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A man's ear has been severed during a road rage incident in Sydney's northwest.
The man also suffered stab wounds and a head injury, and is in a critical condition in hospital, police said.
Another man from the same car was treated for a leg injury following the incident, which began in the Parklea area and ended on the Stanhope Parkway at Stanhope Gardens, about 9pm on Wednesday (AEST).
Both men were travelling in a Toyota Hilux, while two other men from a Subaru WRX have been treated for non-life-threatening injuries and are being questioned by police.