Perpetrator was entering Florida's Turnpike and proceeded to change lanes. The turnpike has 4 lanes and the perpetrator decided to recklessly, and without looking, move all the way to the 2nd lane from left where I was driving. They would have hit me if I hadn't reacted and swerved to the left. Probably ashamed of themselves, they sped off more than 20mph above the speed limit. Looking back at the dashcam footage, they cut off two other cars in the lanes next to me.