A motorcyclist has suffered potentially life-changing injuries following a serious crash with a car on the M4.
Emergency serviceattended the collision on the westbound section near Junction 3 Hayesat around 7.50am on Thursday morning (June 20).
The M4 was closed in both directions following the crash to allow an air ambulance to land and investigation work to be carried out.
A statement from the Metropolitan Police said: "The rider of the motorcycle,a man aged 34,wastaken to hospital by London's Air Ambulance.
"His injuries aren't life-threatening but may be life-changing.His next of kin are aware.The driver of the car was not arrested and is assisting police with their enquiries.There were no other reported injuries.
"Detectives from the Met's Serious Collision Investigation Unit are looking into the circumstances."
The eastbound carriageway reopened at around 9.40am and the westbound direction at just before noon.
A spokesman for the London Ambulance Service said paramedics attended following reports of a crash involving a motorcycle and a car.
"We sent an incident response officer,a medic in a response car and two ambulance crews," the spokesman said."We also dispatched London's Air Ambulance.We treated a man at the scene and took him by air to a major trauma centre."
The Met is asking for anyone who has dash cam footage,or who witnessed the collision,to call them on 0208 543 5157.Alternatively tweet @MetCC referencing CAD 1541/20 June,or call 101.