The Driver was tailgating people and weaving in and out of traffic in cypress texas. From there they proceeded to get behind me and stay close enough that I couldn't see the car at all in my mirror from cypress all the way to college station. No matter if I sped up, slowed down or changed lanes they would do the same and stay alarmingly close to me. They even went on the shoulder of the road to pass a car to get behind me again. I have no clue why, I was driving as I normally would from Houston to College Station.