Discription of Events: I was on the I-215 W when all of a sudden I saw a white car speeding up to my car, shifting in and out of lanes behind me on the busy highway. The car was tailgating me for at least 45 seconds. Then I saw it swiftly go to the left and the car was very close to me on the lane I was driving as if they wanted to run me off the freeway. I was so terrified, I thought they were trying to kill me. Then they rolled down the window shouting obscenity to me. They really were after me for some reason. Shortly they sped up and swiftly got in front of me and drove off.