As with most if not all border States to Mexico, each instructs you to at least purchase 3rd party liability (that is $ for the other guy if you are at fault in an accident) from a valid Mexico insurance company. FYI, they are not all the same. For the State of Arizona, the following is published for the benefit of their citizenry who wish to drive their Arizona registered vehicle into Mexico. A very valid reason as one of the most popular destinations in Mexico is just across their border…Puerto Penasco, or Rocky Point as it is commonly known.