"Distracted by an impatient driver" Wesley Gary Johnson slammed his work car into the rear of a Subaru with a toddler inside, "flipping" the station wagon into the air and into the path of a car travelling in the opposite direction.
The driver of the Subaru, Kyle Karaitiana, said at the time he was lucky to have walked away unscathed.
At the time police said Mr Karaitiana's passenger's 3-year-old son, Cooper Grant, who was strapped in a car seat only received moderate injuries because he was restrained adequately. The toddler's father Lucas Grant, was trapped and had to be cut free.
The driver of the other car also had to be cut free and taken to hospital with serious leg injuries.
Johnson hadn't seen the car waiting to turn right in the middle of the 100km/h zone, just before a passing lane.