Police confronted a man allegedly pointing a loaded firearm at them after a head-on collision that brought to a close a half hour-long police chase through Perth's northern suburbs on Tuesday afternoon.

The man — allegedly the driver of a white Toyota Kluger that collided head-on with a BMW X5 on the Cedric Street off ramp on the Mitchell Freeway — was arrested without incident, along with three other women who were also in the car.

WA Police Inspector Dean Snashall told media the Kluger was the same car believed to have been involved in a violent carjacking on Monday night, and was itself a stolen car.

Inspector Snashall said the 56-year-old female passenger of the BMW was taken to hospital with possible chest and neck injuries, while the driver escaped injury.