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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>COPING WITH MAJOR SNOW STORES IN URBAN AREAS-COMMUNICATIONS</title>
      <link>https://trid.trb.org/View/107200</link>
      <description><![CDATA[A CENTRAL COMMUNICATIONS NETWORK IS INDISPENSABLE IN A SNOW AND ICE CONTROL ORGANIZATION. THIS IS PARTICULARLY TRUE OF THE LARGER MUNICIPALITIES IN THE MODERATE TO HEAVY SNOW-BELT SECTIONS OF THE COUNTRY. IN NEW YORK CITY, LOCAL SNOW SITUATIONS ARE FOUND TO BE AT SUCH VARIANCE THAT TRUCK-PLOWS WERE NEEDED TO OPEN ROADWAYS IN ONE PART OF THE CITY WHILE NOT A SINGLE SNOWFLAKE FELL IN ANOTHER PART. IT IS ABSOLUTLEY IMPERATIVE, THEREFORE, FOR THE SANITATION DEPARTMENT TO SECURE TIMELY INFORMATION AND PROGRESS REPORTS OF WEATHER FORECASTS AND TO SECURE DIRECT REPORTS FROM VARIOUS SCENES OF ACTUAL OPERATIONS. THE DEPARTMENT RELIES PRIMARILY UPON THE TELEPHONE FOR LIAISON WITH THE UNITED STATES WEATHER BUREAU AND OTHER FORECASTING SERVICES. IT HAS ESTABLISHED A DIRECT LINE OF TELETYPE COMMUNICATION WITH PRIVATE WEATHER FORECASTING SERVICES. THE TELETYPE SYSTEM OF OVER 70 INTERNALLY FIXED POSITIONS THROUGHOUT THE DEPARTMENT IS THE BASIS FOR DOCUMENTING CLEAR, CONCISE ORDERS TO THE WORKING FORCES IN THE FIELD. IN THE PAST SEVERAL YEARS COMMUNICATIONS FACILITIES HAVE BEEN EXPANDED TO INCLUDE A TWO-WAY RADIO SYSTEM CONSISTING OF NEARLY 140 UNITS. A SHORTCOMING OF THE RADIO NETWORK LIES IN THE SHYNESS OF THE PEOPLE WHO USE IT. ANOTHER MAJOR SHORTCOMING IS THE LACK OF RADIOS IN OPERATIONAL VEHICLES. /AUTHOR/]]></description>
      <pubDate>Tue, 23 Aug 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/107200</guid>
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      <title>THE SHORT LIFE OF A HOLE IN THE STREET</title>
      <link>https://trid.trb.org/View/107231</link>
      <description><![CDATA[CHICAGO'S NEW STREET MAINTENANCE SYSTEM USES AN IBM CARD, A TELETYPE SYSTEM, A TWO-WAY-RADIO COMMUNICATIONS NET AND SOME SPECIAL FORMS TO CODE WORK PERFORMED FOR DATA PROCESSING. THE SYSTEM IS DESCRIBED THAT PROVIDES ONE DAY MAINTENANCE SERVICE ON STREET REPAIRS AND KEEPS CLOSE TABS ON MAINTENANCE COSTS. THE PUNCH CARD RECORDS KEEP TRACK OF EQUIPMENT USAGE ON CITY MAINTENANCE WORK.]]></description>
      <pubDate>Fri, 01 Jul 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/107231</guid>
    </item>
    <item>
      <title>CHANNEL-LOSS DETECTOR FOR LOW-TRAFFIC TELETYPE CIRCUITS</title>
      <link>https://trid.trb.org/View/28722</link>
      <description><![CDATA[The report describes a prototype device for application at international flight service stations to detect teletype channel loss by providing an idle signal in the absence of messages and activating alarms when continuity is disrupted or a failure occurs which disables teletypewriter communication. Two units, each comprised of send and receive channel-loss detectors and teletypewriter circuit interfaces and associated alarms, were developed and evaluated at the National Aviation Facilities Experimental Center in accordance with Systems Research and Development Service, Washington, requirements and were found to perform satisfactorily. As a digital device, the channel-loss detector may lend itself to other communication applications as needed.]]></description>
      <pubDate>Mon, 18 Oct 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/28722</guid>
    </item>
    <item>
      <title>DIAMOND INTERCHANGE TRAFFIC CONTROL. VOL. 8. USER'S GUIDE FOR COMPUTERIZED TRAFFIC CONTROL PROGRAM</title>
      <link>https://trid.trb.org/View/112783</link>
      <description><![CDATA[THIS REPORT DESCRIBES THE PROCEDURES EMPLOYED BY THE OPERATOR IN USING THE REAL-TIME TRAFFIC CONTROL PROGRAM FOR THE COMPUTERIZED SIGNAL CONTROL SYSTEM WHICH WAS DESIGNED, DEVELOPED, AND IMPLEMENTED AT WESTERN AVENUE INTERCHANGE OF THE SANTA MONICA FREEWAY. THE OPERATOR INTERFACE SECTION DESCRIBES THE COMMANDS THAT CAN BE TRANSMITTED AND MESSAGES THAT CAN BE RECEIVED FROM THE COMPUTERIZED SYSTEM THROUGH THE TELETYPE UNIT LOCATED AT THE CONTROL CENTER. OPERATOR PROCEDURES FOR STARTING UP THE SYSTEM, INITIALIZING, RETURNING THE SYSTEM TO THE LOCAL CONTROL (BACKUP) SYSTEM, AND SYSTEM SHUTDOWN ARE ALSO DESCRIBED. THE PROCEDURES FOR RECORDING OPERATIONAL PERFORMANCE STATISTICS ARE ALSO DESCRIBED.]]></description>
      <pubDate>Fri, 07 May 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/112783</guid>
    </item>
    <item>
      <title>A CENTRALLY-COORDINATED AND REMOTELY CONTROLLED DATA ACQUISITION SYSTEM</title>
      <link>https://trid.trb.org/View/132221</link>
      <description><![CDATA[THE PURPOSE IS TO RECORD AND/OR LOG DATA SIGNALS ORIGINATING AT REMOTE TEST TERMINALS IN THE FAIRBANK HIGHWAY RESEARCH STATION STRUCTURAL LABORATORY. A MAXIMUM OF 21 SIGNALS MAY BE RECORDED ON ANALOG MAGNETIC TAPE. A MOBILE (REMOTE) TEST CONSOLE IS PROVIDED FOR ALTERNATIVE INITIATION AND CONTROL OF DATA ACQUISITION FROM 96 CHANNELS OF QUASI-STATIC STRAIN GAGE BRIDGE TRANSDUCERS AT RATES UP TO 100 SAMPLES PER SECOND. ALTERNATIVELY THESE DATA MAY BE RECORDED ON DIGITAL MAGNETIC TAPE, PUNCHED PAPER TAPE OR LOGGED ON A TELETYPE MACHINE. THE GREATER PORTION OF THE SYSTEM, DESIGNATED AS "DATA CENTRAL" IS LOCATED AT A FIXED POINT IN THE LAB. THE "MOBILE TEST CONSOLE" IS DESIGNED FOR FLEXIBILITY OF TRANSFER AMONG VARIOUS REMOTE TEST SITES IN THE LABORATORY. /FHWA/]]></description>
      <pubDate>Wed, 18 Nov 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/132221</guid>
    </item>
    <item>
      <title>COMMUNICATIONS SYSTEM AND PREVENTATIVE MAINTENANCE PROGRAM</title>
      <link>https://trid.trb.org/View/107729</link>
      <description><![CDATA[THE MAINTENANCE OF COMMUNICATIONS SYSTEMS IS UNIQUE IN THAT AT LEAST PART OF IT IS UNDER CONTROL OF THE FEDERAL COMMUNICATIONS COMMISSION (FCC). MUCH OF THE MAINTENANCE CAN BE DONE PREVENTIVELY. THE SYSTEM AND EQUIPMENT ON THE N. J. TURNPIKE CONSISTS OF 13 FIXED MICROWAVE STATIONS WITH A CAPACITY OF 100 CHANNELS PLUS ASSOCIATED RADIO, TELEPHONE, AND TELETYPE SYSTEMS. THE COMMUNICATIONS-SERVICE TECHNICANS GROUP CONSISTS OF 11 MEN. APPROPRIATE RECORDS ARE KEPT FOR EQUIPMENT COGNIZANCE, FOR INVENTORY CONTROL, AND FOR FCC PURPOSES. THE SHOP ITSELF CONTAINS MANY INSTRUMENTS INCLUDING A HIGH-FREQUENCY DIGITAL-READOUT COUNTER FOR A FREQUENCY STANDARD, AND A MODULATION INDICATOR. THE NORMAL AND EMERGENCY OPERATIONS OF THE GROUP ARE DESCRIBED. /BPR/]]></description>
      <pubDate>Wed, 13 May 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/107729</guid>
    </item>
    <item>
      <title>THE GCARS II SYSTEM</title>
      <link>https://trid.trb.org/View/98749</link>
      <description><![CDATA[THE GCARS II SYSTEM REPRESENTS A MORE ADVANCED, EXPERIMENTAL VERSION OF THE GCARS SYSTEM THAT UTILIZES A NEW TELETYPE SUPPORT SYSTEM, TERMED "PROCSY", WHICH IS CURRENTLY BEING DEVELOPED AT PURDUE. THE USE OF THE TELETYPE TERMINALS ALLOWS THE ENGINEER TO FORMULATE HIS REQUEST FOR AN ANALYSIS IN A SIMPLE NATURAL FASHION BY ANSWERING A SERIES OF QUESTIONS PROGRAMMED INTO THE SYSTEM. THIS "INTER-ACTIVE MODE" OF JOB SUBMITTAL ALLOWS AN ENGINEER WITH NO PREVIOUS COMPUTER EXPERIENCE TO LEARN TO USE THE GCARS TECHNIQUES AFTER ONLY TEN MINUTES OF INSTRUCTION. THE GCARS II SYSTEM WAS DEVELOPED FOR USE IN A SHORT COURSE HELD AT PURDUE IN MAY 1969. THE PARTICIPANTS SUCCESSFULLY UTILIZED THE SYSTEM TO REQUEST DESIRED ANALYSES. AT THE PRESENT TIME GCARS II ONLY INCLUDES THE GENERATION OF ALTERNATIVES PHASE OF THE GCARS SYSTEM AND ONLY HANDLES PREPARED DATA FOR TWO TEST AREAS. EXPANSION OF THE SYSTEM COULD EASILY BE ACCOMPLISHED HOWEVER THROUGH THE DEVELOPMENT OF ADDITIONAL PROCSY COMPUTER PROGRAMS. /AUTHOR/]]></description>
      <pubDate>Mon, 09 Mar 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/98749</guid>
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