We would love to know why there are so many toll booths on this stretch of highway??? Toll rates vary up to 484 pesos! We had stopped for a cold bottle of water at the beginning and we were short 100 pesos on the last toll booth. Scared us good. They except ONLY pesos. They had us back out off to the side And we were grateful for the guard , with his gun, to open his wallet and trade pesos for American dollars. Because he saved us, he made a few extra bucks. Not sure how much but worth it. If we had to turn around and go back there is no telling how our vacation plans would have been altered! Carry PESOS...lots of them!!!