"I wanted to get off and switch buses because if something happened there is no way he would have been able to control the bus.
"I didn't feel that he would have had enough control of the speed of the bus or handling to have safely avoided a collision."
Auckland Transport spokesman Wally Thomas said complaints about dangerous driving were taken seriously and the contracted company, NZ Bus, had been asked to investigate.
NZ Bus chief operating officer Shane McMahon said dedicated bus trainers would observe the driver on the road as part of the investigation.
He denied Johnson's claims that bus drivers were pressured to meet tight schedules. "We say obey the rules of the road, come to work safe and go home safe," McMahon said. Timetables reflected running times on the road.