The Traffic Accident Reconstruction
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Re: Injury Potential In Low-Speed Rear-End Crash
Chris Borelli (sdl@ids.net)
Mon, 27 Oct 1997 08:45:26 -0500 (EST)
The problem with a low speed impact analysis is that you have to prove
that the occupants could not be injured. As engineers, the way to do this
is to determine collision severity (delta v) and relate the available
low speed impact research using human volunteers to the injuries allegedly
sustained by the occupants. The problem is that the subject collision
variables have to be identical to the research (seated normally, looking
forward, belted, head restraint in proper position, etc).
There are approx 400 documented low speed rear end collisions at or below
a delta v of 6mph (with the majority at or below 5mph) with no reported
long term injuries. However, I do not feel that there is enough documented
low speed collisions which had the occupant looking to the side to automatically
say that no occupant could be injured at any delta v. This is not to say that
there is nothing that a reconstructionist can do with someone looking to
the side. But, we must not assume just because we do not think that someone
could be injured in this position and at this delta v, and that several tests
were done without any long term injury, that no occupant could be injured in
a similar collision.
As engineers we must base our conclusions upon some solid facts or a
significant amount of testing. This is why I feel confident in quoting the
400 staged low speed collisions if the variables are similar. Remember, the
most important question in court is not "what is your opinion?", it is "what
is the basis for your opinion?".
Chris Borelli
sdl@ids.net
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