Severity Index

We aim to describe the risk of head injury in a crash by a number.

The first model used was the Severity Index (SI).

It was calculated using

math image

where

T is the duration of the deceleration during the crash

and

a(t) is the deceleration at time t.

The index 2.5 was chosen for the head and other indices were used for other parts of the body.




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