I think (as does Jason Hutchinson who mentioned this first) that it's a label for the film crew since it will obviously be some vulnerable part which cannot support the full weight of a person (or some similar reason).
Judging by the unaltered footage and no music + the fact it says B-roll in the title this is some stock footage which got leaked or released to some network in order to create some anticipation for the upcoming movie.
I don't like this footage, if it got leaked shame on the person who did it, we've seen the batmobile in pictures and will see it in future 'REAL' teasers/trailers/clips just wait till it comes out properly.
If it was intentionally released shame on the film studio, this shows they are not putting any effort into creating a hype for the movie and does not read well for the movie (i'm going with the first option).
But yes the lable is purely for crew, it has nothing to do with things "in-universe".
Sorry to spoil it for ya but there's probably nothing more to it.