Iowa Truck Speed Limit
No split in Iowa. Trucks run the same 70 as cars on rural interstates (Iowa Code 321.285). Off the interstate, primary highways drop to 65 and paved secondary roads to 55. There is no separate, lower truck limit to track.
How fast a truck can run in Iowa
No split in Iowa. Trucks run the same 70 as cars on rural interstates (Iowa Code 321.285). Off the interstate, primary highways drop to 65 and paved secondary roads to 55. There is no separate, lower truck limit to track.
Truck-specific rules and quirks
- Iowa posts 70 on rural interstates for all vehicles, with no truck split. Primary highways run 65 and paved secondary roads 55.
What a speeding ticket costs
Speeding is a graduated scheduled fine. Fines double in a road-work zone.
Iowa Truck Speed Limit FAQ
What is the truck speed limit in Iowa?
Do trucks have a lower speed limit than cars in Iowa?
What is the speeding penalty for a truck in Iowa?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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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