I didn't see any signage (and wouldn't have been able to read it anyway) bug based on pavement markings the right land was an "exit only" lane, and the truck driver violated the rules of the road by merging back left over barrier stripes. He was clearly in the wrong, and if caught in the US would not only have been civilly liable (or the truck owner), but on a single conviction of that violation could have faced a suspension or loss of his CDL.

I don't blame the road design or the rider. Exit only lanes, or added lanes forward of an exit ramp are SOP, and the rider had cleared the approach and was past the exit and back in the right lane of the roadway when the truck essentially passed on the shoulder.