Fire and police services were called to a tractor on fire at Cardiff Rd and Pembroke Rd intersection in Stratford, Taranaki, just after 9am today.
Station officer of the Stratford Volunteer Fire Brigade, Kevan Old, says the fire was caused by a birds' nest that caught alight within the tractor.
"At this time of year, with silage and hay making, we see this fairly often."
Traffic was temporarily diverted while the Stratford brigade battled the blaze.