ENGINEERING-ECONOMIC SYSTEMS ANALYSIS FOR TRANSPORT PLANNING IN DAHOMEY, WEST AFRICA

METHODOLOGICAL ADVANCES ACHIEVED BY THE DAHOMEY LAND TRANSPORT STUDY ARE REPORTED WHICH WERE RECENTLY CARRIED OUT BY A CANADIAN GROUP UNDER THE AUSPICES OF THE UNITED NATIONS DEVELOPMENT PROGRAM AND THE WORLD BANK. THE STUDY EMPLOYED AN ENGINEERING-ECONOMIC SYSTEMS ANALYSIS AIMED AT THE ACCOMPLISHMENT OF DESIRABLE FUTURE TRANSPORT TASKS AT MINIMUM TRUE COSTS TO SOCIETY. THERE WAS FULL INTEGRATION BETWEEN TRANSPORT PLANNING PER SE, AND SOCIOECONOMIC DEVELOPMENTS, ESPECIALLY IN THE CRUCIAL AGRICULTURAL SECTOR, TO THE TARGET YEAR 1990. GIVEN POPULATION ESTIMATES, PRODUCTION AND CONSUMPTION QUANTITIES, BOTH PRESENT AND FUTURE, FOR EACH NODE, THE 'TRANS' MODEL CALCULATED INDIVIDUAL COMMODITY SURPLUSES AND DEFICIENCIES THROUGHOUT THE COUNTRY. IT THEN SIMULATED FREIGHT AND PASSENGER MOVEMENTS THROUGH THE LAND TRANSPORT NETWORK BY APPLYING A 'MINIMUM COST PATH' CRITERION. THESE CALCULATED TRAFFIC FLOWS FOR THE CURRENT YEAR WERE THEN COMPARED WITH ACTUAL MOVEMENTS, OBTAINED THROUGH O-D STUDIES AND COUNTS, AND THE TRANS MODEL CALIBRATED. THE TRANS MODEL OUTPUT, LINK INVENTORY INFORMATION, AND NEW PROPOSAL COAST WERE ALL FED INTO THE 'OPT' MODEL. ITS CHIEF PURPOSE WAS TO CONFRONT VARIOUS TRAFFIC LOADS GENERATED BY THE TRANS MODEL WITH DIFFERENT TECHNICAL NETWORK DESIGNS. IT SELECTED FROM THOSE THE ONE COMBINATION THAT PROMISED TO HANDLE THE TOTAL LOGISTICS TASK AT MINIMUM TOTAL COSTS, THE COST STREAMS BEING DISCOUNTED AT RELEVANT TRIAL INTEREST RATES OVER THE PLANNING PERIOD 1969 TO 1990. INHERENT IN THE OPT MODEL WERE ECONOMIC-TECHNICAL INTERACTIONS BETWEEN VEHICLE AND ROAD, AS ANALYZED BY ROBLEY WINFREY AND JAN DE WEILLE; TAX CONTENT AND FOREIGN EXCHANGE ADJUSTMENTS; AND CONVERGENT ITERATIVE TRAFFIC ASSIGNMENT VERSUS NETWORK DESIGN CALCULATIONS. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 33-46
  • Monograph Title: Transportation economics
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00201715
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Nov 24 1994 12:00AM