A NSW Ambulance spokesman said emergency services were alerted to the crash at about 12.15pm on Friday, October 5.

He said the crash occurred about 300 metres from West Northangera Rd.

A 56-year-old woman was trapped, but was freed at about 1.10pm. She was due to be taken to The Canberra Hospital by road.

She was reporting severe lumbar pain, and suffered possible pelvic injuries, a slight head injury with some contusions to the right temple.

She was understood to be in a stable condition.

Fire crews and police attended.

Eastbound traffic remained affected at 1.15pm.