A guy driving caught a runaway truck on his dashcam passing him in the next lane of a mountain road. So he passes it, stops, and waits for it to pass him again. Then, in a heroic move, he jumps out of his vehicle, runs alongside the moving truck, jumps in, and hits the brakes to stop it. Looks like something a stuntman would do in a movie.
Apparently, the original driver of the truck had pulled over to the side of the road to check something underneath and the truck rolled over him and started coasting downhill. He apparently suffered fractures, but he's still with us.