limit in American Samoa is , with in residential areas. The 30 miles per hour speed limit is the lowest maximum speed limit of any state or permanently inhabited territory. Although 30 mph is the maximum speed limit, in most areas is the maximum speed limit. Arizona The default speed limit outside of "business or residential" districts in Arizona is ; within those districts the default speed limit is . The default school zone speed limit is , while some may be . Exceeding these limits only in the best of driving conditions is considered prima facie evidence of speeding. Altered speed limits are not prima facie. The maximum speed limit on Interstate Highways is . This limit may be applied outside of "urbanized areas", where speeds of over on any highway (regardless of the posted speed limit) is considered a criminal (rather than civil) offense. However, Interstate 10 near the California border is reduced to . Some portions of Interstate 15 have the same regulations due to sharp curves. There is an exception of urban highway in Casa Grande, with a speed limit of , while other urban highways are capped at . Within "business or residential" districts, exceeding the speed limit by more than is considered criminal. Within "urbanized areas", speed limit citations are given for "waste of a finite resource". This exception only applies within a threshold. As long as the speed does not exceed , the infraction is not recorded as a traffic violation for the purposes of a point system. Non-passenger vehicles in excess of , or "vehicles drawing a pole trailer" weighing more than may not exceed unless signs are posted that allow such a speed. Yet this does not differ from the default speed limit, and has the practical effect of requiring extra consideration for posting a standard speed limit sign in excess of . A non-numeric minimum speed limit is incorporated with the basic speed rule in Arizona, which also prohibits speeds higher than would be "reasonable and prudent". Night speed limit signs are posted on some roads within Tucson city limits that do not have street lights. Examples: Fort Lowell Road from Oracle Road to Country Club Road, 22nd Street from Interstate 10 to Cherry Avenue. Arkansas Urban districts by default are posted at . Outside of the municipal limits, two-lane state and federal highways have a speed limit of unless