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Freeways in Michigan are usually signed with both minimum and maximum speeds. By default, the freeway speed limit is 70 mph (113 km/h), with a minimum speed of 55 mph (89 km/h) for all vehicles, despite a truck speed limit of 65 mph (105 km/h)—effectively permitting trucks only a 10 mph (16 km/h) range of legal speeds. [83]
In January 2009, the speed limit on two sections of I-15 together totaling 34 miles (55 km) was raised to 80 mph (130 km/h) as a "test", making Utah the second state to currently have speed limits greater than 75 mph (121 km/h).
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 highest speed limit for undivided roads is 75 mph (121 km/h) in Texas. Undivided road speed limits vary greatly by state.
U.S. Route 6 (US-6) is an east–west United States Numbered Highway through the central part of the U.S. state of Utah.Although it is only about 40 miles (64 km) longer than US-50, it serves more populated areas and, in fact, follows what had been US-50's routing until it was moved to follow Interstate 70 (I-70) in 1976.
State Route 201 (SR-201) is an east–west expressway and freeway located in Salt Lake County in the U.S. state of Utah.Colloquially known by some as the 21st South Freeway, [2] the route serves as an alternative to Interstate 80 (I-80) through Salt Lake City.
State Route 71 (SR-71) is a state highway completely within the Salt Lake City metropolitan area in the northern portion of the US state of Utah.It runs from SR-154 in the southwest side of the city to SR-186 in Downtown Salt Lake City.
U.S. Route 89 (US 89) in the U.S. state of Utah is a north-south United States Highway spanning more than 502 miles (807.891 km) through the central part of the state, making it the longest road in Utah.
The speed limit on the parallel I-15 is 70 mph (110 km/h); however speeds in the leftmost lane can reach upwards of 80 mph (130 km/h). [19] Original plans for the highway had included a six-lane expressway, [20] compared to the four-lane controlled-access parkway that was built. [21]