications
    United States. Federal Highway Administration
    1998-08-01 | PDF
    To provide a better understanding of how short-duration truck volume counts can be used to accurately estimate the key variables needed for design, planning, and operational analyses, the Long-Term Pavement Performance (LTPP) program recently completed a study entitled "Vehicle Volume Distributions by Classification" (FHWA-PL-97-025, June 1997). Th ...
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