Write Up:

Compared to the fourth quarter of 2024, average travel times in the fourth quarter of 2025 increased during three of the four studied peak periods. In the St. Louis region, average travel times rose by 10 seconds during the morning peak and decreased by one second during the evening peak. In the Kansas City region, average travel times increased by 15 seconds during the morning peak and by six seconds during the evening peak. Average speeds across both regions and peak periods ranged from 55 to 59 mph. None of the four peaks fell below the average travel time target.

Planning time accounts for unexpected delays and indicates how much time customers should plan for their trip to arrive on time 95% of the time. In St. Louis, motorists traveling during the morning rush needed to plan an additional three minutes and seven seconds for a 10-mile trip compared to free-flow conditions. During the evening rush, customers needed to plan for an additional five minutes and 21 seconds. In Kansas City, motorists traveling during the morning rush needed to plan an additional two minutes and 50 seconds for a 10-mile trip compared to free-flow conditions. During the evening rush, customers needed to plan for an additional four minutes and 37 seconds. Planning times for the fourth quarter of 2025, compared to the fourth quarter of 2024, increased across three of the four studied peaks (with the St. Louis evening peak decreasing). Planning times for both regions represent average rush-hour speeds between 39 and 47 mph.

Purpose of the Measure:

This measure tracks the mobility of significant state routes in St. Louis, Kansas City, Springfield and Columbia.

Measurement and Data Collection:

Travel time data is collected continuously via wireless technology. To assess mobility, MoDOT compares travel times during rush hour to free-flow conditions where vehicles can travel at the posted speed limit. This measure also assesses reliability, an indicator of how variable those travel times are daily.

The charts in this measure show the average travel time and the 95th percentile travel time, which is the time motorists should plan to reach their destinations timely 95% of the time.

The maps display the reliability of specific sections of roadways during rush hour.

The targets for average travel time are updated quarterly. The targets are established by projecting a 10% improvement over the average travel time of the same quarter over the previous two years. The minimum value for the target time is 10 minutes. This corresponds to the time it takes to travel 10 miles at the posted speed limit of 60 miles per hour.