Firefighters worked through the night to control the blaze after the truck caught fire at about 7pm on Monday. In a statement, the Hume Police District said the driver noticed a fire within the prime mover after experiencing a mechanical issue. Attempts to extinguish the blaze with an onboard fire extinguisher were unsuccessful, and the fire spread throughout the vehicle combination. Police said initial inquiries indicate the fire was caused by a mechanical failure and there are no suspicious circumstances.
Traffic is being diverted via Yass Valley Way and the Barton Highway while crews clear the site and recover the destroyed vehicle and trailers.
The incident is the latest in a troubling pattern of truck fires on the Hume Highway. In late June, six semi-trailers were destroyed after two trucks collided and crashed into a rest area at Breadalbane, south-west of Goulburn. Police described it as a "miracle" that no one was seriously injured, despite the highly flammable contents causing multiple explosions. A 28-year-old driver was later charged with negligent driving.
On July 17, near Breadalbane, a man died after a road train carrying aerosols collided with his B-double. Both trucks were destroyed by the fire.
Just one week before Monday's blaze, a 34-year-old man was treated for serious burns after his truck crashed into bushland off the Hume Highway near Berrima, sparking another fire.
Authorities have not indicated any link between the incidents, but the cluster of fires along the same highway section has raised concerns about vehicle safety and fire risks on one of Australia's busiest freight routes.