South Dakota Truck Speed Limit
No split in South Dakota. Trucks run the full posted limit, and rural interstates have sat at 80 since 2015 (S.D.C.L. 32-25-4). A governed truck capped at 65-68 will be the slow vehicle here, so stay right and let cars go.
How fast a truck can run in South Dakota
No split in South Dakota. Trucks run the full posted limit, and rural interstates have sat at 80 since 2015 (S.D.C.L. 32-25-4). A governed truck capped at 65-68 will be the slow vehicle here, so stay right and let cars go.
Truck-specific rules and quirks
- South Dakota raised rural interstates to 80 in 2015, and trucks run it too. A fleet governor set at 65-68 will keep you well under.
What a speeding ticket costs
Speeding is a graduated fine set by the court. Work-zone fines increase.
South Dakota Truck Speed Limit FAQ
What is the truck speed limit in South Dakota?
Do trucks have a lower speed limit than cars in South Dakota?
What is the speeding penalty for a truck in South Dakota?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.iihs.org/topics/speed/speed-limit-laws. See our Terms & Disclaimer.
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