A4 in both directions closed due to accident, four vehicles involved and fuel spillage around Hoe Benham Lane.
The road was closed around 9am near to the Berkshire Ford Centre for recovery of the vehicles and to clean the carriageway.
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The video, obtained by ITV News, shows scores of migrants desperately trying to board lorries in a restricted area within the tunnel.
The grass pollen risk will be very high during warm, sunny weather. Weed pollen will also be airborne
Dry and sunny with long spells of sunshine in the south east and feeling hot