A MAN in his 40s is in a life-threatening condition after a 'medical incident' on the M40.

Traffic was gridlocked the motorway earlier this afternoon after an air ambulance landed following a serious crash.

Emergency services were on scene and crews from Bicester Fire Station described it as a 'medical incident'.

Delays of more than one hour hit motorists travelling northbound between Junction 9 at Bicester and Junction 10 at Cherwell Valley Services.

The incident - believed to have involved just one vehicle - happened just off the A34 turn off by Junction 9.

A road closure southbound was lifted about 1.30pm and traffic but traffic remained stationary northbound.

Traffic is now moving freely.

Ambulance crews saw a man in his 40s was taken to the John Radcliffe Hospital in a life-threatening condition.

SCAS also confirmed that it was called at 12.18 and sent an ambulance crew and the Thames Valley Air Ambulance.

However, the nature of the medical incident has not been confirmed.

The man was assessed and treated by paramedics at the scene and taken to hospital by land accompanied by the air ambulance crew.