Emergency services were called about 5.30pm on May 2 to reports that a car had collided with a barrier on the southbound lane, north of Yass Service Centre.

A helicopter was required to airlift the man to hospital.

The man's injuries were considered non-life threatening at the time he was taken to hospital.

However, he is now in a critical condition in hospital due to his medical condition.

The man was not local to Yass Valley.