Tractor-trailers serve the warehouses and distribution centers around Palmetto and south Fulton County every day. Many of them pull across Highway 29 or swing into loading docks with their trailers stretched across traffic. When a car strikes the side of a trailer, it can slide underneath. A side underride accident is among the deadliest crashes on the road. This article explains why these crashes are so dangerous, what federal law does and does not require, and why victims need a lawyer quickly.
What Is a Side Underride Accident?
A side underride happens when a passenger vehicle hits the side of a trailer and slides beneath it. Trailers sit high off the ground, so the gap lines up with a car’s windshield. As a result, the trailer can strike the passenger compartment directly.
That impact bypasses many of a car’s safety systems. Bumpers and crumple zones sit below the trailer’s edge. Consequently, they may never absorb the force, and airbags may not deploy as designed. Survivors often face severe head, neck, and spinal injuries.
Speak with a Charlotte car accident lawyer and get a free consultation today.
Call (980) 246-2656Does Federal Law Require Side Underride Guards?
No. Federal rules require rear guards on most trailers, but no federal rule requires side guards. In 2021, Congress directed NHTSA to research side underride protection. The agency then opened rulemaking in 2023, yet it had not issued a final rule as of 2026.
Pressure continues to build, however. A federal advisory committee urged NHTSA in 2024 to rethink its cost analysis. In addition, members of Congress introduced the Stop Underrides Act 2.0 in February 2026. That bill would require NHTSA to finish a side guard rule.
Some carriers install side guards voluntarily. Still, a missing side guard usually breaks no federal rule today.
Who Is Responsible for a Side Underride Accident?
Because side guards are optional, these claims usually focus on how the trailer ended up blocking the road. Several parties may share the blame:
- Truck driver: for pulling across traffic without enough time or room
- Trucking company: for poor training, unsafe routes, or pressure to rush deliveries
- Shipper or warehouse: for site layouts that force trucks to back in across a highway
- Trailer owner: for missing or dirty reflective tape and broken lights
- Manufacturer: in some cases, for a design that ignored a safer, feasible option
Georgia law requires drivers turning left or entering a highway from a driveway to yield to oncoming traffic. A tractor-trailer needs far more time to clear the road than a car. Therefore, a driver who misjudges that gap may bear responsibility for the crash.
Why Visibility Often Decides These Cases
Many side underride crashes happen at night or in low light. A dark trailer stretched across the road can look like empty space to an approaching driver. For that reason, federal rules require most trailers to carry reflective tape along their sides. Drivers who stop on the road must also use hazard flashers and warning triangles.
These rules carry real weight in a claim. Faded or missing tape, burned-out lights, or a skipped warning can show the trucking company failed to protect other drivers. Additionally, the trucking company may try to blame the car’s driver for not seeing the trailer. Strong visibility evidence answers that defense.
Why Evidence Disappears Fast
Proving what happened takes quick action. Engine data can show when the truck began its turn and how fast it moved. Meanwhile, dash cameras, warehouse cameras, and nearby business video may capture the crash itself. The trailer’s lights and reflective tape also need inspection before anyone repairs them.
Unfortunately, carriers can overwrite video and discard some records within months. Georgia generally allows two years to file an injury lawsuit. Even so, your lawyer should demand that the trucking company preserve the trailer, the truck, and its records right away.
Why Hire a Truck Accident Lawyer After a Side Underride Crash?
Trucking companies and their insurers send investigators to serious crashes within hours. Their goal is to limit what they pay. An experienced attorney can level that playing field with crash reconstruction experts, visibility testing, and the carrier’s own records.
Your legal team can also identify every responsible company, from the carrier to the warehouse. Meanwhile, you can focus on recovery. For more on rear-guard crashes and how underride claims work in general, see our truck underride accident page.
Talk to a Palmetto Truck Accident Lawyer
A side underride accident can change a family’s life in an instant. You deserve to know why the trailer was in your path and who is responsible. At Shane Smith Law, our team moves quickly to preserve the evidence that answers those questions. Call 980-982-2329 today for a free consultation with a Palmetto truck accident lawyer.
