A case study approach was applied to assess the cost implications of design speed standards for rural roads in undulating terrain. The Tasmanian Department of Main Roads (DMR) provided trial designs and construction cost estimates for design speeds ranging from 50 to 90 km/h in each of three test corridors through typical Tasmanian undulating terrain. The results of reported speed studies and a vehicle operating cost simulation model were used to estimate the travel times and fuel consumption for free cars and trucks travelling each of the trial alignments. While decreased travel time appeared as the major road user benefit associated with an increase in design speed, improved grading also gave a reduction in truck fuel consumption. It would appear that, in moderately difficult terrain, traffic volumes of at least 300 veh/day, and probably in excess of 1000 veh/day, are required for road user benefits to offset the additional construction costs associated with an increased design speed (a). The isbn of the microfiche version is 0 86910 146 3. (TRRL)

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    Melbourne, Victoria  Australia 
  • Authors:
    • McLean, J R
  • Publication Date: 1980-10

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  • Accession Number: 00334859
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0 86910 138 2
  • Files: ITRD, TRIS, ATRI
  • Created Date: Oct 28 1981 12:00AM