this vid was posted here a while back and I think the consensus was that the fence didn't fully remove from the posts but, rather, lifted up,
allowing the car to drive under it, then it fell back into place. If you were to push the fence it would, presumably, lift upward like a garage door.
I remember seeing that on TV! I think it's real, but the part where it "Goes straight through the fence" may be fake, as you could only see it from
the corner of the screen.