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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.
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.
The speed limit on I-29 in South Dakota is 80 mph (130 km/h) on most segments, but 65 mph (105 km/h) in Dakota Dunes and North Sioux City from the Iowa state line to exit 4, in Tea from exit 73 to exit 75, and in Sioux Falls from exit 75 to exit 84.
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.
In Tripp County, the highways turn south and then back to the east, forming the northern limit of Witten. East of Witten, SD 44 and SD 53 intersect US 183, and the three routes run south for about four miles (6.4 km) before meeting US 18. At this intersection, SD 53 splits to the west, while SD 44 turns east with US 18 and US 183. [4]
Shortly after the December 1995 repeal of the 65/55 mph National Maximum Speed Law, South Dakota raised its general rural speed limits to 75 mph (121 km/h) on freeways and 65 mph (105 km/h) on other roads along with 70 mph (113 km/h) on a few 4 lane divided highways. Almost a decade after posting the 75 mph limit, average speeds on South ...
The speed limit from Aberdeen to I-29 is 70 mph (110 km/h) except through the communities of Groton, Webster, and Waubay. From there, it heads southeast 22 miles (35 km) until Milbank . At Milbank, it continues east for 12 miles (19 km), until it crosses into Minnesota at Big Stone City , just south of Big Stone Lake .
I-29 at the Iowa state line at Dakota Dunes: I-29 / US 81 at the North Dakota state line north-northwest of Victor: 1958: current I-90: 412.76: 664.27 I-90 at the Wyoming state line west-northwest of North Spearfish: I-90 at the Minnesota state line north-northeast of Valley Springs — — I-190: 1.72: 2.77 US 16 / SD 44 / West Boulevard in ...