Jefferson County, MO (June 2, 2026) – Two people were injured following a traffic accident at the intersection of westbound Route M and Missouri 21 in Jefferson County.
According to the Missouri State Highway Patrol, the wreck occurred at about 1:43 p.m. on Monday, June 1. Investigators reported that a 2007 GMC Sierra was stopped in the median between the eastbound and westbound lanes of Route M and was preparing to enter northbound Missouri 21. A 2025 Toyota RAV4 was traveling west in the right lane of Route M when the GMC entered its path.
The front of the Toyota struck the right side of the GMC. The 54-year-old woman driving the Toyota was reported to have moderate injuries, while the 73-year-old man operating the GMC sustained serious injuries. Both were taken to Mercy Hospital South for treatment.
The two vehicles received total damage and were removed from the roadway by a towing service. The names of the people involved had not been publicly released at the time of publication.
Investigators are continuing to examine the factors that led to the accident. We send our best wishes to those recovering from their injuries and hope for their full recovery.
Why Failure-to-Yield Crashes Often Occur at Intersections
Failure-to-yield collisions frequently happen when a driver enters or crosses a roadway without allowing enough space for approaching traffic. Intersections, median crossings, and turn lanes can be particularly challenging because motorists must judge vehicle speeds and available gaps before proceeding.
These types of crashes may involve side impacts, which can cause significant vehicle damage because the sides of a vehicle generally provide less protection than the front or rear. Factors such as limited visibility, driver distraction, misjudging distance, or unfamiliarity with an intersection can contribute to these roadway encounters.
Investigators typically review vehicle positions, roadway design, driver statements, and physical evidence to determine how a traffic collision unfolded. Information gathered from these reviews helps create a clearer picture of the sequence of actions leading up to the crash and may assist in identifying contributing factors.
