Texas has always taken a lot of pride in itself and Texans in themselves. Sometimes maintaining a sense of exclusivity while playing up our friendly attitude. Jokes like "Welcome To Texas, Now Go Home" for example.
You've seen them and, being unaware of this law as I was, probably didn't even bat an eyelash. Although, you may have raised an eyebrow. They are blatant about it, almost intentionally trying to draw attention to their flagrant lawlessness.
Texas is known for its unique and often irreverent sense of humor. Texas humor incorporates elements of cowboy culture, southern hospitality, and a lot of sarcasm.