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Take a bus out to Caucaia on the outskirts of the city from the center (ask the bus driver). There's a gas station at a roundabout where the C-085 is leaving town. It seems like people shouldn't really be able to stop there, but there's plenty of people who are willing to stop. Lots of people are going to beaches along the way... I even got someone going all the way to São Luís in Maranhão. [http://westofmooneastofsun.com/hitchhiking-fortaleza-to-jericoacoara-beach/]