THE trailer of a B-double milk truck caught fire during its journey along Dimboola Road in Horsham on Monday.
Horsham police Sergeant Chris Van Buuren said the trailer disconnected from the truck about 6.40pm and caught fire to the grass on the side of the road.
The truck was travelling west at the time.
Sergeant Van Buuren said the highway was closed until 1am on Tuesday as emergency services responded.
The driver, 65, was not injured.