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: Estimated cost of underrun crashes = cost of injuries to persons and costs to other than persons

(includes truck damage and immobility)

7. Calculate the possible overall yearly benefit from installing UP devices to the whole fleet;

• 
  Multiply the yearly injury numbers and types (fatal, serious, minor) by the effectiveness of the UP devices for each effectiveness scenario,
  
• 
  Cascade any reduction in injury down to the next level ie fatal injuries saved become serious injuries, serious injuries saved become minor injuries (note that minor injuries are not cascaded to injury free),
  
• 
  Take the reduced injury numbers away from the original injury numbers to get the net reduction in injuries.
  
• 
  Repeat the process, but include non-injury (non-trauma) costs.
  

The four effectiveness rates for UP devices A, B, C and D above where combined with two benefit levels, Level 0 and Level 1. This gave eight possibilities in all. Level 0 benefit estimates were for trauma (injury reduction) alone while Level 1 benefit estimates included trauma and non-trauma related items such as reduced level of property damage, mobility of the truck after an underrun incident: