The Traffic Accident Reconstruction Origin -ARnews-

Re: Speedometer Locked in Position Following a Collision

Tim Schewe (timothy.schewe@rcmp-grc.gc.ca)
Wed, 11 Mar 1998 23:43:15 -0500 (EST)

For what it's worth, in my short experience, I have only had two instances of a
trapped speedometer needle. One was trapped at 90 km/h and I was able to
calculate a yaw speed of about 130 km/h. The other was trapped at about 65 km/h
but I was unable to do a speed workup.

I understand that Transport Canada is able to detect needle slap from indentation
on the meter face following a collision based on techniques developed during
airplane crash investigations. Perhaps the NATSB could be of some help to you
if it were important enough?

Tim.
Tim Schewe
timothy.schewe@rcmp-grc.gc.ca

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