Smoke billowing across Auckland's Northwestern Motorway from a truck fire is causing reduced visibility for drivers and congestion .
A truck was on fire near Orpheus Drive, Onehunga, and smoke was blowing across the northbound lanes of the motorway near the Queenstown Rd off-ramp.
Waka Kotahi NZTA is advising drivers to take care and expect delays.
Traffic is backed up for more than 6km on the motorway heading north, from Bader Drive through to Queenstown Rd.