Police are appealing for public assistance as they investigate the sexual assault of a woman at a location between Yass and Campbelltown last weekend.

About 10.10pm on Sunday 17 April 2016, a 44-year-old woman drove a white dual-cab utility with Qld registration plates and towing a horse float, to a service station at Yass.

About two hours later, the woman left the service station and continued to drive along the Hume Highway towards Sydney, when she stopped at a rest stop and entered a toilet block.

Police have been told two men pushed the woman to the ground and sexually assaulted her, before fleeing the scene.

The woman drove to her home on the state’s Central Coast, and contacted police.

She suffered cuts and bruises and was treated for her injuries.

Officers attached to Brisbane Water Local Area Command attended and commenced investigating the incident.

It’s believed there may have been two semi-trailers parked at the rest stop at the time of the incident.

The men involved are only described as having Australian accents and smelling of body odour.

As inquiries continue, police are appealing for any witnesses, or anyone with information, to contact Crime Stoppers.