If you look at the video from 00:17 you'll see the shadow of the bus in front of the speeding idiot, which had just changed into that lane. Watch carefully - there's a truck in the right hand lane as well, the bus is hit and its tail is pushed sideways into the truck in the next lane but the bus is propelled forward and the truck also moves forward when the gas cylinder truck stops. It looks like the idiot driver escapes at 26 seconds. He ran out in the open too - what a pity someone didn't pull out an M82A3 and drop the idiot.
After closely reviewing the video in high resolution (I downloaded it) I'm fairly sure the debris at 2:52 looks like a gas tank that's ripped itself open mostly along its seam. Vehicles are left hand drive (look at the black car at 00:21, and motorway entry from the right), so it's unlikely the debris could have been the driver. What a farkin pity.