DOT & FMCSA Cargo Securement FAQ

Answers to the questions haulers and tow operators ask most about federal tie-down rules, based on 49 CFR Part 393, Subpart I and §392.9, with links to the regulation text. This is not legal advice. Regulations change, so read the current text and your state's requirements.

How many tie-downs are required per vehicle?

For automobiles, light trucks and vans of 10,000 lb or less, §393.128 requires at least two tiedowns, and the vehicle must be restrained at the front and rear against lateral, forward, rearward and vertical movement. Many haulers secure all four wheels. Heavier vehicles fall under §393.130.

What is the minimum working load limit (WLL)?

Under §393.106, the aggregate WLL of the tiedowns must be at least 50% of the weight of the cargo. WLL is the rating marked by the manufacturer. Add up the marked WLL of the straps on each vehicle and compare it to the vehicle's weight.

What is the 3-point over-wheel tie-down method?

The 3-point method uses a single strap that loops over the tire and attaches to the trailer at three anchor points: front-outer corner, rear-outer corner, and front-inner corner toward the centerline. See our over-wheel straps.

Can I use chain instead of straps on an auto transport?

Part 393 allows chain as a tiedown, but chain contact can damage a vehicle's finish, so straps with synthetic webbing are the usual choice for finished vehicles. Chain suits heavy equipment. Browse our chain.

What is the difference between a cargo strap and an auto tie-down strap?

Cargo straps are general purpose, for boxes, equipment and freight. Auto tie-down straps are made for vehicle contact: webbing, hooks and ends sized to wrap a tire or axle. See our auto tie-down straps.

What must be on a strap's working load limit (WLL) tag?

Webbing tiedowns used on commercial motor vehicles must conform to WSTDA-T1, and conforming straps carry a permanent, legible tag or label attached to the assembly showing the working load limit, the manufacturer's name or trademark, and the webbing material, such as polyester or nylon. A missing, torn or unreadable tag leaves the strap with no verifiable rating, and inspectors may treat it as non-compliant. The assembly's rating is also limited by its weakest component, such as the hooks or ratchet.

What condition must a strap be in?

Under §393.104, tiedowns with damaged or weakened components, such as cracks or cuts, must be removed from service. Synthetic webbing must conform to WSTDA-T1, and edge protection is required where a tiedown contacts cargo to resist abrasion, cutting and crushing.

How often must I inspect straps during a trip?

Under §392.9(b), inspect the cargo and securement devices within the first 50 miles, then re-examine them whenever you change duty status, after 3 hours of driving, or after 150 miles, whichever comes first.

What happens if my securement fails an inspection?

Cargo securement violations can lead to citations and can put a vehicle out of service until the problem is fixed. Penalties vary, so check current FMCSA and state guidance.

Does DiamondWeave™ webbing meet DOT requirements?

Yes. DiamondWeave™ straps sold by GO-TOW.com are compliant with 49 CFR Part 393. FMCSA does not issue approval stamps for individual straps. DiamondWeave™ webbing is patented (US Patent 8136555) and has excellent abrasion resistance compared to standard webbing.

Do state rules differ for local hauling?

Part 393 applies to commercial motor vehicles in interstate commerce. States set rules for intrastate operations, and many adopt the federal rules or similar ones. Check your state DOT.