The Traffic Accident Reconstruction Origin -ARnews-

Re: Tractor Trailer Drag Factor

Mike Wegrzyn (wegrzyn@compworldnet.com)
Tue, 2 Feb 1999 09:03:53 -0500 (EST)

Jim:

I would agree your method for adjusting for grade was correct.
Adjustment for grade would apply to any decelerating object, be it an automobile or 100K truck..acceleration is still at work!

I would submit that adjusting twice (level and then to positive) provides the same result as adjusting once (5 (-2 to +3)). As you used the same vehicle as involved in the accident for your test, I believe you've pretty well removed any potential for argument on the validity of your test (pilot error excluded).

Good luck
Mike
Mike Wegrzyn
wegrzyn@compworldnet.com

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