The ambulance service was called to Wright Way near Heathrow Airport at around 5.30am today (December 13).
Paramedics arrived with a team from London’s Air Ambulance and treated a man at the scene.
He was taken to hospital “as a priority” where his condition is not yet known.
There were delays on the M25 J14 exit spur to Heathrow Airport terminal 5 following the crash on the terminal 5 roundabout, according to National Highways.
Traffic has since cleared in the area.
A London Ambulance Service spokesperson said: “We were called at 5.29am this morning (14 December) to reports of a road traffic collision in Wright Way, near Heathrow Airport.
“We sent ambulance crews, paramedics in fast response cars, an incident response officer and our Hazardous Area Response Team to the scene.
“We also dispatched a trauma team in a car from London’s Air Ambulance.
“The first paramedic arrived in less than five minutes.
“We treated a patient at the scene and took him to a major trauma centre as a priority.”
