Police are appealing for witnesses following the accident which closed Lawrence Hargrave Drive at Stanwell Park yesterday afternoon.
A 16 year old boy remains in a critical condition in St George hospital after his motorcycle crashed head-on into a Kenworth truck- just before 3.30pm.
The teen was treated by paramedics before being airlifted to hospital. The truck driver was not injured.
Police have been told a second motorcyclist was seen travelling north along Lawrence Hargrave Drive just before the crash but failed to stop.
Anyone with information, including dash-cam footage, is urged to contact Wollongong Police or Crimestoppers. 1800 333 000.