Witnesses later described a deafening impact followed by an eerie silence, broken only by cries for help and the wail of approaching ambulances.

The trailer, unable to stop in time, had plowed into several vehicles before coming to rest sideways, sealing off the northbound lanes like a barricade.

Some drivers escaped their cars in shock, others remained trapped, waiting for rescuers to reach them through the maze of debris.

Authorities rushed to the scene, coordinating paramedics, firefighters, and tow units to clear the highway and attend to the injured. Traffic stretched for kilometers as families called loved ones, desperate for news. Investigators are now working to determine whether mechanical failure, speed, or human error triggered the collision. On an ordinary Wednesday in Huehuetoca, a few fatal seconds reminded everyone how fragile the line is between routine and catastrophe.