The 18-wheeler jackknifed. Who is responsible?

A jackknife is not an accident of physics

An 18-wheeler jackknifes when the tractor and the trailer stop moving as one. The drive wheels or the trailer wheels lose traction, the trailer keeps going, and it swings out and folds toward the cab like a closing pocketknife. A jackknifed semi can sweep across every lane of a highway and leave nowhere for the cars around it to go.

Trucking companies like to describe these crashes as something that happened to the truck: the road was wet, a car cut in, the load shifted. But a tractor-trailer rarely jackknifes at a safe speed with working brakes and a properly secured load. Usually something went wrong, and in most cases it was within someone’s control.

The usual causes

Speed for the conditions, especially entering a curve, a ramp or a downhill.

Hard or panic braking, which is often the result of following too closely or not watching the road far enough ahead.

Brake problems: brakes out of adjustment, worn, or unevenly applied between tractor and trailer, so one locks before the other.

Light or empty trailers, which have less weight over the wheels and lose traction more easily.

Improperly loaded or secured cargo that shifts in a turn or under braking.

Fatigue, which slows reaction time until the only option left is slamming the brakes.

“It was raining” is not a defense

Weather is the first explanation a carrier gives for a jackknife, and federal law has already answered it. The Federal Motor Carrier Safety Regulations require a commercial driver to use extreme caution in rain, fog, ice, smoke or anything else that reduces visibility or traction, to reduce speed when those conditions exist, and to stop driving if they become dangerous enough. A professional driver on a wet Houston freeway is expected to drive for the wet freeway. Losing control in the rain is usually evidence of the violation, not an excuse for it.

Who can be responsible

A jackknife case is rarely just about the driver.

The motor carrier is responsible for its driver’s conduct on the job, and separately for its own decisions: who it hired and trained, how it scheduled the run, and whether it inspected, repaired and maintained the equipment the way federal rules require. If the brakes were out of adjustment, the maintenance records — which the carrier must keep for one year, and six months after the vehicle leaves its control — are where that shows up.

The shipper or loader may be responsible if the cargo was loaded or secured in a way that caused it to shift. A maintenance shop that worked on the brakes, the owner of the trailer if it is different from the carrier, and in some cases the manufacturer of a defective brake or stability component can all be part of the case. Each of them may have its own insurance, which is often what makes a full recovery possible.

The evidence that proves it, and how long it lasts

Most modern tractors’ engine control modules can record speed, braking and throttle around a hard stop or a crash, depending on the manufacturer. Many carriers also run forward-facing and driver-facing cameras and GPS telematics. The electronic logging device shows how long the driver had been on duty. Together, those can show how fast the truck was going and when the brakes were applied.

They can also disappear. Duty-status records have to be kept for only six months. Camera systems often record over themselves in days. Engine data can be lost the moment the tractor is repaired and put back on the road. The way to stop that is a preservation letter, sent to every company involved as early as possible, followed by a joint inspection of the truck before anyone touches it.

Authority: 49 CFR 392.14 (hazardous conditions; extreme caution) · 49 CFR 396.3 (inspection, repair and maintenance) · 49 CFR 395.8 (records of duty status; retention)