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Flattened and Crushed Vehicle Securement: Containment Walls, Tiedowns, and Leak Control
Scrap vehicle stacks combine sharp metal, unstable shapes, loose parts, and retained fluids. Learn how federal tiedown counts change with four, three, two, or no full-height containment sides—and where synthetic webbing is prohibited.
Flattened vehicles are not ordinary vehicle cargo
A crushed automobile, light truck, or van no longer has predictable wheels, suspension, manufacturer transport points, or a stable rectangular profile. Flattening can expose sharp metal, release components, trap fluids, and create irregular stacks that settle under vibration. The securement plan must control the stack as scrap cargo while also preventing liquids and loose parts from escaping. Do not reuse an intact-vehicle wheel-strap plan simply because the cargo began as a vehicle.
Apply Section 393.132 to the correct cargo
49 CFR 393.132 applies to vehicles such as automobiles, light trucks, and vans that have been flattened or crushed. Intact automobiles, light trucks, and vans weighing 10,000 pounds or less are covered by Section 393.128, while certain heavier vehicles and equipment are addressed by Section 393.130. Identify the cargo's actual condition before selecting the rule. A severely damaged vehicle that is not flattened or crushed may require a qualified securement decision rather than an assumption.
Plan the load before the first stack is placed
Obtain reliable weights, dimensions, stack counts, loading order, and a carrier-approved arrangement. Confirm the trailer frame, floor, deck, suspension, axles, tires, walls, sideboards, posts, anchors, and gross ratings can carry both the total load and concentrated stack forces. Account for legal height, width, length, axle distribution, overhead clearance, and the effect of exposed parts. Securement cannot correct an overloaded axle, a weak wall, or a stack that exceeds the permitted envelope.
Control the loading and unloading zone
Use stable, level ground and equipment designed for crushed-vehicle handling. Establish an exclusion zone around grapples, loaders, cranes, suspended material, moving stacks, and trailer sides. Never stand beneath a suspended vehicle, between a stack and a wall, or where settling cargo can trap a person. The driver should verify the completed load from safe positions and should not climb onto unstable scrap or enter the loader's swing and drop zones.
Treat containment and tiedowns as one system
Section 393.132 provides four alternatives based on how many sides have full-height containment capable of blocking movement in the protected directions. As containment decreases, the minimum tiedown count per vehicle stack increases. Select one complete alternative for every stack and verify each wall or comparable means actually performs the required function. A tarp, loose mesh, partial-height rail, or decorative side is not automatically structural containment.
Four full-height sides can provide the complete movement barrier
One permitted arrangement uses containment walls or comparable means on all four sides, extending to the full height of the load and blocking forward, rearward, and lateral movement. The rule does not add a commodity-specific minimum tiedown count to this four-sided alternative. That does not excuse damaged walls, gaps, an over-height stack, inadequate strength, or a load that can escape vertically. Confirm the enclosure and load stay within the approved vehicle design and carrier procedure.
Three full-height sides require two tiedowns per stack
With containment walls or comparable means on three sides, each protected side must extend to the full height of the load and block movement in its direction. Section 393.132 then requires at least two tiedowns for each vehicle stack. Identify the open direction and arrange the restraints to complete the system rather than merely placing two devices wherever anchors are convenient. Every stack needs its own compliant minimum and capacity calculation.
Two full-height sides require three tiedowns per stack
The two-sided option requires containment walls that extend to the full load height and block forward and rearward movement. It also requires at least three tiedowns for each vehicle stack. Two lateral sideboards alone do not meet language that specifically assigns the two walls to forward and rearward control. Verify which structures oppose those directions, the actual wall height, and how the three restraints prevent the remaining movement.
Without qualifying containment, use four tiedowns per stack
When the load does not use a qualifying four-, three-, or two-sided containment arrangement, Section 393.132 requires at least four tiedowns per vehicle stack. Do not reduce the count because the crushed vehicles interlock, feel heavy, rest against another stack, or are covered by a tarp. Four is the commodity-specific minimum; device condition, attachment, geometry, working load limit, and control of movement still have to be verified.
Measure containment against the finished load height
The rule repeatedly requires containment to extend to the full height of the load. Inspect the finished stack from every accessible side and compare its highest point with the walls or comparable structures being credited. A stack that settles unevenly, a roof section that projects above the wall, or a component leaning through a gap can invalidate the intended alternative. Do not count a side whose height or coverage is only approximate.
Do not place synthetic webbing against crushed vehicles
Section 393.132 prohibits synthetic webbing from securing flattened or crushed vehicles when it contacts the vehicles. Synthetic webbing may be used to connect wire rope or chain to anchor points on the commercial motor vehicle, but the webbing must not touch the crushed cars even when edge protection is present. The exception is narrow. Trace the loaded path and the path that could develop after settling before accepting any web component.
Inspect chains, wire rope, connectors, and anchors
Crushed metal can cut, pinch, abrade, or redirect a restraint. Check chains for stretched, twisted, cracked, bent, gouged, or severely worn links; wire rope for broken wires, kinks, crushing, bird-caging, corrosion, or damaged end fittings; and binders, hooks, connectors, and anchors for cracks, spreading, deformation, wear, or missing retainers. Section 393.104 requires devices, structures, and anchor points used in securement to be in proper working order.
Protect every restraint from sharp scrap edges
Section 393.104 requires edge protection wherever a tiedown is subject to abrasion or cutting, and the protection must resist abrasion, cutting, and crushing. Use protectors compatible with the chain or wire-rope path and the jagged surfaces of the load. Secure them so they remain in position after tensioning and settling. Edge protection does not make prohibited synthetic-webbing contact lawful and does not turn a weak body panel into a rated attachment point.
Use sound load paths instead of fragile body parts
Route restraints around or through substantial portions of the stack using the carrier's approved method, and attach them only to suitable trailer anchors. Avoid glass, thin sheet metal, trim, loose axles, exhaust, wiring, battery components, or parts that can tear free and release tension. Confirm hooks are seated, binders are locked, loose ends are controlled, and no device can contact tires, brakes, lights, or the roadway.
Calculate working load limit separately from tiedown count
Meeting the two-, three-, or four-tiedown minimum does not prove adequate capacity. Under Sections 393.106 and 393.108, determine the aggregate working load limit using the credited amount for each tiedown path and the lowest-rated component, connector, tensioner, and anchor. Use legible manufacturer markings and the correct federal method. Do not substitute breaking strength, chain diameter alone, appearance, or the capacity of an unused anchor for the required calculation.
Prevent liquids from leaking from the transport vehicle
For the three-side, two-side, and no-qualifying-containment alternatives, Section 393.132 requires the transport vehicle to have a means that prevents liquids from leaking from its bottom. Inspect the deck or collection system before loading and again after the load is placed. Look for active drips, pooled fluids, damaged pans or liners, open drains, and trails beneath the vehicle. Stop and obtain qualified help when leakage cannot be contained; securement devices are not a fluid-control system.
Contain loose parts on the bottom and all four sides
Those same alternatives also require a means to prevent loose parts from falling from the bottom and all four sides, extending to the full height of the cargo. The rule allows structural walls, sides or sideboards, suitable covering material, or a combination. Inspect corners, seams, gates, floor openings, and the area above sideboards for gaps large enough to release metal, glass, plastic, or other debris. Containment must remain closed and effective throughout the trip.
Synthetic material may contain loose parts, not secure the stack
Section 393.132 permits synthetic material as containment for loose parts. That permission is different from using synthetic webbing as a tiedown against crushed vehicles, which remains prohibited. Verify the covering material is suitable for the debris, secured on every side, protected from cutting, and extended to the full cargo height where required. A torn tarp or mesh with open edges cannot be credited merely because it is synthetic containment.
Perform a stack-by-stack final inspection
Before movement, verify the cargo classification, stack count and weight, selected containment alternative, wall strength and full-height coverage, required tiedown count for every stack, restraint paths, aggregate WLL, anchors, tensioners, edge protection, leak-control system, bottom and four-side loose-parts containment, load dimensions, axle distribution, and loose equipment. Ask what prevents movement in each direction and what prevents every fluid or fragment from reaching the roadway.
Reinspect after settling and stop for escape evidence
For drivers covered by 49 CFR 392.9(b), inspect the cargo and securement within the first 50 miles and reexamine at duty-status changes, after three hours, or after 150 miles—whichever occurs first. Stop sooner after hard braking, severe road shock, unusual noise, changed handling, lost tension, a leaning stack, damaged wall, shifted cover, fresh leakage, falling debris, or a projecting part. Use a safe location and keep clear of unstable scrap while qualified personnel correct the system. This guide reflects Title 49 eCFR text displayed as current through October 23, 2026; verify current rules, carrier procedures, permits, and site requirements for the actual load.
Educational summaries help you prepare, but official FMCSA and state licensing sources remain the authority for current requirements.
Official sources
49 CFR 393.132 — Flattened or crushed vehicle securement ↗49 CFR 393.104 — Securement devices and systems ↗49 CFR 393.106 — General requirements for securing cargo ↗49 CFR 393.108 — Determining tiedown working load limits ↗49 CFR 392.9 — Inspection of cargo and securement systems ↗ELDT.live independently creates and reviews its content. We do not present practice questions as official examination questions and do not guarantee a licensing result.