so he was overtaking on the inside (which i believe is illegal isn't it?) because he was to impatient to wait for the truck to get past the slower vehicle in the left lane. truck looked to be going up a slight incline which may have slowed him a touch, but it was obviously going faster then the vehicle in the left lane towing the box trailer, so IMHO the truck driver was doing nothing wrong. obviously we don't know what happened before that as far as the truck being in the right lane for how long? but with the video footage shown, looks like an impatient person who's learnt a lesson there