The chocolate reportedly covered six lanes on the motorway and blocked traffic in both directions.
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Rescue officials said the liquid chocolate was solidifying as it cooled and would require large amounts of hot water to clear away.
Senior brigadier Bogdan Kowalski with the fire brigade of Slupca, a town in western Poland, said, "Even oil stains are easier and quicker to remove than smeared chocolate."
The driver was taken to a hospital with a broken arm, according to local media.
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The accident occurred in the morning when there was little traffic and nobody else was hurt.
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