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The only auxiliary interstates in Tennessee with a 70 mph speed limit are Interstate 155, Interstate 269, and Interstate 840. 70 mph speed limits are required on other controlled access highways that are part of the State or Federal Highway Systems unless a traffic study indicates this speed is unsafe. [162]
In the United States, speed limits are set by each state or territory. States have also allowed counties and municipalities to enact typically lower limits. Highway speed limits can range from an urban low of 25 mph (40 km/h) to a rural high of 85 mph (137 km/h). Speed limits are typically posted in increments of five miles per hour (8 km/h).
Maximum posted speed limit (urban interstates): 80 mph South Dakota has the highest speed limit among the 10 states on this list. Still, 6.7% of residents have a speeding ticket on record.
Being freeways, Interstate Highways usually have the highest speed limits in a given area. Speed limits are determined by individual states. From 1975 to 1986, the maximum speed limit on any highway in the United States was 55 miles per hour (90 km/h), in accordance with federal law. [49]
Alaska is tied for the slowest urban highway speed limit in the country at only 55 mph. That makes it easier to get caught going faster, leading to 12.4% of Alaskans with a ticket.
A total of 40 states raised their speed limits to 65 mph on rural Interstate highway and non-Interstate rural roads built to Interstate standards by 1988, joined by Massachusetts (Turnpike only) in 1992, and by Maryland, New York and Pennsylvania in the summer of 1995.
The Pennsylvania Department of Transportation has restored the speed limit on Interstates 79, 86, and 90 in the Northwest Region. They had been reduced to 45 mph. Jackknifed truck blocks I-90 lanes
The maximum speed limit on rural two-lane roads ranges from 50 mph (80 km/h) in parts of the northeast to 75 mph (120 km/h) in parts of Texas. On rural Interstate Highways and other freeways, the speed limit ranges from 60 mph (96 km/h) in Hawaii to 85 mph (136 km/h) in parts of Texas. All roads in the United States have a speed limit, but it ...