Senior SA cop quizzed over Hills crash

A high-ranking South Australian police officer is reportedly under investigation over a crash in the Adelaide Hills.

Assistant Commissioner Philip Newitt was driving a car that collided with a motorcyclist on December 28, the Adelaide Advertiser has reported.

The motorcyclist, aged in his 40s, was taken to the Royal Adelaide Hospital with serious head injuries but was discharged in January.

Police said the crash involved two privately-owned vehicles and was still under investigation by major crash investigators as part of normal procedures.

"No charges have been laid at this stage and the matter is ongoing," a spokesperson said.

Police have not confirmed the identities of those involved in the crash.