Campbell County, VA - Truck drivers certainly know the roads better than most.
They're reacting and giving advice to driving in thick fog, now, the known cause of Sunday's massive 95 car pileup on Interstate 77.
One truck driver likened driving in fog to driving blind.
Truckers drive cross country, day and night, through rain, sleet, snow and hail.
But fog some say can stop even the most seasoned truckers, dead in their tracks.
"You can't see. No matter how bright your lights are, you just can't see past your hood. Sometimes you can't see that far" said truck driver Roy Hardin.
Hardin is talking about navigating through fog.
He's been driving cross country, for decades. And he says there's nothing that'll ruin a trip more than being caught in a dense haze.
"Fog is worse than all of it, fog is the worst. It's like driving blind folded" he said.
"What I'd seen and heard about the wreck on 77, it was so thick you couldn't see" said truck driver George Gregory.
Gregory knows; he drives through plenty of mountainous terrain. He says the higher elevations are plagued with thick fog.
So thick, "so tail lights, and lights, is just useless" he said.
Truckers have defenses though.
"Alrite buddy, we'll talk to you later, be careful" said Gregory over the radio.
They can communicate, letting one another know the dangers that lie ahead.
But with cars, they say there's only one solution to guarantee safety.
"Slow down, and if you can't see find a safe part to pull off" said Hardin.
Advice that may have saved lives on interstate 77, "They should've slowed down. And if they'd ran up on something, they'd have had time to stop" said Gregory.
And if you think those high beams will help you see through the fog; they won't. In fact your brights will only make it harder to see.
Leave on your low beams, and be sure to slow it down.