The truck, with a Tamil Nadu registration number, was headed towards Malegaon when the incident occurred after it stopped to play the toll, an official said, adding that short circuit could be the cause behind the fire.
According to the official, the blaze almost gutted the truck, and also spread to the toll plaza.
It was brought under control after fire tenders from nearby locations rushed to the spot.
The incident resulted into traffic snarls on the busy highway for some time, police said.