They usually indicate, but not always, statutory speed limits. The values shown are not necessarily the fastest or slowest. This table contains the most usual posted daytime speed limits, in miles per hour, on typical roads in each category. Speed limit sign at a school zone with a warning light Overview Speed limits From April 1987 to December 8, 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. 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). Office of Defense Transportation established a national 35 mph "Victory Speed Limit" (also known as "War Speed") to conserve gasoline and rubber for the American war effort, from May 1942 to August 1945, when the war ended. The highest posted speed limit in the country is 85 mph (137 km/h) and can be found only on Texas State Highway 130, a toll road that bypasses the Austin metropolitan area for long-distance traffic.Ī standard sign indicating a speed limit of 80 mph (129 km/h), a night-time speed limit of 65 mph (105 km/h), and a truck speed limit of 55 mph (89 km/h)ĭuring World War II, the U.S. Portions of the Idaho, Montana, Nevada, Oklahoma, South Dakota, Texas, Utah, and Wyoming road networks have 80 mph (129 km/h) posted limits. Unusual for any state east of the Mississippi River, much of Interstate 95 (I-95) in Maine north of Bangor allows up to 75 mph (121 km/h), and the same is true for up to 600 mi (966 km) of freeways in Michigan. 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. American Samoa has a maximum speed limit of 30 mph (48 km/h). Guam and the Northern Mariana Islands have speed limits of 45 mph (72 km/h). Virgin Islands have a maximum speed limit of 55 mph (89 km/h). 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 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, Louisiana, Maine, and Michigan and 65–70 mph (105–113 km/h) on the Eastern Seaboard. Some states have lower limits for trucks, some also have night and/or minimum speed limits. Speed limits are typically posted in increments of five miles per hour (8 km/h). 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). States have also allowed counties and municipalities to enact typically lower limits. In the United States, speed limits are set by each state or territory. Main articles: Speed limit and Speed limits by country Map of highest posted speed limits in US states or counties Map of highest posted speed limits in the U.S.
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