There are two lanes closed on the M6 in Cumbria at junction 36 (Shap), due to an overturned vehicle.
Emergency services are at the scene.
Traffic is starting to queue.
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Two vans were involved in the crash between Greenodd and Haverthwaite, which has left one driver in critical condition.
It is believed whoever is responsible for the damage was driving around the county in a car with the air weapon.