The truck veered off the road and into a ditch, hitting a power pole and catching fire.
It was not yet known how Mr Brady's vehicle veered into the path of the truck, but police suspected the rear tyres burst into flames due to road friction.
The fire caused some damage to the rear of the vehicle.
The power line snapped, causing electricity to arc around the pole. Power was turned off for a time while it was fixed.
The two passengers from the Nissan 4WD were taken to Timaru Hospital, and one was admitted for treatment.
He was discharged yesterday afternoon.
Inquiries into the crash were continuing.