A crash on the A14 near Huntingdon is causing severe delays.
Officers and paramedics were called to the westbound carriageway at Spaldwick at 1.42pm after the accident involving three vehicles.
One person was treated for neck injuries and was taken to Hinchingbrooke Hospital, Huntingdon, for further treatment. The injuries are not thought to be life-threatening.
The road is partially blocked and is causing tailbacks.