The Highway Design and Maintenance Standarts Model

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The Highway Design and Maintenance Standarts Model

• INS. YÜK. MÜH. VEYSEL ARLI

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• The Highway and Maintenance Standarts Model (HDM)
  is a versatile tool for studying the economic
  viability of alternative road improvement and
  maintenance strategies.
• HDM uses emprical relationships for estimating
  pavement performance and vehicle operating costs.
• HDM can be used at both the network and the
  project level.
• HDM is well suited to the study of economic
  benefits of strengthening pavement, making
  relatively minor geometric improvement and
  providing a smoother riding surface.

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• Construction, maintenance and road user costs are
  added together over time and discounted to
  present values.
• The HDM model is used to make comparative cost
  estimates and economic evaluations of various
  policy options.
• The user can search for the alternative with the
  lowest discounted total cost or request
  comparions in terms of rate of return, net
  present value, or first year benefit.
• Also, user can find the set of design and
  maintenance option that would minimize total
  discounted transport costs or maximize net
  present value of an entire highway system under
  multiple year budget constraints.

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Calibration of the Models

• Certain general relationships, such as those
  regarding behavior of materials, operation of
  vehicles, and the effect of surface roughness on
  vehicle operating speeds and costs, can be
  applied in different countries of similar
  climates.
• However, a degree of calibration will almost
  always be required for some parametres of the
  model to simulate reasonably well the conditions
  in a particular country.