we saw this happen as well. the truck went over in slow motion, actually fairly gracefully. It looks to us like he got cut off. At the least, i'd say that the shipping container was top heavy so that when he went around the corner, over he went. I'd guess it was not his fault. Thankfully, the driver was able to walk away, he looked unhurt when he came out of the cab. Lots of people stopped to lend a hand as well, way to go!!