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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.
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). For 13 years (January 1974âApril 1987), federal law withheld Federal highway trust funds to states that had speed limits above 55 mph (89 km/h).