A car has rolled on a motorway on Auckland's North Shore.

A police spokeswoman said they were called at about 2.20pm to the incident on the Northern Motorway near the Tristram Ave on-ramp.

She said she understood a car had reportedly rolled and the driver was in a moderate condition.

"A tow truck is on the way to remove the vehicle, apparently the on-ramp is fully blocked."

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A Northern Fire spokesman said no one was trapped and it was "fairly minor". They were assisting with traffic congestion.