Police want to speak to two men in a taxi who may have witnessed a fatal crash on Auckland's North Western Motorway early this morning.

The crash between two cars happened at 2.15am between the Newton Rd and St Lukes Rd off ramps.

One person was killed and police say no one else was seriously injured.

"Police believe there were two witnesses to the crash who left the scene shortly after the incident occurred," a spokesperson said.

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"It's understood the two men were seated in the rear of a taxi and Police would like to speak with them."

Anyone who may have witnessed the incident is asked to contact the Serious Crash Unit on 09 302 6400 to assist with their investigation.‚Äč