Missouri to Raise Interstate Speed Limits to 75 MPH
The Missouri Department of Transportation will increase limits on four major interstates this fall.
Updated on Oct. 21, 2026 in Motorsports
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Starting in the fall of 2026, the Missouri Department of Transportation will raise the maximum speed limit to 75 mph on designated stretches of four major interstates. The decision follows a state law authorizing speed increases on rural highway segments.
Why it matters
The department aims to improve traffic efficiency while maintaining roadway safety standards. To determine which segments qualified for the change, officials reviewed traffic volume, crash history, truck usage, and road design.
The speed limit increase will affect 64 miles of I-29, 55 miles of I-35, 69 miles of I-49, and 137 miles of I-55. The previous maximum speed allowed on these rural stretches was 70 mph.
The players
Missouri Department of Transportation
This state agency is responsible for the design, construction, and maintenance of Missouri's transportation infrastructure and highway system.
The details
MoDOT crews are scheduled to begin updating posted signage across the designated highway segments this fall. The changes are limited to specific rural stretches identified through an exhaustive internal review of terrain and infrastructure capabilities.
Timeline
October 21, 2026: The Missouri Department of Transportation formally announced the planned speed limit increases.
Fall 2026: The 75 mph speed limits take effect.
Roadmap
Missouri's decision mirrors a broader national trend where states adjust rural highway limits to reflect modern vehicle capabilities and traffic flow. This alignment positions Missouri among a growing list of states seeking to balance transit efficiency with local infrastructure design.
Drivers should prepare for higher travel speeds and must watch for updated signage along designated segments of I-29, I-35, I-49, and I-55. Commuters and long-haul travelers can expect changes to typical travel times on these routes beginning this fall.
The takeaway
Travelers should remain vigilant for updated signs as the new limits phase in across the state. Adjusting to these higher speeds will be essential for maintaining safe traffic flow on these key interstate corridors.
Further reading
For more on state highway regulations, visit the Missouri Motorsports section.
Live Poll
Do you support increasing the maximum speed limit to 75 mph on your local interstate highways?
