Appendix B: Countermeasure Assessment

Appendix B: Countermeasure Assessment

Countermeasures were given a rating based on the confidence that the countermeasure would have been able to:

• Avoid the collision entirely
• Significantly reduce the severity of the collision (i.e reduce the fatality to at least serious injury)

The two aspects were assessed independently of each other and each given a score allowing a combined confidence score to be ascertained (See Table 2).

As both collison avoidance and severity reduction meet the aims of the countermeasure – that is to prevent the fatality – it is suitable to assess both together.

The following likelihood scale was used for countermeasure confidence:

• 0 = Not Applicable
• 1 = Possible
• 2= Likely
• 3 = Almost Certain
• 4= Certain

This resulted in a combined score of between 1 and 8, with higher rankings indicating a higher level of overall confidence that the countermeasure would have been appropriate and effective.