A Look at the Tractor-Trailer Crash on I-35 in La Salle County, TX

Michael GrossmanSeptember 24, 2025 2 minutes

A crash on Interstate 35 in La Salle County left at least one person dead on Monday afternoon. According to investigators, a Ford pickup allegedly collided with the back of a tractor-trailer, and both vehicles caught fire. The semi driver was treated for minor injuries, but due to the fire damage, it’s still unclear how many people were inside the pickup.

When vehicles burn this extensively, it’s not always easy to determine what caused the collision. If a crash leads to this kind of fire, investigators need to look beyond the initial collision. It’s possible that fuel system components or other mechanical issues contributed to how quickly the fire spread.

Could a Defect in the Fuel System Have Contributed?

One line of inquiry is whether the pickup or the tractor-trailer had defects in the fuel lines, tanks, or related components. A ruptured or poorly protected fuel line can turn an otherwise survivable collision into a fatal one if gasoline or diesel ignites. Similarly, the placement and protection of fuel tanks on large trucks are critical factors in determining whether a crash results in a fire. Investigators may need to determine whether either vehicle had a history of recalls or safety advisories involving its fuel system.

What Other Mechanical Factors Should Be Considered?

Investigators will likely examine whether the pickup’s braking or steering systems failed prior to impact, but the post-crash fire raises additional concerns. Beyond fuel lines, electrical shorts, compromised battery systems, or even overheated braking components can all contribute to ignition after a collision. Maintenance and inspection logs from both vehicles could help identify whether issues were noted but not corrected.

What Evidence Will Be Important?

Even though much of the physical evidence was destroyed, some key information may still be available. The tractor-trailer’s Engine Control Module (ECM) could provide insight into vehicle speed and braking before the crash. Investigators may also turn to surveillance cameras or witness statements to understand how the vehicles were moving before impact. Any fragments of the burned vehicles that remain intact, particularly fuel system components, could be crucial to determining whether a defect played a role.

Why These Questions Matter

Due to the severity of this crash, it’s not enough to say this was simply a rear-end collision. Investigators need to carefully consider whether defective equipment, especially in the vehicles’ fuel systems, made the crash far worse than it might otherwise have been. Those answers are essential for accountability and for understanding exactly how this fatal fire occurred.