We were taught that if you follow someone for a mile (not on the hwy but in town) and can't find some violation of the Transportation Code then you are either ignorant of the code or just not observant.Texas traffic laws are the same way. If an officer wants to pull over a car, it only would take a couple minutes before the officer would observe some sort of infraction and the lights can come on.
We once had a DPS trooper share with us some nuances of the code and how it was written so that just about no one could ever obey it all the time. He was the primary TC instructor for DPS and said that there was no one in Texas that he couldn't follow for a short distance and then legally pull over for violating one of the traffic laws.
The bottom line - the TC gives plenty of PC opportunities to stop just about anyone driving in Texas. Now, what you "can do" and what you "should do" are two different matters.