Des Moines, Iowa – Governor Kim Reynolds signed Senate File 378 (SF 378) into law on June 1, 2026, increasing Iowa’s default speed limit on most two-lane rural highways from 55 mph to 60 mph. The change takes effect July 1, 2026. 

The legislation updates an outdated limit that had remained in place for decades. Modern vehicles with improved safety features prompted the adjustment, which aligns Iowa more closely with neighboring states. 

Key Details for Drivers

•  Applies to undivided two-lane state highways and rural roads.

•  Does not affect interstates (still 70 mph) or urban areas.

•  State and local agencies will apply temporary stickers to existing signs until permanent updates are installed. 

The bill also modifies minor speeding violation thresholds to reduce unnecessary penalties for slight overages under the new limit.

Impacts and Reactions

Rural drivers, farmers, and truckers are expected to benefit from shorter travel times on long stretches of highway. On a 50-mile trip, the extra 5 mph could save about 3–4 minutes.

Safety advocates raised concerns about increased risks on curvy roads, especially during bad weather or near slow farm equipment. Proponents countered that today’s cars handle higher speeds more safely than older models. 

The governor signed the measure alongside 16 other bills addressing topics like water infrastructure, education, and tax incentives. 

This modest increase reflects a national trend of states updating traffic rules to match current technology and driving habits. Officials will monitor crash data in the coming months to assess results.