Originally Posted by AnitaAnne
That would be passing on the right, which is a violation of the law.
I don't see how it could be passing on the right. As I said, I'm only going by the picture, but it looks as though the (very long!) truck & horse trailer were pulling out of a side road or driveway on the right and turning towards the camera, crossing the lane in which the SUV was travelling. The SUV driver didn't see* it in time to slow or stop, swerved, and hit the end of the trailer. If the trailer had been shorter, it likely would have been out and on its side of the highway before the SUV got there, so no collision. Worst case, the SUV's last-second skid would have taken it onto the shoulder, and maybe off into the ditch.
*Or, not paying attention to driving, unthinkingly assumed that the vehicle pulling out of the side road was just a pickup. People tend to see what they expect. And vice versa: if you forget for a second that you're pulling a very long trailer, you might be tempted to pull out onto the highway when you see that you'd have time enough to get out with just the pickup.