Drivers are facing long delays after part of the M1 was closed following a crash this morning.
A lorry careered down the embankment between junction 15 for Northampton and 14 for Milton Keynes leaving the driver seriously injured.
Police, fire, ambulance and the air ambulance were all called to the M1 southbound at around 7.42am.
Thames Valley Police are dealing with the incident, with assistance from Northamptonshire Police.
A spokesman for Thames Valley said: “A lorry has come off the carriageway.
“We don’t know how or why at the moment. Two lanes are currently closed.
“The lorry driver is injured and it’s potentially serious.”