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Guide for Pavement-Type Selection (2011) / Chapter Skim
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Pages 13-19

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From page 13...
... The LCCA procedure involves establishing the LCCA framework, estimating initial and future costs, computing life-cycle costs, and analyzing/interpreting the results. Figure 8 presents a flow chart of this procedure.
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From page 14...
... Evaluation of life-cycle costs. Estimate direct agency costs Estimate road user costs Historic bid tabulations/ actual costs Compute NPV of agency costs LCCA framework Pavement life-cycle strategies (see Figure 4)
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From page 15...
... User costs are an aggregation of time delay costs, vehicle operating costs, crash costs, environmental costs, and discomfort costs associated either with work zones or any time during normal (nonrestricted) operating conditions.
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From page 16...
... The user costs are not combined with the agency costs but are evaluated separately using the process discussed in Chapter 5. In deterministic analysis, computing life-cycle costs involves a simple application of NPV.
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From page 17...
... 4.5.1 Analysis of Deterministic Life-Cycle Cost Results In the analysis of deterministic results, the percent difference in life-cycle costs of alternatives is computed. The costeffectiveness of alternatives is established by comparing the percent difference against some established threshold requirement.
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From page 18...
... This technique uses correlation analysis and tornado plots to show the impacts of key input parameters on life-cycle costs. Inputs found to be driving the LCCA results can be scrutinized to determine if actions can be taken to improve cost-effectiveness.
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From page 19...
... 0.12 -0.20 -0.22 0.25 -0.35 0.60 -1.00 -0.80 -0.60 -0.40 -0.20 0.00 0.20 0.40 0.60 0.80 1.00 Correlation Coefficient Initial Const. Cost Initial Const.
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Key Terms

  • user costs
  • rehabilitation costs
  • initial costs
  • maintenance costs
  • work zone

  • cycle costs
  • costs incurred
  • cost estimates
  • cost estimate
  • pavement types

  • service life
  • user cost
  • pavement type
  • cost initial
  • road user

  • adjustment factor
  • pavement alternatives
  • structural design
  • life estimates
  • survival analysis

  • unit price
  • analysis period
  • agency costs
  • service lives
  • remaining life

  • future costs
  • road users
  • highway administration
  • salvage value
  • type selection


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