A truck driver has died and three other people have been seriously injured in a horror crash at Marulan.
The accident occurred northbound on the Hume Highway around 2.10pm.
Police said initial investigations suggest a truck and sedan collided, with the truck veering off the road and into a tree.
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Tragically, the driver died at the scene, while the passenger was airlifted to hospital with serious injuries.
The driver and passenger of the sedan also suffered serious injuries in the crash and were flown to hospital.
Investigations into the accident are ongoing.