The Traffic Accident Reconstruction Origin -ARnews-

Re: ABS adjustment factor

Ed Livesay (EdLivesay@worldnet.att.net)
Wed, 31 Jul 1996 10:21:17 -0400 (EDT)

Jerry: I just finished instructing a course for our State Patrol in which we
carried out experiments with a Ford Crown Victoria... we had pulled the ABS fuse
and also found that the rear tires did not lock up. An identical experiment with
a Chevy Caprice revealed that after pulling the modular connector found just ahead
of the master cyclinder that all four tires did lock up.... (both vehicles were
only a year old)

After conducting perhaps 25-30 skid comparisons against skid sled results I am
finding at least some correlation between the highest (peak) deceleration factor
revealed by a skid sled and the deceleration of an ABS equipped vehicle. This is
also somewhat consistent with the peak values produced by a VC-2000. The static
friction values produced by a drag sled just as it begins to move seem to have
a strong correlation with the actual skid distances/speeds predicted and found
during test skids with ABS vehicles... Perhaps the few inconsistencies do indeed
lie with driver input/pedal pressures etc.
Ed Livesay
EdLivesay@worldnet.att.net

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