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What Is The Speed Limit On I 90 In South Dakota? [Solved]

South Dakota has a series of speed limits depending on your location. The speed limit on Interstate 29 and Interstate 90 is 75 mph for cars or trucks, day or night, with a minimum speed of 40 mph. All South Dakota secondary highways are 65 mph, unless otherwise posted.

Driving on I90 across South Dakota from Wall to Sioux Falls

There are short concurrencies with

South Dakota Interstate Speed Limit

Yep you weren’t seeing things, 80 mph!

I-90 South Dakota

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