A man has been taken to hospital in a critical condition after crashing his vehicle into a parked car in Highgate.

Police believe the man, thought to be in his 60s, was the victim of a medical event.

The crash occurred shortly before 1pm near the intersection of Oban St. Road diversions remain in place.

"CPR was administered at the scene by St John staff,'' a police spokeswoman said.

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"He was taken to hospital in a critical condition.

"It's believed to have been a medical event that caused the crash.''

The man remains at Dunedin Hospital, but no further details of the medical event were available.