Police in Pueblo, Colorado say the driver of a truck traveling the wrong way on Interstate 25 likely suffered a seizure just before triggering a six-vehicle crash during the Tuesday evening rush hour.
Isaiah Mascarenas caught the violent crash on camera and shared the video online.
The truck, hauling a flatbed, sped toward a car and van traveling in the opposite direction. That set up the chain reaction that followed, eventually involving three other vehicles.
Police said witnesses saw the truck driver in convulsions immediately prior to the collisions. That driver was one of two hospitalized for treatment.
The only other reported injury was a child in one of the cars who was treated for a minor cut.
Traffic was shut down for nearly three-and-a-half hours.