South Dakota Raises Speed Limit to 80 MPH by: Josh Wolsky | April 2, 2015 Share it via email! × You must be logged in to email a friend! If you’re on the Interstate in South Dakota, you can now drive a little faster — 80 MPH is the new limit. This article was sourced from: Maya Rao, Star Tribune Source Josh Wolsky Editor and Publisher of TheMinotVoice, Developer of the #ForMinot Network, Co-Host of #GoodTalk Minot, Advocate and Friend of the Souris River, Former City Alderman, and clearly -- all things #MakeMinot. Go ahead, don't wait for permission!