Emergency services have been called to a serious crash on the New England Highway south of Muswellbrook.
A vehicle overturned near the intersection of Hebden Road at Ravensworth just before 5.00am on Thursday, blocking the highway in both directions.
A 20-year-old man has been released from the vehicle - he's suffered a deep head wound and a suspected broken right arm.
It's understood the Hunter's Westpac Rescue Helicopter has also been called to the scene.
