SOUTH STRABANE, Pa. -- The driver of a tractor-trailer managed to walk away unharmed after crashing into a 15-foot retaining wall in Washington County early Saturday morning.

Crews on scene said the driver lost control coming around a bend on I-79 South in South Strabane Township at about 4 a.m.

No one was hurt in the crash but heavy damage was done to the left side of the tractor-trailer.

Investigators are working to learn the circumstances of the crash.