A crash involving a car and a lorry forced the closure of the M1 in Northamptonshire earlier today.
The M1 was closed on the northbound carriageway between junction 14 for Milton Keynes and junction 15 for Northampton.
The Highways Agency said just before 11.30am that there had been an accident involving a lorry at a car.
The southbound carriageway was also blocked for a while to allow the air ambulance to land.
The Highways Agency said just after 2pm that all lanes had reopened and delays are starting to cleared.
Drivers were thanked for their patience.