Laws and Licenses
The speed limit in South Dakota is 75 miles per hour (121 km/h) on rural interstates, regardless of vehicle type and time of day, and 65 mph (105 km/h) on urban interstates and other highways.
South Dakota license plates are numbered with the first digit referring to the county of origin. Counties 1–9 are ranked by 1950 population, and counties 10–64 are numbered alphabetically.
Studded tires are permitted to be used from October 1 to April 30, except on school buses and fire vehicles which are permitted year round.
Read more about this topic: Transportation In South Dakota
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