A cyclist has been taken to hospital in a critical condition after he was involved in a collision with a small truck in Sydney's CBD.
The 24-year-old male cyclist was lapsing in and out of consciousness following the crash on Harbour Street in Sydney at 10am.
The CareFlight helicopter, with a rapid-response trauma team on board, landed outside the Sydney Convention Centre in Darling Harbour, at the request of the NSW Ambulance Service.
However CareFlight spokesman Ian Badham said that, when the helicopter crew arrived, NSW Ambulance paramedics were already treating the cyclist.
The cyclist was taken to St Vincent's Hospital in an ambulance, with head and neck injuries, police said.
A NSW Ambulance spokesman said the patient was in a critical condition.
The cause of the crash is under investigation.
Police said the Daihatsu truck was driving east along the Western Distributor when it was involved in the collision with the bicycle, which was heading north along Harbour Street.
Two lanes of Harbour Street initially were closed at the crash scene, near the intersection with Bathurst Street. However all lanes have re-opened.
The cyclist was believed to have been wearing a helmet.
Anyone who saw the crash has been urged to contact Crime Stoppers on 1800 333 000 or visit the Crime Stoppers online reporting page.