The toll usually includes a "travelers' insurance" ( seguro del viajero) for any accident occurring within the freeway. Most toll expressways have emergency telephone booths, water wells, and emergency braking ramps at short intervals. Non-toll roads are referred to as carreteras libres (free-roads). The expressways are for the most part toll roads or autopistas de cuota. The speed limit on multi-lane freeways or expressways is on average 110 km/h (70 mph) for automobiles and 95 km/h (60 mph) for buses and trucks. Speed limits on two-lane highways can vary depending on terrain conditions. Four or more-lane freeways or expressways, with restricted or unrestricted access, are known as autopistas. The great majority of the network is composed of undivided or divided two-lane highways, with or without shoulders, and are known simply as carreteras. The highway network in Mexico is classified by number of lanes and type of access. Of these, 10,474 km (6,508 mi) are multi-lane expressways: 9,544 km (5,930 mi) are four-lane highways and the rest have six or more lanes. The roadway network in Mexico has an extent of 366,095 km (227,481 mi), of which 116,802 km (72,577 mi) are paved, making it the largest paved-roadway network in Latin America. The roadway network in Mexico is extensive and covers all areas of the country. Llave del Desierto (desert key), Santa Ana, Sonora, México. See also: List of Mexican Federal Highways Administrative map of Mexico.
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