While the effect is the same, the reason big rigs leave gaps is because it takes them much longer to change speed. I can't quite fathom what goes on in the heads of folks who cut off big rigs in traffic... I always leave a gap for a couple of reasons:
- I'm often on a motorbike, and if I don't leave a gap, cars will oftentimes confuse *me* for a gap.
- It's far less stressful to give up that minute or so of driving time to not be constantly worried that somebody might *gasp* get ahead of me
- If I need to change lanes, it's far easier and less invasive to accelerate in my gap to get into a spot in another lane than it is to slow down.