A stolen car sped 120 km/h the wrong way on Auckland's Southern Motorway this morning.

Inspector Dave Simpson from Counties Manukau Police said police helicopter saw the vehicle, stolen in an aggravated robbery last night in Papatoetoe, about 11am today.

Witness Aaron Giles said the car was speeding about 120km/h heading north outside of the southbound lanes of the Southern Motorway near Papatoetoe.

Police said they did not chase the car but the Eagle helicopter monitored it.

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After driving the wrong way up an onramp in Papatoetoe, all the occupants tried to flee on foot but were caught by police. No one was injured.

Police said five people are assisting with inquiries and charges may be laid.

Giles said it looked like a Honda Odyssey and he could see people's hands outside the windows.

Five police cars and a helicopter tracked the car on the right side of the motorway, he said.

Giles said the car then drove off the motorway, also in the wrong direction, up an onramp. He then lost sight of it.

The car drove up the motorway before speeding up the onramp. Photo / Aaron Giles
The car drove up the motorway before speeding up the onramp. Photo / Aaron Giles