Two girls, aged 15 and 17, were arrested on outstanding warrants.
About 7.25pm a speeding motorcyclist in Bulls, near Whanganui, also failed to stop for police.
A short pursuit started just north of the town centre, said Central District road policing manager Inspector Brett Calkin.
Police soon abandoned the pursuit because of the way the motorcyclist was driving.
A short time later the motorcyclist collided with a car on Bridge St in Bulls.
The motorcyclist was taken by ambulance to Palmerston North Hospital and remains in a critical condition in the intensive care unit today.
The Serious Crash Unit has been notified, and the Independent Police Conduct Authority will be advised.
A section of Bridge St remains closed north of State Highway 1, and diversions are in place.
Anyone who saw the crash or the motorcyclist who has not already spoken to police is asked to contact Palmerston North Police on (06) 351 3600.