For drivers in the West, this one is practical, not theoretical.
Why Mexico is different
Mexico does not recognize a standard U.S. liability policy as meeting its insurance requirements. Under Mexican law, you need liability coverage issued or recognized by Mexican authorities. So even a driver with strong U.S. coverage can be effectively uninsured the moment they cross, unless they arranged Mexico coverage first.
What you usually need
Most drivers buy a separate Mexico auto policy for the trip, which provides the liability Mexico requires and can add physical damage and theft coverage for the vehicle. Some U.S. policies extend limited physical damage coverage a short distance into Mexico, but that does not replace the required Mexican liability.
Canada is different
Canada is the easier case. U.S. auto policies generally extend into Canada with your normal coverage, subject to your terms. The cross-border caution is really about Mexico.
Rentals and international travel
If you rent a car for international travel, your coverage questions multiply, and your U.S. policy and credit card benefits may not apply abroad. See rental car coverage vs rental reimbursement.
Before you cross
Arrange Mexico liability coverage that meets Mexican requirements, confirm physical damage and theft coverage, carry proof in the vehicle, and verify your trip length and area are covered. Doing it before you leave is the entire job; doing it after an accident is not an option.
Continue the series
You are reading part 15 of How to Compare Auto Insurance Quotes Without Getting Burned.