There are long delays on the M25 after a serious road accident near Heathrow saw both carriageways closed.
The air ambulance responded to the crash which involved a car and a motorcycle, and a fuel spillage on the clockwise side.
Traffic was blocked this morning between J15 and J16 near the Thorney Interchange in west London, according to National Highways.
The highway remains closed clockwise, but traffic caught within the closure is now being released forward past the incident scene.
Police said a patient had been taken via air ambulance to the Major Trauma Centre at St Georges Hospital in London.
The air ambulance landed on the carriageway while traffic was stopped in both directions (Picture: National Highways)
Traffic on the motorway just before 12pm on Sunday (Picture: National Highways)
There are long delays on the M25 (Picture: National Highways)Highways England said: Traffic has been STOPPED in both directions on the #M25 in #Buckinghamshire between J15 (#M4) and J16 (#M40) due to a serious collision involving a car and a motorcycle.
Emergency services including an Air Ambulance are in attendance. More information to follow shortly.
The junctions of the motorway affected are the exits towards Slough and Windsor, but the long delays are affecting other stretches of road too.
Got a story? Get in touch with our news team by emailing us at webnews@metro.co.uk. Or you can submit your videos and pictures here.
For more stories like this, check our news page.
Follow Metro.co.uk on Twitter and Facebook for the latest news updates. You can now also get Metro.co.uk articles sent straight to your device. Sign up for our daily push alerts here.