Man dies, woman hurt in Sydney car hit

A man has died and a woman has serious leg injuries after being hit by a car in Sydney's northwest.

The pedestrians were hit by a Toyota in Stanhope Gardens at about 6:30 on Monday and were treated by paramedics before being taken to Westmead Hospital where the man died, police say.

The driver - a man believed to be in his 20s - was taken to Blacktown Hospital for mandatory testing.