STUDIES OF NETWORK EVALUATION

RESULTS ARE DOCUMENTED OF 3 SEPARATE BUT INTERRELATED RESEARCH EFFORTS CONDUCTED UNDER THE SAME CONTRACT. A METHOD WAS DEVELOPED FOR EVALUATING ALTERNATIVE NETWORKS, OR PROPOSED CHANGES TO NETWORKS, WITH RESPECT TO THE NET USER BENEFITS OR DISBENEFITS. THE METHOD CAN BE USED BY TRANSPORTATION PLANNERS SINCE IT REQUIRES ONLY THE INTERZONAL TRAVEL VOLUMES, INTERZONAL TRAVEL TIMES, AND THE ESTIMATED CONSTRUCTION COSTS OF THE ALTERNATIVE NETWORKS, OR NETWORK CHANGES. THE METHOD WILL OBTAIN NET USER BENEFITS AND ESTIMATES OF THE OTHER EFFECTS OF THE PROPOSED NETWORK CHANGES, SUCH AS WHICH SOCIAL GROUPS WILL BENEFIT AND WHICH WILL SUFFER FROM A GIVEN NETWORK CHANGE. THE METHOD IS BASED ON BENEFIT AND COST DATA. THE AMOUNT OF VARIATION WHICH COULD BE EXPECTED IN THE CALCULATION OF THE BENEFIT-COST RATIO WAS INVESTIGATED FOR A PROPOSED HIGHWAY INTERCHANGE IN MASSACHUSETTS. IT WAS DETERMINED THE VARIATIONS IN LINK VOLUME ESTIMATES (BENEFITS) PRODUCED THE MOST PRONOUNCED EFFECTS ON THE B/C RATIO, OVERPOWERING THE EFFECTS OF VARIATIONS IN THE CONSTRUCTION AND UNIT-VEHICLE OPERATING COSTS. THE THIRD PHASE OF RESEARCH WAS INTENDED TO INDICATE A PROCEDURE FOR MAKING BETTER ESTIMATES OF PARAMETERS ON THE DEMAND, OR BENEFIT, SIDE OF THE EQUATION. THE DEMAND EVENTUALLY BECOMES THE LINK VOLUME ESTIMATES, FOUND TO HAVE SUCH A GREAT EFFECT ON THE BENEFIT-COST RATIO FOR THE HIGHWAY INTERCHANGE EXAMPLE. ANALYSIS OF DATA FROM 30 CITIES INDICATED A VERY HIGH CORRELATION BETWEEN TRANSPORTATION EXPENDITURE AND INCOME, FOR EACH CITY. USING DATA FROM A SAMPLE OF ALL URBAN FAMILIES, AN EVEN HIGHER CORRELATION WAS INDICATED BETWEEN THE AVERAGE ANNUAL TRANSPORTATION EXPENDITURE AND THE AVERAGE ANNUAL INCOME. TESTED AND PROVEN FALLACIOUS, ON SUBZONAL DATA FROM THE BOSTON REGION, WAS THE HYPOTHESIS THAT DAILY TRIP-MAKING (NUMBER OF TRIPS AND TRIP LENGTH) IS A LINEAR FUNCTION OF THE SOCIO-ECONOMIC STATUS OF THE TRIPMAKER.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Civil Engineering, 77 Massachusetts Avenue
    Cambridge, MA  United States  02139

    Massachusetts Department of Public Works

    100 Nashua Street
    Boston, MA  United States  02114

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Harvey, T N
  • Publication Date: 1967-9

Subject/Index Terms

Filing Info

  • Accession Number: 00200069
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Report/Paper Numbers: State R14-2
  • Files: TRIS
  • Created Date: Apr 12 1994 12:00AM