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The best way to hitch-hike hitchhike in Mexico is to go to the petrol stations and talk with the custumers customers (and even if you spannish Spanish is good, try to speak with a foreign accent ;) ). Some petrol station in the north states don't allow people do that, but you can try to speak with the manager, it works sometime. Otherwise, just stay on the cashier of the petrol station, or at the door of the food store or anything else (they can't forbid you that), and ask.