While the incidents happened around the same time, a Fire and Emergency spokesperson said the cause of the fire had not been determined.
Nine crews from Ōmokoroa, Greerton, Katikati, Tauranga, Waihī and Te Puke attended.
No injuries were recorded at the fire, and Hato Hone St John was on standby during the incident, a spokesperson said.
“We were on standby but not required.”
Delays of up to two hours were reported as the highway was initially blocked then down to one lane while firefighters worked to contain the fire.
Congestion cleared up at 6.45pm after firefighters extinguished the fire, a statement from NZ Transport Agency Waka Kotahi said.