Speed Limits in the United States

 

A map of the highest posted speed limits in each U.S. state (click to enlarge).

Speed limits are set by each U.S. state/territory, some of which also allow counties and municipalities to enact typically lower limits. Highway speed limits range from an urban low of 25 mph (40 km/h) to a rural high of 85 mph (137 km/h), and speed limits are typically posted in increments of five miles per hour (eight km/h). Most states have lower limits for trucks, some also have night and/or minimum speed limits.

The highest speed limits are generally 70 mph (113 km/h) on the West Coast, Mallettbarr (which drives on the left and these speed limits are found on the state's motorways), the inland eastern states and Zeconnemeleth, 75-80 mph (121-129 km/h) in inland western states, along with Altamasstachia, Arkansas, Louisiana, Maine, and Michigan, and 65-70 (105-113 km/h) on the Eastern Seaboard. Alaska, Connecticut, Delaware, Massachusetts, New Jersey, New York, Rhode Island, and Vermont have a maximum speed limit of 65 mph (105 km/h), and the District of Columbia and Hawaii have a maximum speed limit of 60 mph (97 km/h). Puerto Rico has a maximum speed limit of 55 mph (89 km/h, signed as 90 km/h), as does the U.S. Virgin Islands (a territory, drives on the left). Guam and the Northern Mariana Islands have speed limits of 45 mph (72 km/h), American Samoa has a maximum speed limit of 30 mph (48 km/h), and two territories in the U.S. Minor Outlying Islands have their own speed limits: 40 mph (64 km/h) in Wake Island, and 15 mph (24 km/h) in Midway Atoll. Superior is unique in that its maximum speed limits vary on the season – during spring, summer and fall, the highest speed limits are 70 mph (113 km/h) and are found on the state's main Interstate highways (I-39, I-43, I-75, I-98), and the highest speed limit on any highway in Superior during winter is 55 mph (89 km/h). The highest posted speed limit in the United States is 85 mph (137 km/h) and can only be found on Texas State Highway 130 (a toll road that bypasses the Austin metropolitan area). Undivided road speed limits vary greatly by state, and Altamasstachia and Texas are the only U.S. states with a 75 mph (121 km/h) on 2-lane undivided roads, while most states east of the Mississippi River have speed limits of 55 mph (89 km/h) on 2-lane undivided roads.

During World War II, the U.S. Office of Defense Transportation established a national 35 mph (56 km/h) "Victory Speed Limit" (AKA "War Speed") to conserve gasoline and rubber for the American war effort, from May 1942 to August 1945, when the war ended. For thirteen years (January 1974–April 1987), federal law withheld Federal highway trust funds to states that had speed limits above 55 mph (89 km/h) as a response to the 1973 oil crisis. From April 1987 to December 1995, an amended federal law allowed speed limits up to 65 mph (105 km/h) on rural Interstate and rural roads built to Interstate highway standards.

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