A truck fire on the Hume Highway at Jerrawa, in the early hours of Wednesday morning, is the fourth truck fire to take place on the highway, near Yass, since November.
Firefighters from the Oolong, Gunning and Manton Rural Fire Brigades and Fire and Rescue NSW Station 511 Yass were called to the scene, located on the northbound lane of the highway, opposite the Mundoonan Southbound Rest Area, around 3.30am.
The trailer, carrying frozen goods, was completely destroyed by the fire, which also burnt a section of grass on the side of the highway.
There were no injuries reported and the driver was able to remove the trailer from the prime mover/main cabin.
Firefighters said a neighbouring property owner was kind enough to assist them by providing water for the fire on more than one occasion.
"Whoever he or she is, we thank them very much," NSW Rural Fire Service operational officer for the Southern Tablelands zone, Daniel Osborne, said.
"It really did help our firefighters, who otherwise would have needed additional brigades to cart water up and down the highway."
The Gunning and Oolong Rural Fire Brigades remain on scene to put of the smouldering trailer.
However, the fire is contained and police say they are not treating it as suspicious.
The northbound section of the highway is down to one lane and police believe the other lane will remain closed until around 1-2pm today, while crews clean-up and remove the heavy vehicle and debris.