Cargo securement in NC: tiedown rules, tarps and what troopers check

The short version

On NC roads, trucks of 26,001 pounds or more, and interstate trucks that meet the federal 10,001-pound commercial vehicle line, must follow the federal cargo securement rules in 49 CFR 393.100 to 393.136. [14]

The core test: the load must not leak, spill, blow or fall off, and it must not shift enough to upset how the truck handles. [1]

Your tiedowns must add up to at least half the cargo's weight in working load limit. You also need a minimum number of tiedowns based on the length of each piece. [4][6]

You must check the load within the first 50 miles. After that, check again at every change of duty status, every 3 hours of driving or every 150 miles, whichever comes first. [10]

NC adds its own law. Nothing may fall, blow or sift off any vehicle, and heavier trucks hauling rock or gravel need both a tarp and 6 inches of freeboard. [11]

Securement was the vehicle focus of the 2026 International Roadcheck in May. Everything here is as of October 2026, so check the current text before you rely on it. [16][18]

Who the federal rules cover in NC

NC adopts the federal safety rules, Parts 390 to 397, by state rule. For interstate carriers, they apply to any vehicle that counts as a commercial motor vehicle under the federal definition. [14]

For trucks that stay inside NC, the same rules apply when the truck or combination is rated or weighs 26,001 pounds or more, whichever is greater. They also apply to placarded hazmat loads. [14]

So a pickup and trailer under 26,001 pounds that never leaves NC is outside Part 393 under that rule. It is still covered by NC's own spill law, which applies to every vehicle. [11][14]

The federal securement subpart applies to trucks, truck tractors, semitrailers, full trailers and pole trailers. [1]

State law lets the Highway Patrol set safety standards for carrier vehicles, stop and inspect them, and enforce the federal safety rules on NC highways. [13]

Our advice, not a rule: if you are unsure whether your rig is covered, secure it to Part 393 anyway. The physics don't change at 26,001 pounds. [1][14]

What a secured load has to survive

The rules set the forces a securement system must hold. Working load limits must not be exceeded at 0.435 g of forward braking, 0.5 g rearward and 0.25 g sideways. [2]

Breaking strength must hold at 0.8 g forward, 0.5 g rearward and 0.5 g sideways. Each direction is tested on its own. [2]

Cargo that sits above the walls of the trailer needs downward force equal to at least 20% of its weight. [2]

You meet the test if the cargo is immobilized, or packed in a sided trailer with strong walls so it can't shift or tip. Otherwise you follow the specific tiedown rules. [2]

Damaged gear is not allowed. That means straps with cuts, chains with cracked links, and weak anchor points, stakes or headerboards that hurt performance. [3]

Tiedowns must not have knots. They must be fastened so they can't come loose, and you must use edge protection wherever a strap could be cut or worn by the cargo. [3]

Each tiedown must be adjustable so the driver can tighten it on the road. Steel strapping is the only exception. [3]

Working load limit: doing the math

The rule: the working load limits of all tiedowns on a piece or group of cargo must add up to at least half its weight. [4]

How you route a tiedown changes what it counts for. A strap from one side of the trailer, over the cargo, to the other side counts its full rating. [4]

A tiedown from the trailer to an anchor point on the cargo counts half. So does one that goes over or around the cargo and back to the same side. [4]

A tiedown is only as strong as its weakest part, including the ratchet or binder and the anchor point it hooks to. [5]

Use the manufacturer's marked rating. If there is no marking, use the federal table. Unmarked chain counts as the weakest grade, grade 30 proof coil. [5]

Table values for unmarked webbing: 2,000 pounds for a 2-inch strap, 3,000 for 3-inch and 4,000 for 4-inch. For 3/8-inch chain, grade 70 is 6,600 pounds and grade 30 is 2,650. [5]

Example, our math: a 40,000-pound load needs 20,000 pounds of working load limit. Five unmarked 4-inch straps run side to side over the load add up to exactly 20,000. [4][5]

Hook grade 70 chain from the deck straight to a machine's tie point and each chain counts half of 6,600, or 3,300 pounds. Plan for that before you pick a chain count. [4][5]

An unmarked friction mat counts as holding back 50% of the weight resting on it. [5]

How many tiedowns a load needs

The count is a second test on top of the weight math. You must pass both. [6]

If nothing blocks the cargo in front, such as a headerboard, bulkhead or other secured cargo, you need one tiedown for a piece 5 feet or shorter that weighs 1,100 pounds or less. [6]

You need two if the piece is 5 feet or shorter but heavier than 1,100 pounds, or if it is over 5 feet up to 10 feet long, at any weight. [6]

Over 10 feet, you need two, plus one more for each 10 feet, or part of 10 feet, past the first 10. Example, our math: an unblocked 24-foot piece needs four. [6]

If the cargo is blocked in front, you need at least one tiedown for every 10 feet of length, or fraction of it. [6]

Special hauls of machinery or structural pieces like beams, girders and crane booms that need special fastening are exempt from the count. They must still be securely fastened. [6]

A headerboard used as blocking must reach 4 feet above the floor, or high enough to block the cargo if that is lower. Under 6 feet tall, it must hold half the cargo's weight. [6]

Loads with their own rules

Some cargo has its own section. Those rules win where they add requirements, and the general rules still apply on top. Logs have their own rule too, covered in our log truck guide. [4][7]

Heavy equipment on wheels or tracks weighing 10,000 pounds or more needs at least four tiedowns, near the front and rear or at the machine's tie points. [8]

Buckets and other attachments must be lowered and secured, and an articulated machine must be held so it can't bend in transit. [8]

Metal coils of 5,000 pounds or more have set patterns. With the eyes crosswise, the coil must sit off the deck in a cradle or chocks, and crossing chains through the eye in an X is banned. [7]

Lumber and building product bundles stacked in tiers must be blocked by stakes or held by tiedowns and spacers set out in the rule. Top bundles over 5 feet long get at least two tiedowns. In a strong sided trailer, the general rules apply instead. [7]

Concrete pipe on a flatbed needs half its weight in working load limit per group, timber blocking at least 4 by 6 inches, and no third tier until every well below is filled. [8]

A container on a chassis must be locked at all lower corners. It may move no more than half an inch forward, back, left or right, or 1 inch up and down. [8]

Crushed cars can't be held with synthetic straps touching the cars. Roll-off containers must be secured at the rear within 6 feet 7 inches of the back. [9]

Boulders over 11,000 pounds on an open deck must ride flattest side down on hardwood blocking, tapered end forward, and only chain may hold them. [9]

Your duty to check the load

Before you drive, you must be satisfied the cargo is spread out properly and secured. Tailgates, doors, tarps and the spare tire must be secured too. [10]

The load can't block your view ahead or to the sides, or keep you from the emergency gear or the cab door. [10]

Inspect the cargo and its tiedowns within the first 50 miles of a trip. Fix anything loose, and add tiedowns if needed. [10]

Check again whenever you change duty status, after 3 hours of driving, or after 150 miles, whichever comes first. [10]

The checks don't apply if the trailer is sealed and you were told not to open it, or if the way it was loaded makes inspection impractical. [10]

Our advice, not a rule: in the NC mountains, add a check before a long downgrade. A stop there costs less than a shifted load. [10]

NC's own spill and tarp law

G.S. 20-116(g) covers every vehicle, not just big trucks. It must be built and loaded so nothing falls, blows, drops, sifts or leaks off, and it can't have holes the load can escape through. [11]

A truck licensed over 7,500 pounds hauling rock, gravel or stone needs both: the load 6 inches below the tops of all four walls at loading, and a secure tarp or other cover. [11]

Sand, and rock or gravel in lighter trucks, needs one of three: 6 inches of freeboard, a tarp, or a body built to keep the load in. Rainwater doesn't count as load. [11]

The law does not apply to seed cotton, poultry, livestock, or silage and feed grain for animals. [11]

Breaking it is an infraction. The penalty is up to $100 unless a specific penalty applies, and court costs are separate. [11][12]

Bulk sand, gravel and grain in a dump body or hopper are outside the general federal tiedown section, but the NC tarp law still applies. Our dump truck guide covers that work in detail. [4][11]

What inspectors look for, and what happens

The Highway Patrol's motor carrier troopers enforce state and federal truck laws, run the weigh stations and work to increase driver and vehicle inspections. [15]

Under NC law, an officer who finds a carrier's truck likely to cause a crash because of its loading can declare it out of service. It can't move until the fix is made. [13]

Commercial vehicle, size and weight, and out-of-service citations can be paid online through the state payment site. [15]

During the 2026 Roadcheck, inspectors across North America ran 54,575 inspections. Cargo securement was the fourth most common vehicle out-of-service problem, with 1,724 violations. [16]

That category covered freight not properly restrained, tied down, packed or locked. CVSA's updated out-of-service rules, in effect April 1, 2026, added a damage chart for wire rope tiedowns. [16][19]

Loose loads cause real crashes here. In March 2023, a steel spool of pipe came off a pickup near Selma and hit an oncoming car, which caught fire. Troopers charged the driver with failure to secure a load. [20]

We found no current NC count of securement tickets or out-of-service orders as of October 2026. [15]

Our advice, not a rule: before you leave, count your tiedowns against the length rule, add up the working load limits, and look for cuts, knots and missing edge protection. [3][4][6]