The M25 is the country’s busiest motorway (Picture: Shutterstock/Jarek Kilian)

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.

They 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.

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)

‘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.

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