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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>EVALUATION OF LOW COST WIM ALTERNATIVES</title>
      <link>https://trid.trb.org/View/492946</link>
      <description><![CDATA[This report evaluates the feasibility of providing effective truck weighing devices at a cost that would allow widespread implementation of in-motion truck weighing in Texas. The following technologies were investigated: (1) Piezoelectric cable; (2) Capacitive weighmat WIM sensor; (3) bending plate WIM transducer]]></description>
      <pubDate>Wed, 17 Nov 1999 00:00:00 GMT</pubDate>
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      <title>EVALUATION OF WEIGH-IN-MOTION SYSTEMS. FINAL REPORT</title>
      <link>https://trid.trb.org/View/362428</link>
      <description><![CDATA[The objective of this research was to evaluate low cost weigh-in-motion systems.  The three systems evaluated were (1) a capacitance weigh mat system, (2) a bridge weighing system, and (3) a piezoelectric cable sensor system.  All three systems have a two-lane capability.  An evaluation was made of (1) the quality of the data, (2) the performance of the equipment, (3) the applications of the equipment and its ease of use, and (4) the format of the data and its usefulness.  Although objective data were used when possible, the majority of the evaluation is subjective.  The quality of the data from each of the three systems is about the same.  The piezoelectric cable system provides slightly lower quality data than the other two systems.  The equipment of the capacitance weigh mat performed well; that of the bridge system was adequate; and there was concern about the durability of the piezoelectric cable system. Because of the tradeoffs between the capacitance weigh mat system and the bridge system, it is difficult to rank them. The piezoelectric cable system's sensors are permanently installed; therefore, it is not as portable as the other two systems.  With regard to the format of the data and its usefulness (which are dependent mostly on the software and not the sensors), the capacitance weigh mat system is flexible and provides individual truck records in two formats, the bridge system provides the most comprehensive tables, and the piezoelectric cable system is limited and depends on other software to generate additional tables. Suggestions are made about how to use the systems and how to improve their performance.]]></description>
      <pubDate>Sun, 31 Mar 1996 00:00:00 GMT</pubDate>
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      <title>EVALUATION OF LOW COST WIM ALTERNATIVES. FINAL REPORT</title>
      <link>https://trid.trb.org/View/299173</link>
      <description><![CDATA[Truck weight data are required for pavement and bridge design, truck size and weight enforcement, and the development of administrative policy and legislation.  The efficient collection and analysis of these data require that truck weighing-in-motion (WIM) equipment be used. Unfortunately, the high cost of these devices (greater than $50,000 per unit) has prohibited the large scale implementation of WIM technology.  Lower cost WIM systems are also necessary to provide new or expanded data required by both the Long Term Pavement Performance (LTPP) monitoring element of the Strategic Highway Research Program (SHRP) and implementation of the provisions of the recently issued Federal Highway Administration (FHWA) Traffic Monitoring (TM) Guide.  Several possible technologies exist for low cost WIM systems.  One of these, piezoelectric cable, was investigated in a research effort jointly sponsored by the States of Iowa and Minnesota and FHWA and in other work in the State of Washington and several European countries.  A second approach is an inexpensive capacitive weighmat WIM sensor and associated electronics developed for FHWA.  A third alternative is a reduced cost configuration of the bending plate WIM transducer manufactured and distributed by the PAT Equipment Corporation.  Each of these was evaluated in this study to determine its usefulness in providing effective truck weighing devices at a cost that would allow widespread implementation of in-motion truck weighing programs in Texas.]]></description>
      <pubDate>Fri, 30 Nov 1990 00:00:00 GMT</pubDate>
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