A WOMAN is in a stable condition in a Brisbane hospital after a four-vehicle crash at Dundathu that a witness described as being "like an atomic bomb going off".

The 21-year-old woman was cut from a black hatchback and flown to the Royal Brisbane Hospital in a critical condition after a four-vehicle crash involving a semitrailer on Maryborough-Hervey Bay Rd at Dundathu about 8.30am on Tuesday.

Corey Birsham told the Chronicle he was a passenger in a vehicle two cars behind the semitrailer and one of the first on the scene.

"I saw the black car veer right into the semitrailer and it was like an atomic bomb going off," he said.

"The truck's cabin bounced over the car and then pulled right and ended up in the bush."

Maryborough Towing's Chris Sawyer, who was at the accident site, said witnesses told him the black hatchback veered under the semi, which was heading towards Hervey Bay.

The road was closed for more than nine hours forcing traffic to detour through Torbanlea.

The road was reopened at 5.45pm on Tuesday after a major spill of diesel fuel was cleaned from the road surface.

The woman was in a critical but stable condition on Tuesday afternoon.

Maryborough police Sergeant Wayne Tincknell said police were still investigating the crash.

"Early indications would tell us that a vehicle may have crossed onto the incorrect side of the roadway causing the accident," he said.

Sgt Tincknell said the driver of the semitrailer and other vehicles had been "very lucky" to escape uninjured.

"I'd just like to remind people to be careful whilst driving on the roads," he said.

"We've got a long weekend coming up and accidents do happen."



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