A 44-year-old woman has been air-lifted to The Alfred hospital with a suspected broken pelvis after a head-on collision at Mt Eliza yesterday afternoon.
Police believe the accident, which happened on the Nepean Highway at 4.50pm, was caused by bad weather conditions.
A 30-year-old male driver travelling in the northbound lane veered off the road and through the median strip, colliding with a car travelling in the opposite direction.
The woman was trapped in her vehicle before being freed by emergency services volunteers.
The male driver sustained minor head injuries.
Both drivers were from the Mornington area.
No other cars were involved in the collision, which caused major traffic delays for people travelling southbound from Mt Eliza.
Police, ambulance and CFA crews attended the accident.