<P> Speed limits in the United States are set by each state or territory . 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). Some states have lower limits for trucks and at night, and occasionally there are minimum speed limits . Most speed limits are set by state or local statute, although each state allows various subdivisions (counties and municipalities) to set a different, generally lower, limit . </P> <P> The highest speed limits are generally 70 mph (113 km / h) on the West Coast and the inland eastern states, 75--80 mph (121--129 km / h) in inland western states, along with Arkansas and Louisiana, and 65--70 mph (105--113 km / h) on the Eastern Seaboard . Alaska, Connecticut, Delaware, Massachusetts, New Jersey, New York, Puerto Rico, Rhode Island, and Vermont have a maximum limit of 65 mph (105 km / h), and Hawaii has a maximum limit of 60 mph (97 km / h). The District of Columbia and the U.S. Virgin Islands have a maximum speed limit of 55 mph (89 km / h). Guam, the Northern Mariana Islands and American Samoa have speed limits of 45 mph (72 km / h). 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 . Unusual for any state east of the Mississippi River, much of I - 95 in Maine north of Bangor allows up to 75 mph (121 km / h), and the same is true for up to 600 miles of freeways in Michigan . Portions of the Idaho, Montana, Nevada, South Dakota, Texas, Utah, and Wyoming road networks have 80 mph (129 km / h) posted limits . The highest posted speed limit in the entire country can be found on the Texas State Highway 130, and it is 85 mph (137 km / h). </P> <P> For 13 years (January 1974--April 1987), federal law withheld Federal highway trust funds to states that had speed limits above 55 mph (89 km / h). From April 1987 through December 8, 1995, an amended federal law disincentivized speed limits above 65 mph (105 km / h). </P>

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