1) it could have been a mechanical failure. (not the drivers fault)
2) the driver could have smoked the brakes causing it to happen. (most likely driver error, from various reasons)
i do believe that the trucking company gets a bill for the clean up.
if the driver is not given a ticket, can’t say if that “clears him” or not
learn the PROPER way to do a pre-trip to discover and get repaired any defects, adjust brakes if you have to..
LEARN how to PROPERLY descend down mountains. gearing, jake/engine brake, speed.