TRAFFIC is in chaos north of the Sydney Harbour bridge after a fatal crash between a truck and a car.

A female passenger, believed to be aged in her 60s, who was travelling in the car died, at the scene, police say.

All city-bound lanes in the Lane Cove Tunnel are closed and traffic is being diverted via Epping Road.

Motorists are strongly advised to avoid the area until further notice.

Police said the car and truck collided at about 3.05pm.

Anyone with information about the collision is asked to contact Crime Stoppers on 1800 333 000.

Originally published as Traffic choked after fatal crash