Orbit I-29 speed limit in South Dakota
Mostly 80 mph: about 93% of I-29 in South Dakota is posted at 80. Limits run from 65 to 80 mph along the way. Through cities and towns it is mostly 65 mph.
How much of I-29 is at each limit
Open road
Mostly 80 mph
Through cities and towns
Mostly 65 mph
Questions
What is the speed limit on I-29 in South Dakota?
Mostly 80 mph: about 93% of I-29 in South Dakota is posted at 80. Limits run from 65 to 80 mph along the way. Through cities and towns it is mostly 65 mph.
What is the highest speed limit on I-29 in South Dakota?
80 mph, on 93% of its length in South Dakota.
Can the limit be lower than this?
Yes. Work zones, bad weather and local signs can set a lower limit. The posted sign is always the limit.
How does Orbit know the limit?
Orbit uses state and federal road data and OpenStreetMap, and drivers confirm limits from the road. In the app, the limit for the road you are on shows on the map and in CarPlay.
Posted limits as of October 2026, from state and federal road data and © OpenStreetMap contributors, measured by length of road. Work zones, weather and signs can set a lower limit; always follow the posted sign.