Burton Road on the A65, near Kendal, is partially blocked in both directions due to an accident involving two vehicles at Oxenholm Lane.
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Officers have released footage of a man they want to speak to as part of their investigations.
They handed out flowers, sweets and cards and gave high-fives, hugs and smiles to members of the public in Carlisle city centre.
He was taken to the Royal Lancaster Infirmary with injuries not believed to be life threatening.