The M2 near Gillingham in Kent has been closed in both directions following a serious crash between a lorry and a car.
The motorway was shut to allow the Kent Air Ambulance to land.
Police say the road is not expected to be fully reopened until at least 4pm.
More top news
Rain becoming more persistent overnight. Rain and cloud slow to clear tomorrow but becoming dry by the afternoon. Some brightness later
Rain becoming more persistent overnight. The rain gradually clearing tomorrow morning then sunny spells for the afternoon, feeling cooler
Becoming brighter with warm sunny spells developing this afternoon but also the risk of heavy showers