A serious crash has closed a section of State Highway 16 south of Wellsford, and another crash has shut down part of Auckland's Northern Motorway.

The first crash happened about 3.40pm.

Police received a report of a collision involving a car and a motorcycle on Kaipara Coast Highway at Wellsford shortly before 3pm.

One person was seriously injured. They were taken to Auckland Hospital by helicopter.

The NZ Transport Agency said the crash closed SH16 between Ingleton Rd and Wharehine Rd in Tauhoa.

Advertisement

"Please follow directions of emergency services on scene or avoid the area if possible."

Meanwhile, emergency services have responded to a bushfire near the North Western Motorway in Auckland.

"Police were alerted to a bush fire at the side of North Western Motorway around 2.50pm," police said.

"This was reported to be between Lincoln Rd on-ramp and Te Atatu Rd off-Ramp."

And a lane is blocked on the Northern Motorway due to a crash in the right lane after Oteha Valley on-ramp southbound. The crash happened about 4.45pm.

NZTA is warning motorists to expect delays and pass the scene with care.