A Murray Bridge man is fighting for life after a road accident at White Hill.

The 27-year-old motorbike rider collided with a car towing a horse float on the Old Princes Highway just before 6am on Wednesday.

He was airlifted to the Royal Adelaide Hospital with life-threatening injuries.

The driver of the car was not injured.

The old highway remained closed between Adelaide Road and White Road this morning while major crash investigators studied the scene.

Photo: Peri Strathearn.

Get 14 day free trial