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Police say a serious crash occurred on Friday, September 19, 2025, along northbound US 23 near Pontiac Trail. According to reports, a semi-truck traveling southbound allegedly crossed the median and collided with three vehicles in the northbound lanes. A 49-year-old woman from Plymouth was killed, while several others sustained minor injuries. Investigators have not yet determined why the semi-truck crossed over.

When I read about a crash like this, my first thought is how unusual it is for a commercial truck to allegedly leave its lane entirely and cross a divided highway. That kind of movement raises important questions about the driver’s condition and the vehicle’s mechanical state.

Could Fatigue or Distraction Have Played a Role?

Semi-truck drivers often operate on demanding schedules, and fatigue is a frequent concern in early morning or late evening crashes. If the driver was drowsy or lost focus even momentarily, the truck could have drifted off course. Investigators may review the driver’s logbooks, electronic logging device (ELD) data, and work schedule to see if hours-of-service rules were followed. Cell phone records and in-cab camera footage may also help rule out distraction.

Could a Mechanical Issue Explain the Median Crossover?

Another area of investigation is whether a mechanical problem caused the semi-truck to leave its lane. Brake failures, steering malfunctions, or a tire blowout can all cause a driver to lose control. Inspecting the truck’s systems and reviewing its maintenance records will be key to determining if a defect or neglected repair contributed to the crash.

What Evidence Will Investigators Need?

Engine Control Module (ECM) data from the semi-truck can reveal speed, braking, and throttle position leading up to the collision. Physical evidence such as skid marks, gouge marks, and vehicle resting positions will help reconstruct the sequence of events. Investigators will also want to gather witness statements and review any available traffic camera footage to piece together how and why the truck crossed the median.

Why Careful Investigation Matters

With a fatality and multiple vehicles involved, it’s essential that investigators fully explore whether driver fatigue, distraction, or mechanical issues were contributing factors. Those findings will provide much-needed answers about how this crash happened and help ensure that accountability is assigned where necessary.