RINGGOLD, Georgia — A massive pileup on Interstate 75 involving more than 120 cars and trucks claimed the lives of four people and created havoc for drivers in the area.

Heavy fog is to blame for the chain reaction crash, that occurred when visibility was reduced to a car’s length.

A propane truck was among the vehicles involved, but fortunately it didn’t leak despite being badly damaged.

“I was driving north on 75 when we hit this patch of fog and everyone just stopped,” says one survivor. “I heard the sound of the car, but I couldn’t see it.”

“Cars were piled around each other,” said another driver involved in the accident. “It’s like peeling an onion. You have to take it apart to get to the center.”

Both sides of the Interstate were involved in the accident, which shut the highway down for numerous hours.