SHAPLEIGH —The condition of a teenager who was seriously injured in a one-car crash in Shapleigh on Labor Day has improved dramatically, the York County Sheriff’s office said Tuesday.

The teen, who was not identified, suffered chest and head injuries and was transported from Goodall Hospital in Sanford, before being transferred to Maine Medical Center in Portland.

The one-car crash occurred on Route 11 at about 2 p.m. Monday. The road was wet, and according to witnesses, the vehicle spun out and struck a utility pole. Both occupants had to be extricated from the vehicle.

The driver — also a teenager, and related to the seriously injured passenger — was treated and released.

The crash remains under investigation but no charges are anticipated.