SALEM - Two people sustained serious, non-life threatening injuries Wednesday evening when a car collided with the back of a tractor, which overturned on its side after the crash.

The South Dakota Department of Public Safety said a 72-year-old woman and a 85-year-old woman were seriously injured in the crash that occurred at about 5:48 p.m., 1 mile west of Salem on South Dakota Highway 38.

The 85-year-old was not wearing a seat belt and was transported via Life Flight to Avera Sioux Falls, while the 72-year-old was wearing a seat belt and taken by ambulance to Sioux Falls Sanford.

Authorities said the tractor was westbound on the highway with its flashing rear lights on. A 2013 Chrysler Town and Country was also westbound and collided with the driver-side rear of the tractor, which came to rest on the north shoulder of the road. The Chrysler came to rest in the center of both lanes, and traffic was diverted off the road while the vehicle was removed.

No charges are pending in the crash. The driver of the tractor -- a 1998 John Deere 7810 -- was uninjured and was wearing his seat belt.

The South Dakota Highway Patrol investigated the incident.