Crystal Miller killed when her car leaves roadway and crashes into tree.

Troopers have identified the woman killed in a crash on Interstate 40 in Davie County early Tuesday morning.

Crystal Miller, 38, of Cleveland in Rowan County, died in the crash around 5:30 a.m. on the westbound side near mile marker 165 west of Mocksville.

Miller's vehicle drove off the road and ran into a tree, troopers said. She died at the scene.

Miller wasn't wearing a seat belt, troopers said. The seat belt might have saved her life, troopers said.

The crash is still being investigated.