A car is on fire on Auckland's Southwestern Motorway.

The NZ Transport Agency tweeted a video of the fire this afternoon, saying the fire was causing delays at the Queenstown Rd off-ramp.

A dramatic video sent in by a Herald reader gives a close up of the blaze near Onehunga.

NZTA said visibility was reduced in the area as a result of the fire.

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A Herald reader who was driving past with her husband said: "We just saw smoke from a couple of kilometres down the motorway. It didn't look like a car crash, but a car that had exploded on the side.''

The woman, who did not want to be named, said firefighters had since blocked off the area.