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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.
âUp until the 1970s, at least in the U.S., interstate highway speed limits were quite high. They were set at 70 to 75 miles per hour [112 km/h to 120 km/h]. Thatâs what those roads were designed for in the 1950s,â. In the mid-â70s, the energy crisis prompted a slowdown across North America, including Canada, where it coincided with a switch to metric. âThey passed a national maximum speed limit, which was 55 mph and that was done for fuel conservation purposes. Not because there were safety concerns.