It's not the stopping distance that's a problem in causing a tailgater
rear-end collision.  It's reaction time, and lack of being able to
anticipate a sudden issue.  That's why tail-gating is illegal, even if you
attempt to explain to the officer (and the judge) that you were just 'NASCAR
drafting' in an ill-concieved attempt to improve gas mileage.
  Plus, if the tractor-trailer hits an immoveable object (like a bridge
abutment, or a large vehicle pulling out in front of it, normal braking
stopping distances are irrelevant.
  Come on, people!  Where's the common sense in all this?  An intelligent
person wouldn't dream of partaking in such a risky and stupid act.  You have
too much to lose.

Mike B.

> 3.) If you are paying attention, you will not end up as a rear bumper
> ornament on a semi. Stopping distance for a 40,000 lb truck is a bit
> longer than a 4,000 lb van.