This is absolutely incredible footage and a stark reminder to stay alert out on the roads. Hard to say what happened here exactly. Clearly the pick up pulls out when he shouldn't have, but the person cruising along doesn't appear to be paying attention either.
Again, I'm using this as a reminder of how quickly things can go wrong behind a big ole piece of metal.
***Warning: I can't make out any "bad words", but someone else watching this thought maybe there was one. I still think it's worth watching, even if there is a naughty word, but wanted to give a heads up.