USER BENEFITS IN ECONOMIC ANALYSIS OF METROPOLITAN FREEWAY CONSTRUCTION

AN EXTENSIVE TWO-PHASE STUDY OF HIGHWAY USER BENEFITS RESULTING FROM THE OPERATION OF THE SEATTLE FREEWAY IS ANALYZED FOR THE PURPOSE OF SIMPLIFYING THE DATA REQUIREMENTS AND THE METHODS OF CALCULATION. RESULTS OF THE DETAILED STUDY OF BENEFITS INDICATE THAT TRAVEL TIME SAVINGS AND ACCIDENT REDUCTION BENEFITS ARE THE PRINCIPAL COMPONENTS OF URBAN HIGHWAY USER BENEFITS. THE BASIC FORM OF THE TRAVEL TIME SAVINGS CALCULATION IS ANALYZED. USE IS MADE OF THE MINIMUM TRAVEL TIME RATIO (MTTR) TO EVALUATE TRAVEL TIME SAVINGS. IT IS HYPOTHESIZED THAT THE RELATIONSHIPS BETWEEN THE MTTR AND HIGHWAY AND TRAFFIC CHARACTERISTICS WILL FACILITATE ITS ESTIMATION. CALCULATIONS USING THESE RATIOS IN CONJUNCTION WITH COARSE TOME-OF-DAY SUBGROUPINGS AND A TRUCK FACTOR, TO ACCOUNT FOR THE DISPROPORTIONATE TRAVEL TIME BENEFITS ENJOYED BY COMMERCIAL VEHICLES, PRODUCE BENEFITS IN SUBSTANTIAL AGREEMENT WITH THE RESULTS OF MULTIVEHICLE ANALYSIS. AN ANALOGOUS METHOD OF ACCIDENT REDUCTION BENEFIT CALCULATION IS PROPOSED. A RELIABLE METHOD OF FREEWAY AND ARTERIAL ACCIDENT COST ESTIMATION IS USED. A SIMPLIFIED PROCEDURE OF BENEFIT CALCULATION IS PRESENTED AND TESTED AGAINST THE RESULTS OF PREVIOUS ANALYSIS. AGREEMENT WITHIN 2 PERCENT IS ACHIEVED. THE SENSITIVITY OF THE CALCULATED TRAVEL TIME AND ACCIDENT REDUCTION BENEFIT TO ERRORS IN THE COMPONENT FACTORS IS EXAMPLES. WITH ONE EXCEPTION, THE RESULTS ARE NOT OVERLY DEPENDENT ON INDIVIDUAL ESTIMATES. THE RESULTS INDICATE THAT A SIMPLIFIED METHOD CAN BE USED TO ESTIMATE FREEWAY BENEFITS IN URBAN AREAS. A MINIMIZATION OF THE DATA REQUIREMENTS FOR ANALYSIS PURPOSES SHOULD FACILITATE FUTURE BENEFIT CALCULATION. SUPPLEMENTARY RESEARCH OF A LIMITED NATURE MAY BE NECESSARY IN THE EXTENSION OF THESE METHODS. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 32-40
  • Monograph Title: Costs and benefits of transportation planning
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00201929
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Nov 9 1970 12:00AM