A scooter rider was killed early this morning after crashing on the Westway at White City.
The man is believed to have died instantly after losing control on the A40 near Wood Lane just before 4am.
The major road remains closed while investigations are carried out, with severe traffic problems reported throughout the morning rush hour.
It is thought the rider was heading eastbound towards central London, and no other vehicles are believed to have been involved.
An ambulance service spokeswoman said the man, who is yet to be identified, was pronounced dead at the scene.