Emergency services are at the scene of a truck crash on the New England Highway just north of Murrurundi.
A truck ran into the back of another about 1 kilometre north of the town just before 4 o'clock, trapping one of the drivers in the cabin.
He's been freed and taken to hospital with minor injuries.
One of the trucks was carrying paint, with around 80 litres spilt on the road along with about 250 litres of oil and diesel.
A Hazmat unit from Tamworth has been called in to assist with the clean up.
Both northbound lanes of the highway are blocked with police conducting a contra flow past the scene.
UPDATE: The driver of the rear semi-trailer will be charged with offences relating to fatigue breeches.
Police have revealed the man was driving with a suspended licence and his work diary logged a number of critical fatigue breeches which can negatively affect a person's ability to drive.
The man's work diary has been confiscated and he will be charged at a later date.
