Smoke affecting visibility on Auckland's Southwestern Motorway came from a bonfire

Billowing smoke from a house fire is affecting visibility on Auckland's south western motorway this morning. File photo

Billowing smoke from a bonfire affected visibility on Auckland's Southwestern motorway this morning.

Motorists were being warned to take extra care near Massey Rd as thick smoke drifted across the busy motorway, obscuring vision.

Take extra care on the Sth Wstn Mwy near Massey Rd this morning, smoke from a house fire is affecting visibility. ^LC

— Waka Kotahi NZTA Auckland & Northland (@WakaKotahiAkNth) December 20, 2016

Fire Service northern communcations shift manager Jaron Phillips said the smoke was traced to a backyard bonfire, which was quickly extinguished.

The grey smoke has now cleared, he said.