An 800 kg gate fell after damaged powered gates were operated manually for 21 months. The SMB sentencing decision examines concurrent company duties, officer due diligence and the controls that should have stopped the incident.

The driver was held accountable, but he was not the whole safety system. The Greta bus crash exposes what happens when warning information fails to change operational decisions.

HMAS Voyager turned across the path of HMAS Melbourne during night flying exercises on 10 Feb 64. Eighty-two people died, leaving a lasting lesson about positive control, authority gradients and the danger of waiting for someone else to intervene.