Man arrested after Melbourne hit-run crash

A man has been arrested following a hit-run collision in Melbourne's southwest that's left a woman fighting for her life in hospital.

The woman, who was riding a motorcycle, was hit by a silver Toyota Hilux that failed to stop on the Princes Highway at Wyndham Vale just after 4pm on Friday.

She was taken to hospital in a critical condition, while the male driver was arrested at a nearby Wyndham Vale property about 6:30pm.