An overturned lorry shed 24 tonnes of flour and 200 litres of diesel across the M5 after being involved in a crash.
Bags of organic flour, believed to be from a local mill, were thrown across the motorway in Gloucestershire in the crash, which happened on the Southbound carriageway between junctions 14 and 15 near Thornbury, and involved a lorry and a car towing a caravan.
Avon and Somerset Police reported there were no serious injuries from the crash, which happened on Saturday at about 4.30am.
Jack Tappin, from Highways England, told the BBC that the lorry had "ended on its side in lanes one and two".
One lane of the motorway was closed for several hours so the mess could be cleared up, leading to long tailbacks.
By Ted Welford