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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.
The speed limit in South Dakota is 80 miles per hour (129 km/h) on rural interstates, regardless of vehicle type and time of day, [13] and 65 mph (105 km/h) on urban interstates and other highways, or up to 70 mph (113 km/h) on multilane, divided non-interstate roadways.
Nearly 90% of this route is designated to become part of I-69 in the future. Currently, 75 mph (120 km/h) speed limits are allowed on US 59 in Duval County and portions of northern Polk County. In Texas, U.S. Route 59 is known as the Lloyd Bentsen Highway for the U.S. senator (1971-1993) and the Democratic vice-presidential nominee (1988).
Since April 2015, the speed limit is 80 mph (130 km/h) between the Rapid City and the Minnesota state line, except for the segment between Veterans Parkway and Marion Road in Sioux Falls, where the speed limit is 65 mph (105 km/h). The speed limit remains 75 mph (121 km/h) between Rapid City and the Wyoming state line.
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The first freeway in Texas was a several-mile stretch of US 75 (now I-45)—The Gulf Freeway—opened to Houston traffic on October 1, 1948. The stretch of US 75 between I-30 and the Oklahoma state line has exits numbered consecutively from 1 to 75 (with occasional A and B designations), excluding 9-19.