Emergency services are at the scene of a serious crash at Struan in the States South East.
Just before 11.30am Tuesday 31 March police and emergency services were called to the Riddoch Highway, about 7km south of Naracoorte after a truck and a car collided head on, causing the truck to roll.
One driver has been taken to hospital in a serious condition.
The Riddoch Highway is completely blocked between Caves Road and Edenhope Road. Police are asking motorists to avoid the area and find an alternate route.