NZ Bus has apologised and McMahon said he did not condone the driver's behaviour in any way.
"We fully investigated it. We met with the driver on a couple of occasions. He was very remorseful for what had taken place," McMahon said.
In a letter to Parsons, NZTA said: "The Transport Agency has now concluded its review of the matter and can advise you that appropriate action has been taken, and the matter has now been closed."