About 60 firefighters are on the scene of a grass fire burning east of Corowa, which has spread to about 50 hectares.
NSW Rural Fire Service district officer Paul Muir said there was no threat to property and fire crews were in the process of containing the fire on Wednesday afternoon.
He said a car travelling on the Riverina Highway pulled over when a fire started in the vehicle and with “the heat and a bit of breeze”, it spread into the nearby grass.
A three to four-kilometre section of the Riverina Highway and Hopefield Road was closed to traffic, but has since reopened.
The 20 RFS trucks and a council grader were working at the scene.
Emergency services have warned people to avoid the area if possible and expect delays along both roads.