The accident happened about 5 miles east of Strawberry reservoir.
Utah High Patrol authorities say each driver was traveling westbound. One driver was in the fast lane. The other driver was in the slow lane.
The driver traveling in the fast lane got distracted, drifted into the other lane and crashed into the back of the other semi trailer, according to a Utah Highway Patrol spokesperson.
The truck that got rear ended was hauling nearly 4,000 gallons of crude oil, according to driver Steve Case. The collision immediately sparked a fire and shut down traffic in a 20 mile perimeter. Flames burned one truck to the ground. The other was partially damaged.
Case said he was lucky to get out alive.
"All of a sudden, it just engulfed in flames," Case said. "It was really hot and tires were exploding. It was scary."
A hazardous materials team said the crude oil that spilled did not cause any danger to the surrounding area. The cold temperatures froze the oil on the side of the road, according to clean-up crew member, Kody Stauffer.
"There was such a heavy fire from the rear end collision, I'd say it is one of the worst I've ever seen," Stauffer said.
Authorities said they cited the driver who caused the accident for reckless driving.