A vehicle towing a caravan has collided with a bus on a busy Victorian road.

Around a dozen firefighters were called to the crash, which happened on the Geelong Ring Road this morning.

A spokesperson from Fire Rescue Victoria said no one had been seriously injured in the accident.

All southbound lanes of the ring road were closed for several hours.

“All occupants of the vehicles had exited the vehicles and were not trapped,” the spokesperson said. “One patient was treated on scene by Ambulance Victoria paramedics and no further injuries were reported.”