ML>sounds like both of you experianced wheelspin when the drive wheels lost
  >traction... the speedometer cable was connected to something that was also
  >attached to the drive wheels and thus the speedometer measured and displayed
  >the speed that the drive tires were spinning during the loss of traction... 
  >all likely happened so fast, that you didn't even had any real time to remov
  >your foot from the gas pedal...

Imagine if the car became airborne just before
impact...  as in, for instance, crossing a short
ditch...

Ken

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