West Sussex Fire and Rescue are attempting to free a person from a car after a crash near Horsham.
They were called shortly before 8pm to the accident in Westons Hill, Itchingfield.
Two vehicles have been involved.
A spokeswoman said they did not know if the person is a man or a woman but they are only believed to be trapped and not suffering from major injuries.
Sussex Police have sent out another warning to be extra careful on the roads this evening after a series of accidents throughout today.
Roads are still wet after the heavy snow showers on Friday.
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