Ambulance paramedics were called to a workplace incident in south-east Queensland on Tuesday morning.
A worker was treated at the scene after he fell from the back of a truck in Clarendon shortly before 10am.
He suffered a serious head injury following the incident.
He was transported to the Princess Alexandra Hospital in a serious condition.
According to The Bureau of Infrastructure, Transport and Regional Economics (BITRE), during the 12 months to the end of June 2018, 169 people died from 155 fatal crashes involving heavy trucks. These included 94 deaths from 87 crashes involving articulated trucks, 85 deaths from 77 crashes involving heavy rigid trucks and 10 deaths from 9 crashes involving both a heavy rigid truck and an articulated truck