The crash site has been cleared, but southbound traffic remains heavy.

Earlier: Traffic is heavy on the Hume Motorway at Wilton after a truck accident on Monday morning.

The accident, which occurred just before 7.30am, has closed one of two southbound lanes of the motorway.

Traffic is queued back for 2.5km near the crash site, just past Picton Road.

The guard rail was damaged in the accident.

Emergency services and traffic authorities are on the scene.