Come on guys - bring a little math into it...

Human reaction times - to detect a problem, decide it's significant, move the foot and apply the brakes - is normally listed as 0.75 to 1.5 seconds. Better if you're Lewis Hamilton, of course. 

At 100 kph, that's 20 to 40 metres.

And your super sticky tyres & brembos haven't yet had a chance to do _anything_ yet - you're still doing 100.

On the other hand, unless the truck ahead of you has driven into a rock face - he's a moving target - so you've got his whole stopping distance to get yourself stopped - before you run up his chuff.

And I'm sorry... but to all the guys saying truck brakes have improved... yes they have, but so have car brakes.

Unless you are driving something like a Mk 1 Cortina, your car can lock up all of its wheels (if you switched off ABS). With the ABS on, it won't lock up all of its wheels - but it will decelerate at the tyre adhesion limit. Assume the same for the truck (big assumption, given the complexities of brake balancing 6-odd axles and 22-odd tyres).

So it comes down to sticky tyres - and few trucking firms are rushing to put Potenzas or Pilot Sports on their rigs.