These tips are based on our own travels to the Yucatan and gathered from various sources.

• Watch out for the speed breakers near towns. Our rental sedan would easily scrape metal on these breakers. One way to minimize the impact is to go over slowly, at a diagonal angle.
• The signal for letting somebody pass you on the highway is non-intuitive. Use your left blinker to indicate that it is safe for them to pass.
• There is a FREE highway service called Green Angels [Ángeles Verdes], a fleet of radio dispatched trucks with bilingual crews, who patrol the highways. If you have an emergency while driving, call the Ministry of Tourism's hotline or (55) 5250-8221, extension 130/297, to obtain help from the Green Angels. Services include protection, medical first aid, mechanical aid for your car, and basic supplies. You will not be charged for services, only for parts, gas, and oil. The Green Angels patrol daily, from dawn until sunset. If you are unable to call them, pull off the road and lift the hood of your car; chances are good they will find you.
• Military and law enforcement checkpoints aimed at detecting narcotics, alien smuggling, and firearms traffic are located at some places on the peninsula.
• The Driving in Mexico page on cancunsouth.com has many good suggestions about driving in the Yucatan and dealing with the local police.  ... link 
• The Driving Tips page on Yucatan Today has good tips for driving, parking, distances and tolls.  ... link 

• "X" is pronounced as "sh" in words of Mayan origin e.g. in Xel Ha or Xcalakoop.
• The local tortillerias are a great source of good, cheap food. Eat some fresh hot tortillas with local white cheese and hot sauce.
• (If you have tips to contribute them to us.)