I reviewed the video and clearly shows I am in their line of sight. They cut me off really hard and did not use their signal. However, there was a sign indicating to merge up ahead. Which I believe they saw that sign up ahead before I did and choosing to make that decision right away. However, the way they handled it was not correct and nearly crushed me. Thankfully I was paying attention and kept a safe distance as I always do. If I was a little further up parallel to their trailer, I wouldn't be here writing this message.