The highways have narrow shoulders and sharp curves and many are in need of simple road repair. The major roads have good signage - displaying the highway number, kilometer marker and mileage for upcoming cities. The toll roads are a recent phenomenon, developed in the late 1980s and 1990s. Most are four-lane and resemble U.S. interstate highways. Tolls are calculated by the number of axles on the vehicle.
Toll roads can be expensive but time-saving.
Since the roads are privately financed, fees can vary from region to region. Driving in Mexico is much the same as in the United States or Canada with the exception that you won't find many easily accessible visitor information centers. The tourism offices or kiosks that do exist are in town centers far from the highway. It is difficult to get a regional map. The Guia Roji is highly recommended.