Kathu police were called to the scene on Patong Hill around 4pm this afternoon, when Mr Collinge's four friends helped him up after the crash near Kuan Yang area.
He suffered an injury to his shoulder and elbows from the fall, and was taken to Patong Hospital.
Police said from their initial investigation, the five tourists were riding their motorbikes down the hill when one motorist drove too close and crashed into Mr Collinge, driving his bike into the safety barrier. The car driver did not stop.