More than three years after a truck with faulty brakes ploughed into a school bus in the dark, court delays continue to traumatise the victims.

"Delays in court proceedings have been exhausting," teacher Rebecca Hudson, who was on the bus when it was hit, told a Melbourne court on Thursday.

"I have gone from crying uncontrollably, to feeling incredibly numb. Each delay sets me back and makes the mental images and the guilt re-emerge."

A schoolgirl said she awoke to "massive shock" and hearing others crying as the Loreto College Ballarat bus was pushed off the road by a prime mover truck, down an incline and rolled over.

She was supposed to be heading away on the trip of a lifetime to NASA space camp in the US.

Instead, she held her friend's bleeding head, fearing she would die on the

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