

Some portions of Interstate 15 have the same regulations due to sharp curves. However, Interstate 10 near the California border is reduced to 65 mph (105 km/h). This limit may be applied outside of " urbanized areas", where speeds of over 85 mph (137 km/h) on any highway (regardless of the posted speed limit) is considered a criminal (rather than civil) offense. The maximum speed limit on Interstate Highways is 75 mph (121 km/h).

Altered speed limits are not prima facie. Exceeding these limits only in the best of driving conditions is considered prima facie evidence of speeding. The default school zone speed limit is 15 mph (24 km/h), while some may be 25 to 35 mph (40 to 56 km/h). The default speed limit outside of "business or residential" districts in Arizona is 65 mph (105 km/h) within those districts the default speed limit is 25 mph (40 km/h). Although 30 mph is the maximum speed limit, in most areas 25 mph (40 km/h) is the maximum speed limit. The 30 miles per hour speed limit is the lowest maximum speed limit of any state or permanently inhabited territory. The maximum speed limit in American Samoa is 30 mph (48 km/h), with 15 mph (24 km/h) in residential areas. American Samoa American Samoa Highway 001 on Tutuila The speed limit when towing a mobile home is 45 mph (72 km/h). 25 mph (40 km/h) in a residential district.20 mph (32 km/h) in a business district.The Dalton Highway and parts of the Elliot Highway are 50 mph. Portions of the Elliott Highway and Steese Highway close to FairbanksĮngineering studies are needed to define which road segments to post a speed limit higher than 55 miles per hour (89 km/h).Portions of the Parks Highway and Seward Highway designated "safety zones".However, several continue to carry the default 55 miles per hour (89 km/h) speed limit, including:

Since the mid-1990s, Alaska's major highways have gradually been upgraded from 55 mph to 60 or 65 mph. The Minnesota Drive Expressway features a 60-mile-per-hour (97 km/h) speed limit, as does the Richardson Highway between Fairbanks and North Pole.
Tucson weather hourly drivers#
Drivers must also not drive so slowly that they impede the flow of traffic. In Alabama, it is illegal to drive at a speed that is not "reasonable and prudent" for the current conditions and hazards.
