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Aim higher, reach further. Get the Wall Street Journal $12 for 12 weeks. Cruising at 85 mph: Texas Opens Fastest Highway in U.S. Texas opened a 41-mile stretch of State Highway 130 today with a new speed limit of 85 miles per hour â the highest legal limit in the U.S.
Portions of the Idaho, Montana, South Dakota, Texas, Utah, and Wyoming road networks have 80 mph (129 km/h) limits. The highest posted speed limit in the entire country can be found in one single stretch of rural freeway in Texas, and it is 85 mph (137 km/h). For 13 years (January 1974âApril 1987), federal law prohibited speed limits above 55 mph (89 km/h).