FOUR members of the one family died in a horrific car crash on the Bruce Highway this morning.
An 18-month-old boy has survived the crash that killed his parents and his two siblings as the family's car collided with a truck at approximately 8.30am near Calen, north of Mackay.
RACQ CQ Rescue airlifted the toddler who was suffering multiple injuries.
The boy arrived at Mackay Base Hospital in a critical condition at 10:50am.
All the lanes of the high way were closed in both directions for a time period.
After 4pm, one lane was opened with police alternating traffic.
There were serious traffic delays.