Orbit I-129 speed limit in Iowa
55 mphUsual limit
Mostly 55 mph: about 100% of I-129 in Iowa is posted at 55.
How much of I-129 is at each limit
Questions
What is the speed limit on I-129 in Iowa?
Mostly 55 mph: about 100% of I-129 in Iowa is posted at 55.
What is the highest speed limit on I-129 in Iowa?
55 mph, on 100% of its length in Iowa.
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.
Other Interstates in Iowa
I-129 in other states
Orbit shows the limit for the road you're on · coming soon to iPhone and CarPlaySee Orbit SI