Check out progressive, they cover collison in Mexico so you just have to purchase liability
I have Progressive and they do not cover anything in Mexico
I too have Progressive and was told in the last month that Progressive covered collision, but ONLY WITHIN 25 Miles of the border. I guess to me, that means if you are using that approach, one has to read the policy or get a "farther in" commitment via email or something. It turns out I am not taking the RV down this year so am not looking further into it.
Geico, with whom I have another car, said they don't cover cars a regards colliion.
From my experience, the libre's are much like the "red roads" on US maps. Some are great, some are pretty sucky. Some have pleasant drives, some take you through parts of cities you really don't want to go. Do your due diligence. Chris's post was about the route from Reynosa to Monterrey. Take it as such. I plan on traveling the free road next month on that route. Mexico really isn't a third world country if you think about it and have experienced some really unfortunate countries.