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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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    <item>
      <title>BUILDINGS AND TRAFFIC VIBRATION</title>
      <link>https://trid.trb.org/View/113277</link>
      <description><![CDATA[NOT ENOUGH IS KNOWN ABOUT THE DYNAMIC RESPONSE OF BUILDINGS TO TRAFFIC-INDUCED VIBRATIONS. IN MODERN BUILDINGS, THE DAMAGE IS NOT GREAT BUT IN OLDER BUILDINGS, PARTICULARLY HISTORIC ONES IN CITIES, THE DESTRUCTION CAN BE SERIOUS. A STUDY WAS UNDERTAKEN TO DETERMINE THE VIBRATIONAL CHARACTERISTICS OF TRAFFIC AND ITS INFLUENCE ON BUILDINGS. USING A PIEZO-ELECTRIC CRYSTAL PICK-UP PLACED IN CONTACT WITH THE SOIL OR STRUCTURAL MEMBER AND A DIRECT READING VIBRATION METER CONNECTED TO INTERGRATING AND DIFFERENTIATING NETWORKS, READINGS WERE TAKEN IN THREE PLANES, MEASURING THE AMPLITUDE, VELOCITY AND ACCELERATION OF THE WAVES. IT WAS FOUND THAT THE VIBRATION INDUCED IN THE BUILDING TENDED TO LAST FOR SEVERAL SECONDS, THE MAGNITUDE OF THE EFFECT BEING GREATEST NEAR THE SOURCE. PERIODS OF VIBRATION IN A HIGH BUILDING ARE INTERSPERSED WITH PERIODS OF NON-DISTURBANCE, SO THAT IN A 19-STORY BUILDING THERE WERE ANTI-NODAL POINTS IN THE 6-8TH STORIES /AUTHOR/]]></description>
      <pubDate>Tue, 22 Mar 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/113277</guid>
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    <item>
      <title>AN ANALYSIS OF PICKUP ACCIDENT CHARACTERISTICS</title>
      <link>https://trid.trb.org/View/142348</link>
      <description><![CDATA[Accident characteristics of pickup trucks are examined using data from the National Crash Severity Study.  In comparison to passenger car accidents, pickup collisions are mainly single-vehicle, involve more rollovers, are more rural oriented, and have different patterns of occurrence, but are similar in injury severity except for fatals.  Rural pick-up accidents, in comparison to urban pickup hits, are mainly non-intersection, involve more rollovers and single-vehicle hits, and are higher in injury severity, particularly fatals.  It is concluded that car safety standards may not necessarily be effective for pickups. /A/]]></description>
      <pubDate>Tue, 27 Nov 1979 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/142348</guid>
    </item>
    <item>
      <title>MEASUREMENT OF SULFUR DIOXIDE IN AUTOMOBILE EXHAUSTS AND INDUSTRIAL STACK GASES WITH A COATED PIEZOELECTRIC CRYSTAL DETECTOR</title>
      <link>https://trid.trb.org/View/63621</link>
      <description><![CDATA[A portable instrument operating on a car battery and based on a quadrol-coated piezoelectric crystal detector has been successfully used for monitoring sulfur dioxide in auto exhausts and refinery stack gases. The concentrations of sulfur dioxide in the auto exhausts lie in the range 20-50 p.p.m. Up to 300 p.p.m. of sulfur dioxide occurs in the refinery stack gases. (Author)]]></description>
      <pubDate>Wed, 16 Feb 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/63621</guid>
    </item>
    <item>
      <title>EFFECT OF FUEL ADDITIVES ON THE CHEMICAL AND PHYSICAL CHARACTERISTICS OF PARTICULATE EMISSIONS IN AUTOMOTIVE EXHAUST</title>
      <link>https://trid.trb.org/View/135501</link>
      <description><![CDATA[This report describes work carried out on a research study to develop methods of generating, collecting, and analyzing particle emissions from automotive power plants by means sufficiently accurate and reproducible to allow the determination of the effect of fuel additives, fuel composition, engine and vehicle operating mode, and advanced emissions control hardware on exhaust particle size, concentration, and composition. Particle emissions were examined from several different engines, loaded by an engine dynamometer, and several different vehicles operated under cruise conditions, the FTP (California) cycle, and the LA-4 cycle. Particle mass measurement techniques have included tailpipe measurement methods and air dilution sampling methods using impaction separators, filters, a Beta-gauge technique, and piezoelectric cyrstal techniques. Several different fuel compositions and fuel additions were examined for their effect on particle emissions. Catalytic exhaust gas reactors were also evaluated for such effects. The applicability and validity of the techniques were substantiated and the data suggest a very significant effect of fuel additives, primarily TEL, and to a limited extent exhaust catalytic reactors on exhaust particle size, concentration, and composition. The applicability of the techniques to cycled vehicle studies has been shown. The effect of selected dilution tube variables on the physical and chemical characteristics of particulate exhaust emissions, the particulate collection capabilities of a second Beta-gauge instrument, and some thirty commercial gasoline samples procured from three different geographical regions of the United States were analyzed.  /Author/]]></description>
      <pubDate>Fri, 13 Dec 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/135501</guid>
    </item>
    <item>
      <title>MEASUREMENT OF MECHANICAL STRESSES USING PIEZOELECTRIC CRYSTALS</title>
      <link>https://trid.trb.org/View/96213</link>
      <description><![CDATA[THE POSSIBILITY WAS INVESTIGATED OF UTILIZING PIEZOELECTRIC CERAMIC MATERIALS FOR THE MEASUREMENT OF MECHANICAL PULSES GENERATED IN A ROAD SURFACE BY PASSING VEHICULAR TRAFFIC. THE DEVELOPMENT OF SUITABLE PIEZOELECTRIC TRANSDUCERS AND ASSOCIATED EQUIPMENT TO MEASURE VARIOUS PARAMETERS OF HIGHWAY TRAFFIC IS REPORTED.  VARIOUS PIEZOELECTRIC MATERIALS WERE EVALUATED AND THE EFFECTS OF TEMPERATURE, REPETITIVE LOADING, AND THE ELECTRICAL SIGNALS GENERATED BY PARTICULAR MECHANICAL PULSES WERE STUDIED.  A SYSTEM WAS DEVELOPED WHICH WAS BUILT AROUND A PIEZOELECTRIC TRANSDUCER FOR COUNTING THE NUMBER OF VEHICLE AXLES, FOR MEASURING THE WEIGHTS AND VELOCITIES OF VEHICLES, AND FOR CLASSIFYING VEHICLES ACCORDING TO WEIGHT AND NUMBER OF AXLES.  INITIAL LABORATORY STUDIES WERE FOLLOWED BY THE DEVELOPMENT OF PROTOTYPES.  FIELD TESTS ON THE FIRST PROTOTYPE DEMONSTRATED THE FEASIBILITY OF USING IT FOR COUNTING VEHICLES IN TRANSIT.  DETAILS ARE GIVEN OF THIS PROTOTYPE AND THE FUNCTIONS IT WAS DESIGNED TO PERFORM.  THE OPERATION IS DESCRIBED OF A SECOND PROTOTYPE WHICH WAS DEVELOPED TO COUNT, WEIGH AND CLASSIFY VEHICLES.  A DEFINITE STATEMENT ON THE ACCURACY OF THE EQUIPMENT IS NOT POSSIBLE IN VIEW OF THE LIMITED FIELD TESTING.  CONCLUSIONS BASED ON THE STUDY ARE PRESENTED AND RECOMMENDATIONS ARE MADE FOR FURTHER RESEARCH. THE NEED IS INDICATED FOR THOROUGH FIELD TESTS TO DETERMINE THE BEST DESIGN OF TRANSDUCERS AND ITS INSTALLATION IN THE ROAD BED.  FURTHER INFORMATION IS APPENDED ON THE STUDY OF PIEZOELECTRIC CERAMIC ENERGY CONVERSION, THE MEASUREMENT OF STATIC FORCE UTILIZING PIEZOELECTRIC SYSTEMS, AND THE BLOCK DIAGRAM AND CIRCUITS USED IN THE SECOND PROTOTYPE.]]></description>
      <pubDate>Wed, 19 Jun 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/96213</guid>
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    <item>
      <title>MEASUREMENT OF MECHANICAL STRESSES USING PIEZOELECTRIC CRYSTALS</title>
      <link>https://trid.trb.org/View/117297</link>
      <description><![CDATA[THIS RESEARCH PROGRAM WAS INITIATED WITH A FEASIBILITY STUDY ON THE POSSIBLE USES OF PIEZOELECTRIC CERAMIC MATERIALS FOR THE MEASUREMENT OF MECHANICAL ENERGIES RELATED TO HIGHWAY PROBLEMS. THIS INTEREST WAS GENERATED BECAUSE MODERN MAN-MADE PIEZOELECTRIC CERAMIC MATERIALS EXHIBIT THE PROPERTY OF GENERATING AN ELECTRICAL SIGNAL OF CONSIDERABLE MAGNITUDE WHEN MECHANICAL STRESSES ARE APPLIED TO THE CRYSTAL. UPON COMPLETION OF THE FUNDAMENTAL STUDY IT WAS EVIDENT THAT PIEZOELECTRIC CERAMIC TRANSDUCERS COULD BE USED TO MEASURE MECHANICAL FORCES IN VARIOUS APPLICATIONS TO HIGHWAY PROBLEMS. THE CHOICE WAS MADE TO DEVELOP EQUIPMENT FOR THE MEASUREMENT OF VEHICULAR TRAFFIC ON RIGID HIGHWAYS. A UNIT WAS DESIGNED AND CONSTRUCTED TO MEASURE TRAFFIC DENSITY. THIS UNIT IS REFERRED TO AS PROTOTYPE I. A SECOND UNIT, PROTOTYPE II WAS DEVELOPED TO WEIGH EACH INDIVIDUAL AXLE OF A PASSING VEHICLE AND SUMMARIZE THESE SIGNALS FOR THE TOTAL WEIGHT OF THE VEHICLE. PROTOTYPE I HAS BEEN COMPLETED AND LABORATORY AND LIMITED FIELD TESTS HAVE BEEN CONDUCTED. PROTOTYPE II HAS BEEN BUILT BUT NO TESTS HAVE BEEN CONDUCTED.]]></description>
      <pubDate>Tue, 07 May 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/117297</guid>
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