Should you doze off while your driving,you have to know you have expensive equipment your operating,as well as a customers freight they are expecting to receive.
You may take out a personal vehicle our more in some cases.
People who have families who depend on them to be around for them.
There is also the emergency responders that put their lives on the line on busy highways to secure the scene.
Then there is always the clean. up.
Hulu - Speed X: WRECKED: Destroyed Cab

Watch this training video which is clamming that 2 out of 10 drivers are driving tired.
As well as falsifying their logs.
Police Await Toxicology Reports In Wreck That Killed Family - Jackson News Story - WAPT Jackson

My first Chauffeur License was from Florida in 1966.

This is as bad, or worse, than any wreck I've come up on, or seen pictures of, from Monteagle, TN.

How the Driver lived, is a mystery, to me. The Good Lord was with him is my only answer.

You Got the Double HH (Highway Hog)

My first "white smoke" and hairy ride was down Moneagle in about 1957.
Old IH L190 gas, 5th OD, 32 foot flatbed with 32,500 of bale cotton on.
Sailed off it with a buddy in front, navigated around the "slow" (sane) traffic, made the bottom. Ran the slack adjusters up all the way up and eased on over to NC cotton mills.
Got a FULL reline when back in shop. Good experience for a young driver.
But good they cannot repeat it now on the new lanes.

On my second trip over Monteagle, the Show Mechanic shown me how to adjust slack adjusters until the shoes, they just touched when you spun the tires, and how to find a cracked brakedrum. His name was Karel Fisher, really old guy to me back then, but did he know his stuff.

Remember that old switchback we called the "Horseshoe"?

Yeah, crooked curve.....
We crawled up under, tugged on the arm. (Bull racks had to be empty)
Tightened up till could not move it, then backed off a half turn.
Some had "flippers" cotter keyed on, some had just a 9/16 bolt had.
I don't remember which was first, then changed.
Either way, a driver kept good brakes himself back then.