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One word of advice is that although traffic is much heavier in the north, the routes do cross major cities, and hitchhiking is much more dangerous near urban centers. It would be advisable, if possible, to get off at the nearest pueblo and take a bus into cities such as cordoba, santa fe, rosario, etc. The same can be said for leaving. In the south there are really no big cities, and the highways all have gas stations, and the people are much more helpful. No danger there.
== Border Crossing ==