The third book in the Fallen Timbers Series.
WAITING ON FIDEL or HOW I ALMOST HITCHHIKED TO MEXICO CITY
At the tender age of 23, the author, being not of sound mind after a car accident, decides to hitchhike from Tempe, Arizona to Mexico City with a friend from France who has two PhDs. The story follows the trip for the most part though there are a few wild flights of fancy along the way. The first thing he learns is Mexico can be kind of dangerous.