Learning about the causes of commercial vehicle accidents is not only the responsibility of the trucking company or safety inspectors. It’s important to anyone who drives on the road with 18 wheelers, delivery vans or dump trucks. Let’s face it, that’s everyone.

In recent years, the U.S. has seen a consistently rising number of large truck and bus crashes over the past ten years. While a great number of people blame “bad truck drivers”, there is much more to the story. There are years of accident investigation and discussions with fleet safety officers, and the fact is that most collisions are caused by a combination of human error, poor planning and equipment neglect.

Let’s examine the most common causes of commercial vehicle accidents. You will learn the facts of why things go wrong, why they go wrong, and how all of you can fight for safer highways.

What Are the Most Common Causes of Commercial Vehicle Accidents?

One big reason may be expected to account for most crashes. But it’s more of a mesh of intertwining factors. I have compiled a list of the most common triggers to appear in FMCSA data and claims below.

Driver Fatigue and Long Hours on the Road

Many drivers are required to continue pushing forward long after delivery time and tight schedules have been met. Despite Hours-of-Service regulations, fatigue is still a major cause of commercial vehicle accidents. Tired drivers will take longer to respond to a situation, fail to see what is going on, and may even microsleep for a few frightening seconds.

Think about it. A car driver dozing off might drift into a shoulder. A truck driver dozing off can barrel through an entire intersection or crush a smaller vehicle before they ever hit the brakes.

Numerous fleets now have electronic logging devices (ELDs) in place, but they aren’t stopping the fatigue. Even with modern equipment, drivers still begin journeys already weary from an inadequate night’s rest at home or from being on duty around the clock on their day off last week.

Distracted Driving Behind the Wheel

People don’t talk about the distraction while driving a commercial vehicle often enough, but it’s not just about texting. Drivers turn their heads to the side using complicated GPS navigation devices, complete paperwork logs, eat meals or play with in-cab entertainment systems. Some even view videos during long straight periods.

This is what most people will find surprising. Distraction is one of the top causes of commercial vehicle accidents, after fatigue, and is often ignored during safety training. At 55mph, a driver’s eyes are closed for four seconds and they travel the length of a football field without knowing. No time to react if traffic suddenly stops or a car cuts in front.

Poor Vehicle Maintenance and Brake Failures

When finances are tight, trucking companies will prioritize maintenance as soon as possible. There’s a ticking time bomb on wheels from worn brake pads, under inflated tires and substandard lighting equipment.

Approximately 30% of large truck accidents are brake related. If a rig must stop in 40% less time than a car, any brake imbalance or loss of air will make stopping near impossible. I have seen inspection reports of six out of ten of the trailer’s brakes on one vehicle were totally unusable. Mechanical issues which a driver never knew about cannot be remedied by the driver.

Improper Loading and Cargo Shifts

The unbalanced or unsecured load makes an unbalanced truck a rolling disaster! If cargo moves around during sharp turns or sudden stops, this will cause the vehicle’s center of gravity to change in an instant. The driver loses control and there is a risk of jackknifing and/or rolling the trailer.

Shippers rush to load the ship to meet the schedules and occasionally do not adhere to weight distribution rules. A frequent error is loading the object on only one side. One is not securing it with adequate straps or chains. One day a driver is driving and encounters a pothole or rolls onto a highway ramp, only to see the trailer tip over, along with other vehicles.

Aggressive Driving and Speed

It is a huge pressure for commercial drivers to provide timely deliveries. Others react to this in the following ways: tailgating, weaving, and speeding even on the roadways of a work zone. These habits are deadly because they are massive in size. It may be impolite for a car to run off a truck, but the truck driver tailgating that car is an extremely dangerous rear end accident situation.

A high speed will greatly increase stopping distance and cause a loss in reaction time. The stopping distance increases by almost 100 feet when a truck exceeds the speed limit from 60 to 70 mph. That difference can spell the difference between a safe stop and a pileup, in wet or icy conditions.

Unfamiliar Roads and Bad Weather Navigation

Many accidents occur when drivers take to local roads they are not familiar with. Even expert drivers can be taken aback by a low clearance bridge, a sharp residential turn, or a steep downgrade. GPS fleet tracking systems frequently lead trucks into impossible situations.

We have the added dimension of weather. Due to their weight and exposed surface area, fog, rain, snow and ice have a more significant impact on trucks. However, many drivers continue to drive at high speeds when the conditions are calling for braking. They don’t care if they fall into a ditch or into oncoming traffic, they worry about missing deadlines.

How Can Fleets and Drivers Reduce These Risks?

Prevention doesn’t have to be a big technology upgrade and/or overhaul. Do little, regular actions. Foster a safe culture where drivers are not penalized for admitting they are tired or a vehicle is not working properly. Pursue continuous training that is based on practical situations rather than videos from orientation week.

Utilize telematics to prevent accidents caused by sudden braking. Track drivers’ working hours with absolute precision—rather than merely as a paper formality. For safety reasons, load cargo into every trailer as if you were seating your own family inside.

Final Thoughts

No one gets up in the morning with the intention of causing a commercial vehicle accident. However, a mixture of rushed work, maintenance neglect and man factors presents a hazardous cocktail. These are the root causes of commercial vehicle accidents, and we can tackle them head on to reduce crash rates. Fleets should no longer view safety as a chore, but rather a competitive tool. Everyday drivers must increase the distance they give trucks, knowing that the large trucks can’t maneuver as quickly as a sedan and can’t stop at a last-minute stop.

Next time you see a semi on the interstate, keep those unseen pressures on that wheel in mind. Saving more than time may require a little patience. It could save a life.

Frequently Asked Questions

Who is liable when a commercial vehicle accident occurs?

Liability often falls on multiple parties. The driver, the trucking company, the maintenance provider, and even the cargo loader can share responsibility. An attorney will look at logbooks, inspection records, and black box data from the truck to determine fault.

Are commercial vehicle accidents more common at night?

Yes, many truck accidents happen between midnight and 6 AM. Fatigue peaks during these hours, visibility drops, and drunk drivers on the road create unpredictable hazards.

What should I do immediately after a truck accident?

Get to a safe location if possible. Call 911. Seek medical attention even for minor pain. Take photos of the truck, license plates, and road conditions. Do not sign anything from the trucking company before talking to a lawyer.

Do weather related crashes count as driver fault?

Sometimes. Drivers must adjust speed and following distance for conditions. If a truck crashes in the rain while traveling at the dry weather speed limit, investigators will likely deem the driver at fault for failing to adapt.