Sunday, September 6, 2026

New Law Authorizes DOT to Raise Rural Interstate Speed Limits

Senate Bill 1408, which permits MoDOT to increase the maximum speed limit up to 75 miles per hour on rural interstates, went into effect Aug. 28, but no changes to the speed limit have been made while the department evaluates eligible locations.

Under the new law, MoDOT retains the ability to set highway speed limits and has a responsibility to set limits that are reasonably safe considering the various factors of each roadway. MoDOT aims to complete its evaluations by the end of the year.

The factors being evaluated at each eligible location include:

Passenger vehicle and commercial truck traffic volumes.

Crash history.

Terrain and road design, including existing safety countermeasures.

Existing speed limits of border states in eligible areas near the state line.

Active construction.

Interstate 70’s speed limit will not increase during the historic rebuild and expansion delivered through the Improve I-70 Program. MoDOT will reevaluate this corridor after the program's completion.

As the evaluation is underway, MoDOT reminds drivers to always obey posted speed limits for everyone's safety, especially in the hundreds of work zones across the state that have reduced speed limits.


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