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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>
    <image>
      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>METHODOLGY OF FEASIBILITY STUDIES FOR PUBLIC TRANSPORT</title>
      <link>https://trid.trb.org/View/130653</link>
      <description><![CDATA[CONTENTS: THE ROLE OF PUBLIC TRANSPORT IN CREATING AND MAINTAINING A GOOD QUALITY OF URBAN ENVIRONMENT, P. J. WALKER. A COMPUTATIONAL PROCESS FOR INVESTIGATING THE EFFECTS OF POSTULATED NEW ROUTES AND FREQUENCIES LEADING TOWARDS AN OPTIMUM USE OF THE FACILITIES, T. J. STAFFORD. A MODEL FOR THE ESTIMATION OF OPERATING COSTS, A. CHANDAN. PUBLIC TRANSPORT NETWORKS AND ASSIGNMENT PROCEDURES, H. J. WOOTTON. MODELS EXPLAINING THE CONSUMERS' CHOICE BETWEEN PUBLIC AND PRIVATE MODES OF TRAVEL WHICH MAY BE USED FOR PREDICTING FUTURE BEHAVIOR, D. A. QUARMBY. A CASE STUDY: RAIL EXPANSION PROJECTS ON MERSEYSIDE, WITH PARTICULAR REFERENCE TO THE PROPOSED OUTER RAIL LOOP, G. R. LEAKE. SOME OBSERVATIONS ON THE COST BENEFIT ANALYSIS OF PUBLIC TRANSPORT SYSTEMS, J. WELSBY.]]></description>
      <pubDate>Thu, 27 Oct 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/130653</guid>
    </item>
    <item>
      <title>URBAN DEVELOPMENT DECISIONS AND FINANCE</title>
      <link>https://trid.trb.org/View/92544</link>
      <description><![CDATA[PAPERS PRESENTED AT THE CONFERENCE WERE AS FOLLOWS: THE STRATEGIC CHOICE APPROACH TO PLANNING, BY WEDGWOOD- OPPENHEIM, F., APPLICATION OF AID TO TOWN CENTRE PROGRAMMING DECISIONS IN ST. ALBANS, BY HUNTER, JM; APPLICATIONS OF THE AIDA METHOD ON TEESSIDE, BY WRIGHT, AB; FINANCIAL MODELLING AND THE USE OF PROSPER IN LOCAL GOVERNMENT, BY LOVELOCK, RM; COST BENEFIT STUDY FOR A PROPOSED CIVIC CENTRE, BY CARTER, R; THE DEVELOPMENT OF A COMMON PROGRAMME BUDGETTING SYSTEM FOR CENTRAL GOVERNMENT AND LOCAL AUTHORITIES IN IRELAND, BY NALLY, D; CORPORATE MANAGEMENT AND STRUCTURE PLANNING, BY CORDLE, PL AND HICKS, FAP; SUMMARY OF MANAGEMENT HARDBOOK, CITY OF COVENTRY, BY HENDER, JD; CORPORATE PLANNING IN THE GREATER LONDON COUNCIL, BY GREY, A; AND A FRENCH EXPERIMENT IN LOCAL GOVERNMENT, BY PLAUD, A.]]></description>
      <pubDate>Fri, 15 Mar 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/92544</guid>
    </item>
    <item>
      <title>CRISTAL - A STRATEGIC MODEL FOR URBAN TRANSPORT PLANNING</title>
      <link>https://trid.trb.org/View/120118</link>
      <description><![CDATA[THE PAPER DESCRIBES THE DEVELOPMENT OF A STRATEGIC URBAN TRANSPORT PLANNING MODEL KNOWN AS CRISTAL.  THE OBJECT OF THE MODEL IS TO ENABLE RAPID COMPARISONS TO BE MADE OF THE TRAFFIC BENEFITS OF ALTERNATIVE TRANSPORT POLICIES OR INVESTMENT PLANS WHEN THESE CAN BE EXPRESSED IN A SUFFICIENTLY GENERALIZED FORM.  THE MODEL DEALS WITH FOUR PASSENGER TRAVEL MODES AND WITH ROAD GOODS VEHICLES AND USES THE CONCEPT OF THE "GENERALISED COST" OF A TRIP, I.E. THE SUM OF TIME AND PASSENGER TRAVEL MODES AND WITH ROAD GOODS VEHICLES AND USES MONEY COSTS.  THE REPRESENTATION OF DEMAND AND MODAL SPLIT PERMITS STRAIGHT FORWARD ECONOMIC EVALUATION.  A DISTINCTIVE FEATURE OF THE MODEL IS THE USE OF A SIMPLIFIED GEOGRAPHICAL REPRESENTATION, IN WHICH THE ACTUAL ROAD AND RAILWAY NETWORKS ARE REPRESENTED BY IDEALISED TRANSPORTATION CORRIDORS OF A SYMMETRIC RING AND RADIAL FORM.  THIS SIMPLIFICATION REDUCES THE DATA HANDLING REQUIREMENTS AND THEREFORE SPEEDS UP THE COMPUTING PROCESS. THE FIRST PART OF THE PAPER DESCRIBES THE LOGICAL AND THEORETICAL STRUCTURE OF THE MODEL.  THE PAPER THEN DESCRIBES HOW THE MODEL HAS BEEN PROGRAMMED AND CALIBRATED TO REPRESENT THE GREATER LONDON AREA.  POSSIBLE APPLICATIONS OF THE MODEL ARE ALSO DISCUSSED.]]></description>
      <pubDate>Fri, 01 Feb 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/120118</guid>
    </item>
    <item>
      <title>A MODEL FOR THE STUDY OF MODAL CHOICE IN INTER-URBAN TRAVEL</title>
      <link>https://trid.trb.org/View/120111</link>
      <description><![CDATA[A MODEL IS DESCRIBED WHICH HAS BEEN DEVELOPED TO PREDICT MARKET SHARES OF TRAFFIC FLOW ON EACH MODE OVER A MULTI-MODAL INTER-CITY NETWORK. THE PRESENT STATUS OF THE WORK IS THAT A MODAL SPLIT MODEL EXISTS WHICH WILL ALLOCATE A GIVEN NUMBER OF PEOPLE TRAVELLING BETWEEN A PAIR OF ZONES TO THE VARIOUS LINKS BETWEEN THE TWO CITIES AND WHICH TAKES SOME GENERATION EFFECTS INTO ACCOUNT. THE MODEL IS GEOGRAPHICALLY SPECIFIC, I.E. IT DOES NOT ATTEMPT TO PREDICT THE FORM OF A CITY WITH ITS DISTRIBUTION OF ORIGINS, DESTINATIONS, AND MAIN MODE TERMINALS, BUT USES DATA FROM REAL CITIES. THE MAIN FEATURE OF THE MODEL IS THAT IT TAKES INTO ACCOUNT THE TERMINAL JOURNEYS BY CONSIDERING THE AVAILABLE ROUTES FROM ORIGIN TO DESTINATION AS BEING A COMBINATION OF ACCESS, MAIN, AND EGRESS MODES. MONEY COSTS, TOGETHER WITH TRAVEL AND WAITING TIME PENALTIES, ARE INCURRED AT EACH STAGE, RESULTING IN AN OVERALL COST AND JOURNEY TIME FOR THE JOURNEY, FURTHER DEVELOPMENT TO ALLOW INTER-MODE INTERCHANGES AND TO FORECAST TOTAL NUMBERS OF JOURNEYS WILL CONTINUE. /TRRL/]]></description>
      <pubDate>Sun, 08 Jul 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/120111</guid>
    </item>
    <item>
      <title>COMMERCIAL VEHICLE TRAFFIC FORECASTING AT THE PORT OF RODDERDAM</title>
      <link>https://trid.trb.org/View/92416</link>
      <description><![CDATA[DESPITE DATA LIMITATIONS, A DETAILED AND SYSTEMATIC STUDY OF FREIGHT MOVEMENTS THROUGH THE PORT WAS FOUND TO BE FEASIBLE. VARIOUS MODELS WERE USED, PROVIDING MUNICIPAL AND PORT AUTHORITIES WITH A PREDICTIVE TOOL FOR PLANNING PURPOSES. FACTORS INFLUENCING FREIGHT MOVEMENT WERE IDENTIFIED, LOCATED GEOGRAPHICALLY, AND RANKED IN ORDER OF INFLUENCE. A LIST OF ASSUMPTIONS MADE IS INCLUDED WITH THE REPORT.]]></description>
      <pubDate>Sun, 20 Aug 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/92416</guid>
    </item>
    <item>
      <title>ADVANCED COMPUTER TECHNIQUES IN ROAD DESIGN</title>
      <link>https://trid.trb.org/View/90631</link>
      <description><![CDATA[THE ADVANTAGES IN USING COMPUTERS FOR HIGHWAY DESIGN ARE CONSIDERED FROM TWO ASPECTS, THAT OF ROUTE SELECTION AND THAT OF FINAL DESIGN. IN THE ROUTE SELECTION STAGE, A WIDER RANGE OF ALTERNATIVES IS POSSIBLE RESULTING IN A BETTER BASIS FOR EVALUATION. THE FINAL DESIGN STAGE CAN BENEFIT BY USING THIS TECHNIQUE, IN THAT A BETTER DESIGN CAN RESULT AT LOWER COST, THE EFFECT OF ADJUSTMENTS CAN BE CONSIDERED QUICKLY, SETTING OUT DATA AND SUPPLIES CAN BE ORGANISED ACCURATELY, A LIMITED STAFF NEED ONLY BE EMPLOYED IF A COMPUTER IS USED ON A BUREAU BASIS. THE COMPUTER PROGRAMS UTILIZED SHOULD BE MADE FLEXIBLE ENOUGH TO FIT ALL CASES; STANDARD VALUES AND PARAMETERS SHOULD NOT THEREFORE BE BUILT IN. A COMPUTER CAN OFTEN POINT OUT SOLUTIONS WHICH MAY NOT HAVE BEEN CONSIDERED, RESULTING IN POSSIBLE SAVINGS IN COST. EXAMPLES OF PROGRAMMING LANGUAGES ARE PRESENTED. /RRL/]]></description>
      <pubDate>Mon, 27 Mar 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/90631</guid>
    </item>
    <item>
      <title>A DYNAMIC PROGRAMMING APPROACH TO OPTIMAL ROUTE LOCATION</title>
      <link>https://trid.trb.org/View/93711</link>
      <description><![CDATA[THIS PAPER OUTLINES THE STRUCTURE OF OPTLOC, A COMPUTER-AIDED SYSTEM FOR THE OPTIMAL LOCATION OF RURAL HIGHWAY LINKS. THE SYSTEM USES A MODIFIED DYNAMIC PROGRAMMING ALGORITHM TO GENERATE ALIGNMENTS AND PROFILES WHICH ARE OPTIMUM IN TERMS OF A DEFINED SET OF CONSTRUCTION, MAINTENANCE AND USER COSTS, AND FEASIBLE WITH REGARD TO SPECIFIED CONSTRAINTS ON GRADES, CURVATURES AND LOCATION. IT IS EMPHASISED THAT THE SYSTEM IS NOT AN ATTEMPT TO PRODUCE FULLY-AUTOMATED SOLUTIONS TO HIGHWAY LOCATION PROBLEMS. /RRL/]]></description>
      <pubDate>Mon, 27 Mar 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/93711</guid>
    </item>
    <item>
      <title>A COMPUTER METHOD FOR DESIGNING THE OPTIMUM VERTICAL PROFILE OF HIGHWAYS</title>
      <link>https://trid.trb.org/View/93712</link>
      <description><![CDATA[THE METHOD DESCRIBED IS A TWO-PART CYCLICAL PROCESS. PART ONE USES A QUADRATIC PROGRAMMING ALGORITHM TO DERIVE AN OPTIMUM SOLUTION FOR SPECIFIC INPUT COST DATA. IN PART TWO THIS SOLUTION IS ANALYSED TO PRODUCE DETAILS OF CUT AND FILL VOLUMES, AN OPTIMAL PROCEDURE FOR CARRYING OUT THE EARTHWORKS, AND REVISED COST DATA FOR INPUT TO PART ONE. IN GENERAL THREE CYCLES HAVE BEEN FOUND NECESSARY FOR CONVERGENCE. /RRL/]]></description>
      <pubDate>Mon, 27 Mar 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/93712</guid>
    </item>
    <item>
      <title>OPTIMUM CURVATURE PRINCIPLE IN HIGHWAY ROUTING</title>
      <link>https://trid.trb.org/View/93713</link>
      <description><![CDATA[THIS ARTICLE CONSIDERS THE PROBLEM OF DETERMINING, FROM AMONGST ALL POSSIBLE ALTERNATIVES, THE OPTIMUM ROUTE TO CONNECT TWO CITIES. THE COMPUTER-BASED OPTIMUM CURVATURE PRINCIPLE (OCP) IS DERIVED FROM THE CALCULUS OF VARIATIONS, AND ITS PRACTICAL APPLICATION TO THE CRITERION FUNCTIONS OF HIGHWAY LOCATIONS IS DISCUSSED. /RRL/]]></description>
      <pubDate>Mon, 27 Mar 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/93713</guid>
    </item>
    <item>
      <title>PROGRAM APPOLON</title>
      <link>https://trid.trb.org/View/93714</link>
      <description><![CDATA[THIS PROGRAM (APPROACH TO THE VERTICAL ALIGNMENT) IS INTENDED TO DETERMINE A REASONABLE SOLUTION FOR THE VERTICAL ALIGNMENT OF A HIGHWAY, WHEN THE HORIZONTAL ALIGNMENT IS FIXED. THE THREE MAIN FUNCTIONS OF THE PROGRAM RESEARCH, SMOOTHING AND EVALUATION, ARE DESCRIBED. /RRL/]]></description>
      <pubDate>Mon, 27 Mar 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/93714</guid>
    </item>
    <item>
      <title>NEW PROCEDURES FOR ROAD PLANNING AND DESIGN</title>
      <link>https://trid.trb.org/View/93715</link>
      <description><![CDATA[THIS PAPER EXAMINES THE COMPUTER-BASED INTEGRATED CIVIL ENGINEERING SYSTEM (UCES) IN TERMS OF ITS APPLICATION TO HIGHWAY DESIGN, GEOMETRY, TRANSPORT NETWORK ANALYSIS, STRUCTURAL ANALYSIS AND DESIGN, BRIDGE DESIGN, SOILS AND POJECT MANAGEMENT. THE PAPER IS PRESENTED IN CHAPTERS AS FOLLOWS: CHAPTER I, INTRODUCTION; II, ROADS (ROADWAY ANALYSIS AND DESIGN SYSTEM), A SUB-SYSTEM OF ICES; III, OPTIONAL ROAD LOCATION THROUGH THE USE OF DYNAMIC PROGRAMMING; IV PROFILE SELECTION; AND V, A STRATEGY FOR PROJECT OPTIMIZATION BASED ON PRODUCTION FUNCTIONS. /RRL/]]></description>
      <pubDate>Mon, 27 Mar 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/93715</guid>
    </item>
    <item>
      <title>PRODUCTION, CONSTRUCTION TIME AND CONSTRUCTION COSTS RELATED TO EARTHMOVING OPERATIONS</title>
      <link>https://trid.trb.org/View/122437</link>
      <description><![CDATA[AN EFFORT WAS MADE TO DETERMINE PRODUCTION CURVES FOR EARTH MOVING EQUIPMENT, I.E. THE PRODUCTION IN CUBIC METERS PER HOUR FOR VARIOUS SOILS AS A FUNCTION OF HAUL DISTANCE AND TO DETERMINE COST CURVES FOR THE SAME EQUIPMENT, REPRESENTING COSTS FOR MOVING ONE CUBIC METER OF VARIOUS SOILS OVER A GIVEN DISTANCE. THESE CURVES SHOULD BE USED AS FOLLOWS: (1) TO EVALUATE THE DIFFERENCE IN EARTHMOVING COSTS FOR ALTERNATIVE LONGITUDINAL PROFILES; (2) TO ESTABLISH THE DURATION OF A GIVEN JOB FOR A GIVEN TYPE OF EQUIPMENT, OR TO ESTIMATE THE EQUIPMENT NECESSARY WHEN CONSTRUCTION TIME IS GIVEN; AND (3) TO ESTIMATE THE TECHNICAL COSTS OF EARTHMOVING AND COMPACTION. /RRL/]]></description>
      <pubDate>Mon, 13 Sep 1971 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/122437</guid>
    </item>
    <item>
      <title>RRL OPTIMIZATION PROGRAMS-FUTURE WORK</title>
      <link>https://trid.trb.org/View/124260</link>
      <description><![CDATA[TESTS HAVE DEMONSTRATED THE JUSTIFICATION FOR FURTHER WORK ON PROGRAMS DEVELOPED AT THE ROAD RESEARCH LABORATORY, CROWTHORNE, BERKSHIRE, FOR THE OPTIMIZATION OF THE VERTICAL HIGHWAY PROFILE, AT THE LOWEST POSSIBLE EARTHWORKS CONSTRUCTION COST. THIS ARTICLE INDICATES THE LINE ALONG WHICH FURTHER RESEARCH WILL BE CONDUCTED, THE IMPROVEMENT OF THE PROGRAMS WITH REGARD TO THEIR SCOPE AND OPERATION, THEIR ADJUSTMENT TO AVAILABLE STORE CAPACITIES, AND THE ELIMINATION OF LOGICAL ERRORS. /RRL/]]></description>
      <pubDate>Mon, 13 Sep 1971 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/124260</guid>
    </item>
    <item>
      <title>A SURVEY OF TRAFFIC CONTROL MODELS</title>
      <link>https://trid.trb.org/View/116625</link>
      <description><![CDATA[A BIBLIOGRAPHY IS PRESENTED ON ANALYTIC AND SIMULATION TRAFFIC CONTROL MODELS. /RRL/]]></description>
      <pubDate>Fri, 19 Mar 1971 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/116625</guid>
    </item>
    <item>
      <title>TRANSYT. TRAFFIC NETWORK STUDY TOOL</title>
      <link>https://trid.trb.org/View/116626</link>
      <description><![CDATA[THE "TRANSYT" COMPUTER PROGRAM IS DESCRIBED FOR DERIVING OPTIMUM FIXED TIME SIGNAL PLANS. THE MAJOR FEATURES OF TRAFFIC FLOW IN A SIGNAL NETWORK ARE REPRESENTED BUT THE METHOD OF CALCULATION IS SUCH THAT THE SOLUTION TIME IS SHORT. A "HILLCLIMB" TYPE OF OPTIMISATION IS USED WHICH GIVES GOOD CONVERGENCY ON THE OPTIMAL SIGNAL SETTINGS./RRL/]]></description>
      <pubDate>Thu, 16 Apr 1970 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/116626</guid>
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