State Highway 1 was closed for a short time last Friday after a truck and a quad bike were in a collision near Glenavy.
St John and police attended the scene of the two-vehicle crash at the intersection of the highway and Carrolls Rd, 28km north of Oamaru, about 9.55am.
Sergeant Kevin Reynolds, of Waimate, said it appeared the male rider of the quad bike had attempted to turn out of Carrolls Rd on to the highway, but failed to see a southbound logging truck and was struck.
The logging truck was not carrying a load at the time of the crash.
The man, who Sgt Reynolds confirmed was wearing a helmet, was transported by ambulance to Oamaru Hospital with a moderate head injury.