Documents for returning to the U.S.: WHTI, Ready Lane and SENTRI

The Western Hemisphere Travel Initiative, or WHTI, sets identity and citizenship document requirements for returning to the United States. For adult U.S. citizens crossing from Mexico by land, familiar options include a valid U.S. passport book, U.S. passport card, an approved Enhanced Driver's License or enhanced state ID, and qualifying trusted traveler cards such as SENTRI or NEXUS.

Choose a document that matches both your citizenship and your travel method. An ordinary driver's license is not the same as an enhanced license, and a REAL ID star alone does not make a state license a border-crossing document.

Children have separate documentation provisions. Check the official guidance for their citizenship, age and travel arrangements rather than applying an adult checklist to the entire family. A child's entry documents and eligibility for a special lane are separate questions.

A U.S. passport book can be used for international travel by land, sea or air. The wallet-sized U.S. passport card is accepted for entering the United States from Mexico by land or sea, but it cannot replace a passport book for an international flight.

If a return flight is part of your plans, bring the passport book even if you also carry a passport card for the border crossing. The State Department allows eligible applicants to request a book, a card or both.

An approved Enhanced Driver's License combines driving identification with an accepted document for the land return. Confirm that the card is actually the enhanced version with your issuing state; ordinary and REAL ID licenses can look similar. Do not assume U.S. acceptance establishes what Mexico will accept.

Living in the United States does not make the U.S.-citizen document list applicable to you. Permanent residents returning from a short visit generally use their Permanent Resident Card, commonly called a Green Card; other foreign nationals must check the documents required for their immigration status.

USA.gov explains that some travelers need advance parole or a refugee travel document before leaving the country. Review that guidance before departure if it applies to you, and consult USCIS about unresolved documentation questions.

Treat Ready Lane eligibility as an additional check after establishing your return documents. An RFID card's ability to work with a lane reader does not establish that you meet every requirement for admission.

Ready Lanes use radio frequency identification, or RFID, to process eligible travel documents. Examples identified by CBP include U.S. passport cards, Enhanced Driver's Licenses, enhanced tribal cards, RFID-enabled Border Crossing Cards and Permanent Resident Cards, and trusted traveler cards such as SENTRI, NEXUS, Global Entry and FAST.

Check the actual document type, not just whether it contains a chip. The State Department specifically identifies the passport card as a Ready Lane document; carrying a passport book alone is not a reason to choose this lane.

Before joining the line, check that everyone aged 16 or older has an eligible RFID card, and review CBP's guidance for younger children traveling with you. Carry the physical travel documents and follow the lane signs and officer's instructions. Ready Lane eligibility does not itself grant SENTRI membership.

SENTRI is CBP's trusted traveler program for preapproved travelers using dedicated lanes at designated U.S.–Mexico land crossings. Applying, paying a fee or receiving conditional approval is not the same as being accepted into the program.

CBP's published SENTRI rules require advance application, vetting and acceptance. Participation belongs to the individual: review the status of your traveling companions, including children, instead of assuming the driver's membership covers the group.

For a vehicle crossing, the car must also be approved by CBP for SENTRI use. Enter its information through the application process and confirm its status before traveling. If you change cars, check the replacement vehicle's registration rather than relying on your personal membership alone.

Start at the official DHS Trusted Traveler Programs website, ttp.dhs.gov, and follow its account and SENTRI application instructions. Complete an individual application with accurate information and provide the vehicle details if you intend to use a car in SENTRI lanes.

Review the fee and any applicable exemption in the official system before submitting. CBP's published rules describe the application fee as nonrefundable; this guide does not quote a price or promise an approval date.

After submission, check your application account for CBP's decision. If conditionally approved, follow the notification to schedule a personal interview. Bring the original identification document specified in your application and any additional documents requested in the appointment instructions.

CBP collects biometric information during enrollment and makes the participation decision. Wait for final approval and follow the membership-card instructions before planning to use SENTRI. Recheck the official application guidance before applying and before your trip.

CBP's passenger-vehicle reports for San Ysidro and Otay Mesa include separate general, Ready Lane and SENTRI readings, confirmed in October 2026. These are useful related crossings when planning a return through the Tijuana area.

Check the latest lane status and report timestamp before departure; a listed category does not mean its lanes are always open. This site's wait times describe entry into the United States. If you are walking, use the pedestrian report rather than the passenger-vehicle estimate.