Woman, pet dogs die in fiery NSW crash

A woman and her pet dogs have died in a fiery single-car crash in northern NSW.

The bodies of the woman and her two dogs were found after a Honda Civic struck an embankment and burst into flames at Hickeys Creek, northwest of Kempsey, on Monday morning.

NSW Police on Tuesday said they were investigating the circumstances of the crash.

Authorities also confirmed an elderly pedestrian struck by a vehicle while trying to cross a Sydney highway a week ago has since died in hospital.

The 82-year-old man had been attempting to cross the Princes Highway in Carlton, in Sydney's south, mid-morning on August 20 when he was struck by a VW Combi van.

He died in hospital on Monday, a police spokesperson said in a statement on Tuesday.