Draft regulation Impact Statement for Underrun Protection a draft statement inviting discussion and comments from parties affected by the proposed heavy commercial vehicle safety initiative January 2007 Report Documentation Page

Note: this method was used to provide a sensitivity comparison to the method above.

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  For a given year, calculate the proportion of vehicles in the fleet fitted with devices, assuming they are only fitted to new vehicles (the figures only apply to rigid or articulated trucks).
  
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  For a given year, multiply the overall cost of installing devices with the calculated proportion of the fleet. Adjust the cost using Present Values.
  
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  For a given year, multiply the possible overall benefit from installing devices with the calculated proportion of the fleet. Adjust the benefit using Present Values.
  
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  For a given year, calculate the cumulative Net Present Values of the benefits and costs.
  
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  For a given year calculate the cumulative Benefit-Cost Ratio.