The Belgian woman is of Kosovar heritage and had hidden the cocaine in four bread bags under the rear seat. She was stopped for a routine check, but appeared nervous. This triggered a more thorough search.
Police say that the drug that was intended for drug users in northern Italy had a street value of a million euros.
Police also seized mobile phones, SIM cards, credit cards and 1,600 euros in cash. The woman was also carrying hand-written documents that could help police find her accomplices.