When I first moved to the 'Lonestar State', after crossing two-thirds of the country with no hassle, I was pulled over by a state trooper because he was issuing a citation to a motorist on the shoulder of Interstate 20 at 7:43 in the morning, and I had failed to make a lane change.
I don't even think he finished writing the original citation to the person already subdued by his presence. He jumped in "Adam-12", and strobe lighted my OUT OF STATE LICENSE PLATE for about a mile and a half, until I realized in disbelief that I was being called out!
Now I drive somewhere between Mr. Magoo and Mr. Ed, so I ruled out speed immediately, and was bewildered to hear I about a rarely enforced infraction, that forces me to vacate the lane. Most of the other 49 states, include "if safe to do so".