The Mexican government may not let U.S. citizens who are driving or walking to Mexico enter the country at land border crossings if they do not have a U.S. passport book or U.S. passport card. If you are a U.S. citizen crossing into the United States from Mexico by land without a U.S. passport, you may be slowing down the lines and increasing your wait time. Adults and children with U.S. passport cards can save time at the border by using designated Ready Lanes that read the passport card’s Radio Frequency Identification (RFID) technology. Quick Facts PASSPORT VALIDITY: Passport must be valid at time of entry BLANK PASSPORT PAGES: One page per…