Missouri Raises Interstate Limits to 75 Mph

MoDOT has identified interstate segments in Missouri where the maximum speed limit will rise to 75 mph under a new state law.

Updated on Nov. 4, 2026 in Motorsports

Isometric editorial illustration of a straight interstate highway crossing flat prairie, a bare overhead sign gantry in the distance, evoking Missouri's new higher speed limits. — Missouri will raise speed limits to 75 mph on specific interstate segments near the Iowa border this fall, with MoDOT monitoring crash data and possibly lowering limits to 70 mph. AI Illustration. Upload story photo >

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The Missouri Department of Transportation announced the interstate segments where speed limits will increase to 75 mph following a new state law allowing higher rural highway limits. Crews will update posted signs along the affected stretches this fall.

Why it matters

The change applies a new statewide authority to specific high-volume corridors that connect Missouri with neighboring states. Drivers on these segments will face a higher posted limit, and MoDOT says it will monitor crash data and may lower the limit to 70 mph if needed.

The identified segments include I-29 at 64 miles and I-35 at 55 miles, with additional stretches on I-49 and I-55 totaling several hundred miles. MoDOT's review weighed traffic volume, truck traffic, speed data, crash history, terrain, road design, border-state limits, and active construction.

The players

Missouri Department of Transportation (MoDOT)

The state agency responsible for maintaining Missouri's highway system, which conducted the review and will update the posted speed limits.

The details

MoDOT conducted a detailed review of each eligible location before selecting the segments. The I-29 stretch runs from Exit 56 in Andrew County to about 2.5 miles south of the Iowa border, while the I-35 stretch runs from the northern Cameron city limit to about 4 miles south of the Iowa border.

November 4, 2026: MoDOT announces the interstate segments for the 75 mph increase.
Fall 2026: MoDOT crews update posted speed limit signs along the affected stretches.

Roadmap

The designations follow the state law that set a new 75 mph ceiling for rural highways in Missouri. The corridors chosen connect the state with Iowa, Arkansas, and other neighboring states, shaping how the higher limit applies to through traffic.

Drivers on the identified interstate segments will see posted limits rise to 75 mph once signs are updated this fall. They must continue to obey all posted speed limits on these highways.

The takeaway

Drivers on the designated Missouri interstates should watch for updated signs this fall and keep to the posted limit, since MoDOT may lower the speed to 70 mph if crash data warrants it.

What happens next

MoDOT crews will update posted speed limit signs on the identified interstate segments this fall, and the agency will monitor crash data to determine whether any segment should revert to 70 mph.