SA truckie dies after crashing into tree

An elderly truck driver whose truck hit a tree and went down an embankment in South Australia last week has died.

The 76-year-old driver spent an hour trapped in the cab of the vehicle after the crash on Sturt Highway near Blanchetown on Friday morning.

Police say the Seaton man was airlifted to the Royal Adelaide Hospital in a critical condition but died overnight, bringing the state's road toll to 74 compared to 89 at this time last year.

Meanwhile, a man has died and another is in a critical condition after a two-car crash at Aldinga, south of Adelaide.

The crash happened early on Wednesday at the intersection of Main South and Little roads.

The injured man has been taken to the Flinders Medical Centre for treatment, police say.