That would be Louisiana. Trust me in my line of work I pull more Tx drivers over then anybody else. Good forbid they actually look at the traffic signs and follow them. That's not to say that LA drivers are good, but from my experience I pull more TX drivers over then I do any other state
I would think the Casinos would have something to do with that, or maybe because I-10 is a major transit route to places like Florida. If we are talking about I-10, Interstates themselves are used for travel, so it is not unusual to have a significant amount of out of state vehicles on them. Also one must keep in mind, the locals know you are there, so they drive accordingly.
I travel to Alabama a lot since I am from there and I can safely say from experience, the folks in Louisiana do not drive any better than the folks in Texas. I always hear how one state or city drivers are worse than others. I have driven in 49 of the 50 states and most every major city, most all of them on a motorcycle, and I can safely say they are all about the same.
At least that is my take on it.
Fred