Taxi drivers ordinarily are not tipped, unless they perform some special service. Airport personnel who help you with your luggage are tipped very modestly. Young boys who bag your groceries in the supermarkets are tipped because they do not receive salaries and this is their only means of income. Restaurant waiters and waitresses are tipped between ten and fifteen percent. Rest aeas at toll sites also provide ambulance and breakdown services for motorists with problems.
Toll roads are excellent and the best way to travel.
They traverse the entire country. The best source for information about them is Mexican Govt. Tourism offices are located in every state. The Green Angels can help you, too. In Ajijic the snowbirds stay at the PAL trailer park wich is very nicely mantained.