From Loyal Friend & Reader John C. comes this:

See, what gets up my nose about this is that when Gummint puts up signs, there needs to be clarity above all things.
Take that “requirement” addendum, for instance. Is that a 2-gun minimum per car, or a 2-gun minimum per occupant? This ambiguity certainly leaves the interpretation up to the supervising official, and I’d hate to run afoul of state law just because of the lack of clear signage.
My advice, therefore, is for people to carry at least two guns per person when they visit Texas. Or anywhere else, for that matter.
Or is it a requirement that at least 2 guns are present at the checkpoint at any one time, including in the possession of the people running the checkpoint.