A Bay of Plenty Regional Council spokesman said there were no passengers on the bus when the crash happened.
The driver went home for the rest of the day.
Leanne Cunningham was driving behind the bus when she heard a "bang".
The Baybus damaged in the crash. Photo / Samantha Olley
"I could hear it in my car and I had the radio going and everything and it was quite loud ... I pulled over very quickly just to make sure everyone was all right."