Anyone who drives I-40, US 1 or the NC 540 toll road around Cary knows the sound: a sharp crack from the windshield as a truck pulls ahead. North Carolina has a law about loads that fall or blow off vehicles, with a specific rule for rock and gravel. This article explains what it requires, what it does not do, and what to do about the chip it leaves behind.
The covered-load law: G.S. 20-116(g)
The general rule applies to every vehicle on a highway: no vehicle may be driven unless it is loaded so as “to prevent any of its load from falling, blowing, dropping, sifting, leaking, or otherwise escaping”. That covers everything from a pickup carrying mulch to a box truck.
Then the statute adds a specific rule for the loads most likely to break glass. Trucks over 7,500 pounds gross vehicle weight carrying “rock, gravel, stone” must do two things: keep the load at least six inches below the top of the walls, and have it “securely covered by tarpaulin or some other suitable covering”. Both, not one or the other.
| Vehicle | What G.S. 20-116(g) requires |
|---|---|
| Any vehicle on a highway | Loaded to prevent any of the load falling, blowing, dropping, sifting, leaking or escaping |
| Truck over 7,500 lbs carrying rock, gravel or stone | Load six inches below the walls, and securely covered by a tarpaulin or other suitable covering |
Tell Impex the car and the damage. Impex checks the glass against your VIN and comes back with a quote and a time.
Why the law exists
The point of the rule is plain from its wording: loose stone coming off a load is a hazard to everyone behind it. A covered, properly loaded truck should not be dropping gravel at highway speed. It does not stop every stone: gravel also comes up off the road surface itself.
Around Cary there has been plenty of construction traffic. The Complete 540 project has been extending the Triangle Expressway from the NC 55 Bypass in Apex toward Knightdale: its first phase, about 18 miles to I-40 and US 70, opened on September 25, 2024, and the second phase of about 10 miles is scheduled to finish in 2028. Big road projects mean trucks carrying stone.
When a stone hits your windshield
- Keep driving safely. Do not brake hard or swerve. Pull over only when it is safe to look.
- Look at the damage that day. A small chip is very different from a crack that has started to run.
- Note where and when. The road, the direction, the time. It helps when you file a claim.
- Call while it is small. A chip that is still small can usually be repaired; a crack that reaches the edge cannot.
Following further back from trucks with open beds is common-sense advice on any highway: the more distance, the more time for a stone to drop before it reaches you.
Repair or replacement
The ROLAGS repair standard says stone breaks up to two inches across and single line cracks up to 14 inches are repairable. Impex Auto Glass’s own rule of thumb is that damage which is small, shallow and away from the edges, such as a chip smaller than a quarter, can usually be filled with resin. For the details and the sizes, see windshield repair in Cary. If the crack has reached the edge or sits in front of the driver, see windshield replacement in Cary.
Who pays for the chip
For most drivers, the answer is their own comprehensive coverage. The NC Department of Insurance lists “Missiles or falling objects” and “Breakage of glass” among the losses comprehensive pays for, less any deductible. Impex’s insurance guide notes that many insurers waive the deductible for windshield chip repair. A comprehensive glass claim is not an at-fault accident, so it adds no Safe Driver Incentive Plan points, and under G.S. 58-3-180 you choose who does the repair. The full picture is on the insurance claims page.
In short
NC law requires trucks over 7,500 pounds hauling rock, gravel or stone to keep the load six inches below the walls and tarped. Stones still fly. When one hits, look that day, call while the chip is small, and check whether your insurer waives the deductible for a repair.
Tell Impex the car and the damage. Impex checks the glass against your VIN and comes back with a quote and a time.
Questions people ask
Do gravel trucks have to be covered in NC?
Yes, if they are over 7,500 pounds gross vehicle weight and carrying rock, gravel or stone. G.S. 20-116(g) requires the load six inches below the walls and securely covered by a tarpaulin or other suitable covering.
Does insurance cover a windshield chip from a rock?
Under comprehensive coverage, yes, less any deductible. The NC Department of Insurance lists missiles or falling objects and breakage of glass as comprehensive losses, and many insurers waive the deductible for chip repair.
How soon should a rock chip be repaired?
As soon as you can arrange it. A small chip can usually be repaired; once a crack spreads too far or reaches the edge, replacement is the safer choice.
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