Around 1.05pm Monday, emergency services were called to a section of the Pacific Highway at Cooperabung after a Mazda van and a truck collided head-on.

The man driving the Mazda, the sole occupant of the vehicle, was pronounced dead upon the arrival of emergency services.

The man driving the truck was uninjured but was taken to hospital for mandatory blood and urine testing. He was the only person travelling in that vehicle at the time of the crash.

Initial inquiries indicate the southbound Mazda crossed into the northbound lanes where it collided with the truck.

The northbound lanes are currently closed, with a contraflow in place.

Motorists are advised to check livetraffic.com for the latest updates.

Monday, 3pm: Southbound light vehicles are now diverting away from the Pacific Highway in Cooperabung due to a serious car and truck accident at Cooperabung Close where one person is trapped.

These vehicles are being diverted onto Cooperabung Drive.

Alternating traffic control remains in place for all northbound vehicles and southbound heavy vehicles, but the stop/slow is favouring northbound. 

Traffic in both directions is very heavy, especially northbound. Northbound traffic is queued back more than four kilometres and southbound traffic is queued back more than one kilometre. 

Both northbound and southbound motorists are advised to allow plenty of extra travel time and expect delays. 

Emergency services and traffic crews are still on site, but due to the nature of the accident, these traffic conditions are expected to remain in place for some time. 

Monday, 1.25pm: Motorists travelling on the Pacific Highway in Cooperabung, between Port Macquarie and Kempsey, are experiencing significant delays due to a serious car and truck accident. 

One person is trapped in the car. All emergency services have been deployed to the accident site.

Only one lane is open at Cooperabung Close and motorists are taking it in turns to use that lane under alternating (stop/slow) traffic control.

Traffic is very heavy, especially northbound, which is queued back four kilometres. Southbound traffic is queued back one kilometre. 

Motorists are advised to allow plenty of extra time and exercise caution. 

Emergency services are working to clear the site, however due to the nature of the accident, there is no forecast for when all lanes will open again.