A strip of truck tire tread, a chunk of cargo, or a loose part comes off a rig and hits your car, and the truck never stops. You may still have a claim. If you can identify the truck, the carrier is liable for poor tire maintenance or an unsecured load. If you can’t, California uninsured-motorist coverage can pay for injuries, but only if you report to police, the sheriff, or CHP within 24 hours and give your insurer a sworn statement within 30 days (Ins. Code §11580.2). Nationally, road debris played a role in 319,724 crashes and 433 deaths from 2018 to 2023, per the AAA Foundation for Traffic Safety.
A debris hit doesn’t feel like a normal wreck. Nobody pulls over to swap insurance. You’ve got a cracked windshield and a set of trailer lights getting smaller up the road. One driver described it on r/Insurance in January 2026: a commercial truck hit a guardrail, something struck their windshield, and the trucking company’s insurer declined the claim. The replies said to use glass coverage or small claims court. For a windshield, that can be fine. It skips the rules that decide everything once someone is hurt.
319,724 debris crashes in six years
The best national count comes from the AAA Foundation’s November 2025 study. Because police reports often miss debris, the researchers paired detailed Michigan crash reports with national crash data to fill the gap.
| Measure (U.S., 2018–2023) | Value | Source |
|---|---|---|
| Crashes involving road debris | 319,724 | AAA Foundation (2025) |
| Injuries | 32,802 | AAA Foundation (2025) |
| Deaths | 433 | AAA Foundation (2025) |
| Annual average | ~53,000 crashes, ~5,500 injuries, ~72 deaths | AAA Foundation (2025) |
| Crashes where a vehicle struck or was struck by a non-fixed object | Nearly 90% | AAA Foundation, as reported (2025) |
| Injuries / deaths involving a vehicle that crashed after avoiding an object | 25% / 49% | AAA Foundation, as reported (2025) |
Most of the junk came from detached vehicle parts, cargo, tools and building materials, and natural debris. Here’s the gap: the 2025 study doesn’t say how many debris crashes involve large trucks, and no public dataset does. So nobody has a reliable national count of truck-tire debris crashes. Anyone quoting one is guessing.
The earlier AAA Foundation study (2011–2014 data, published 2016) found about two-thirds of debris crashes came from items falling off vehicles because of poor maintenance or unsecured loads, and that debris crashes were about four times as likely on interstates. The newer study doesn’t repeat those breakdowns, so those are still the latest figures.
Look hard at the avoidance number. Nearly half of debris deaths involved a driver who swerved or braked to miss something and crashed anyway. In those wrecks the debris may never touch the car, and that matters a lot under the uninsured-motorist rules below.
When the truck can be identified: the carrier’s duties
If you got the company name off the door or the trailer, two rules put debris from that truck on the carrier.
| Rule | Requirement | Source |
|---|---|---|
| Steer (front) tires | At least 4/32 inch tread depth in a major groove | 49 CFR 393.75 |
| All other tires | At least 2/32 inch tread depth | 49 CFR 393.75 |
| Loads | Vehicle must be built, covered, or loaded so contents cannot drop, spill, blow, or escape onto the highway | Cal. Veh. Code §23114 |
When a tread lets go, it usually traces back to maintenance: worn or damaged tires that should’ve been caught on a pre-trip or at the shop. That’s why a tire blowout crash often becomes a claim against the carrier rather than just the driver, and why an unsecured load raises the same questions covered in our guide to cargo and lost-load crashes. The trailer owner or the company that loaded the cargo can share liability. The hard part is naming the truck. Get the company name, USDOT number, trailer markings, and direction of travel, and ask around for dash cam or witness video.
When the truck keeps going: California uninsured-motorist rules
No name, no DOT number, nothing? If you were hurt, California treats that truck like an uninsured vehicle, and your own policy steps in. Insurance Code §11580.2 attaches strict conditions, and missing one can sink the claim.
| Requirement | Deadline or rule | Source |
|---|---|---|
| Physical contact with you or the car you were in | Required for an unidentified vehicle | Ins. Code §11580.2(b)(1) |
| Report to city police, county sheriff, or CHP | Within 24 hours | Ins. Code §11580.2(b)(1) |
| Sworn statement to your insurer | Within 30 days after that | Ins. Code §11580.2(b)(1) |
| Sue, settle, or start arbitration | Within 2 years of the crash | Ins. Code §11580.2(i) |
Debris cases live or die on the physical-contact rule. In Pham v. Allstate Insurance Co. (1988), a rock fell from an unidentified dump truck, bounced off the highway, and came through the windshield. The Court of Appeal held that counted as contact, because nothing broke the chain from the truck to the car.
Debris that had already come to rest on the road before you hit it is a weaker case. A driver who crashed while swerving to miss debris, without any contact, may not qualify at all. These cases turn on the facts. And keep in mind that uninsured-motorist coverage in California pays for bodily injury; damage to the car itself generally goes through your own collision or glass coverage.
Check your deadlines
Put in the crash date and you’ll see all three uninsured-motorist deadlines laid out.
Enter the crash date to see the three deadlines.
Based on Cal. Ins. Code §11580.2(b)(1) and (i). The statute runs the 30 days from the report (“within 30 days thereafter”), so file as soon as you have reported — do not wait for the last day. The two-year personal injury deadline against an identified carrier is separate. Your policy may add its own notice requirements; confirm with an attorney.
If the carrier is identified, the two-year deadline to sue it for personal injury runs on its own clock. Our truck accident filing deadline calculator covers it.
What to do in the first 24 hours
- Get off the road and get checked out. Write down any symptoms, even ones that seem minor.
- Call police or CHP and make a report. Do it within 24 hours even if the claim seems small.
- Photograph the debris, the road, your car, and where it hit. Keep the debris if it’s safe to grab.
- Write down anything you saw on the truck: company name, USDOT number, trailer color, direction.
- Get witness names and numbers, and ask about dash cam video.
- Tell your own insurer right away, and ask for the uninsured-motorist sworn-statement form.
If you were hurt, talk to a lawyer before you give anyone a recorded statement. The same first steps apply in any truck accident, and a free case review connects you with a truck attorney licensed in the state where the crash happened. The uninsured-motorist reporting rules above are California’s; other states set their own deadlines and contact requirements. If a carrier is identified, it will also help to understand what you keep after fees and medical liens.
Methodology
Researched September 23, 2026. National debris figures are from the AAA Foundation for Traffic Safety’s November 2025 report; the share figures for avoidance crashes are as reported in coverage of that report. The two-thirds and interstate figures are from the AAA Foundation’s 2016 study (2011–2014 data), included because the 2025 update does not report them. Tread-depth and load rules are from 49 CFR 393.75 and California Vehicle Code §23114. Uninsured-motorist requirements are quoted from the current text of Insurance Code §11580.2, and the debris-contact holding is from Pham v. Allstate (1988) 206 Cal.App.3d 1193. No public source reports truck-specific debris crash counts. This page is general information, not legal advice.
Sources
- The Safety Impact of Road Debris: Updated Prevalences of Crashes, Injuries, and Deaths in the United States, 2018–2023 (November 2025) — AAA Foundation for Traffic Safety
- AAA Foundation calls on state, national agencies to coordinate road debris countermeasures (Nov. 11, 2025) — Repairer Driven News
- The Prevalence of Motor Vehicle Crashes Involving Road Debris, United States, 2011–2014 — AAA Foundation for Traffic Safety
- 49 CFR § 393.75 — Tires — eCFR
- California Vehicle Code § 23114 — Spilling loads — Justia
- California Insurance Code § 11580.2 — Uninsured motorist coverage — FindLaw
- Oanh Thi Pham v. Allstate Insurance Co. (1988) 206 Cal.App.3d 1193 — CourtListener
- “Commercial truck tire hit my car. Insurance declining claim” — r/Insurance (Reddit)
Federal regulations and crash statistics are updated periodically. Figures cited on this page reflect the referenced publications at the time of writing; check the source for the current edition.