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In roughly a 50-mile (80 km) radius of the Houston–Galveston and Dallas–Ft. Worth regions, the Texas Commission on Environmental Quality convinced [198] the Texas Department of Transportation to reduce the speed limit on all roads with 70 or 65 mph (113 or 105 km/h) speed limits by 5 mph. [199] This was instituted as part of a plan to ...
Portions of the Idaho, Montana, Nevada, Oklahoma, South Dakota, Texas, Utah, and Wyoming road networks have 80 mph (129 km/h) posted limits. 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.