Investigators in Limestone County are working hard to determine the cause of an overnight accident.
It happened around 2:45 this morning along Highway 20 in Limestone County between the river bridge and interstate bridge.
Investigators say a red van was traveling east bound on 20 when the driver ran off the road, flipping several times.
The driver was thrown from his van and landed in the middle of the 4-lane highway.
He was taken to Decatur General by ambulance, but was then flown by Medflight to Huntsville Hospital with life threatening conditions.
Decatur police are investigating, no name has been released.