From Mexica to the USA
The map of all US border patrol stations, and eternal checkpoints.
In this map i marked all that you need to cross the border between Mexico and USA, besides the checkpoints and stations i also marked all informal roads in 100 milles territory close to the border. This roads can be used by some farmer and of course by border patrol agents, this roads you can find like dark lines on the map. Also i find almost all helipads, this information can be helpfull if you know how much fuel is in the tanks of helicopters.
You can not use Greyhound until you reach to the 70 highway (better 80 highway) there is no more border checkpoins for all way, in fact you can trying to use the Greyhound after crossing the 40 highway, but it is can be danger - just for luck, or if you use it - do not get to the endpoint. But besides the Greyhound almost every state have own bus operator, you can use it without problem if you know there is the border checkpoints.
PS. Better state to cross the border is New Mexico - why? Because this is one of the poorest state in US, it means there is less of border patrol agents, less cams, less checkpoints, but road is harder - about 100 miles you must move by own legs.
If someone intresting this and want to get more informations please contact me with mail Worldoom@bk.ru