Road debris includes objects that fall from vehicles, natural materials, discarded litter and vehicle or tire fragments. Available measurements range from national crash estimates to local cleanup totals and single-roadway field studies, so the figures below keep their original geography, period, denominator and limitations explicit.
Key Road Debris Statistics
The following highlights span crashes, consequences, composition, cleanup and field measurements:
- More than 200,000 police-reported crashes involved road debris in the United States during 2011–2014, according to an AAA estimate.
- About 51,000 U.S. police-reported crashes involved a vehicle striking an object from another vehicle or a non-fixed roadway object in 2010, based on NHTSA data summarized by GAO.
- Roadway-debris crashes represented about 1% of approximately 5,419,000 U.S. police-reported crashes in 2010, using GAO’s rounded comparison.
- Approximately 39,000 injuries were associated with U.S. road debris crashes during 2011–2014, in AAA’s national estimate.
- More than 500 deaths were associated with U.S. road debris crashes during 2011–2014, in AAA’s national estimate.
- Nearly 37% of deaths in AAA’s 2011–2014 debris-crash analysis followed a driver swerving to avoid the object, rather than directly striking it.
- About 440 roadway-debris fatalities were recorded in the United States in 2010, in the NHTSA category summarized by GAO.
- Unsecured-load fines or penalties ranged from $10 to $5,000 across U.S. states and the District of Columbia in a 2012 survey, describing statutory penalties rather than amounts actually paid.
- More than 250 crashes in Utah were attributed to unsecured loads in 2025, according to Utah Highway Patrol reporting.
- Nearly 38 million pounds of litter accumulate in Washington each year, according to the state’s annual estimate.
- Washington’s annual litter estimate equals about 7 billion pieces, with the state noting that piece size and mass vary.
- Urban interstates in Washington accumulate about 1,579 pounds of litter per mile each year, in the road-class estimate.
- Unsecured vehicle loads accounted for 39% of urban-interstate litter in Washington, while intentional littering accounted for nearly 48%.
- Washington Ecology-funded programs collected more than 5.2 million pounds of litter and cleaned more than 18,000 roadway miles in 2024, measuring program activity rather than total litter generated.
- WSDOT collected and disposed of 726 tons of trash from Washington state highways in 2025, a highway-collection total.
- WSDOT and Washington Ecology spend more than $17 million annually on statewide litter pickup and removal activities, according to the agencies.
- A peer-reviewed Nantes study collected 88.5 kilograms of debris from an 800-meter roadway over roughly one year, in a single-roadway field study.
- Plastic made up 60% of the 88.5 kilograms collected in the Nantes study, while plastic items represented 84% of its 36,439 characterized items.
- Among source-assigned debris mass in Nantes, 62.8% was estimated as accidental leakage, with the denominator limited to mass for which a source could be assigned.
Contents
- Key Road Debris Statistics
- Road Debris Crash Statistics in the United States
- Road Debris Injuries, Deaths and Crash Circumstances
- Washington Road Litter and Unsecured-Load Statistics
- What Road Debris Is Made Of
- Roadside Cleanup Volumes and Public Costs
- Roadway Macrolitter Measurements from Field Research
Road Debris Crash Statistics in the United States
National estimates show why road debris is difficult to summarize with one number. AAA estimated more than 200,000 police-reported U.S. crashes involving road debris during 2011–2014, while GAO’s summary of NHTSA data counted about 51,000 crashes involving an object that came off another vehicle or a non-fixed object in the roadway in 2010.
The categories are related but not identical. GAO noted that its roadway-debris category included both human-caused debris and natural objects, while AAA defined debris involvement through striking or avoiding a non-fixed roadway object.
| Measure | Period and geography | Result | Measurement note |
|---|---|---|---|
| Police-reported debris crashes | 2011–2014, United States | More than 200,000 | AAA estimate |
| Object or non-fixed-object crashes | 2010, United States | About 51,000 | NHTSA data summarized by GAO |
| Share of all police-reported crashes | 2010, United States | About 1% | Compared with approximately 5,419,000 total crashes |
Source links: American Drivers Aren’t Securing Their Loads on the Road and Highway Safety: Federal and State Efforts Related to Accidents That Involve Non-Commercial Vehicles Carrying Unsecured Loads.
AAA’s 2011–2014 analysis also found that more than one in three debris-related crashes occurred between 10:00 a.m. and 3:59 p.m. That time-of-day result is a distribution within AAA’s debris-crash analysis, not a national estimate of all traffic activity.
Road Debris Injuries, Deaths and Crash Circumstances
AAA estimated approximately 39,000 injuries and more than 500 deaths associated with U.S. road debris during 2011–2014. The study’s definition included crashes in which drivers struck or avoided a non-fixed object, which matters because avoidance can create a separate collision pathway.
Nearly 37% of deaths in AAA’s debris-related crash analysis resulted from a driver swerving to avoid the object. This is the share of deaths in the debris-crash analysis, not the share of all roadway deaths.
GAO’s NHTSA summary recorded about 440 roadway-debris fatalities in 2010. GAO compared that rounded figure with 32,855 total motor-vehicle fatalities, reporting the debris category as about 1% of the total.
American Drivers Aren’t Securing Their Loads on the Road supplies the AAA estimates, while Highway Safety: Federal and State Efforts Related to Accidents That Involve Non-Commercial Vehicles Carrying Unsecured Loads supplies the GAO summary and its category caveats.
Utah provides a more recent agency-level indicator rather than a national crash estimate. Utah Highway Patrol handled more than 70 road-debris calls per day on average in its 2025 messaging, described the figure as more than 25,000 calls per year, and reported more than 250 statewide crashes attributed to unsecured loads in 2025.
The Utah call count measures agency calls, not unique debris objects or crashes. These figures come from Utah DPS Highlights Dangers Of Unsecured Loads, Urges Drivers to Tie It Down.
GAO’s 2012 survey found that reported unsecured-load fines or penalties ranged from $10 to $5,000 across states and the District of Columbia. The range describes statutory penalties reported to GAO, not amounts actually paid.
Washington Road Litter and Unsecured-Load Statistics
Washington’s statewide litter estimates measure roadside material, not debris-related crashes. The state estimated nearly 38 million pounds of litter and about 7 billion pieces each year, equivalent to approximately 5 pounds and 879 pieces per person per year after population normalization.
Urban interstates show how road class changes the measurement:
- Urban interstates accumulated about 1,579 pounds of litter per mile each year in Washington.
- The same road class accumulated about 73,580 litter pieces per mile each year.
- Intentional littering accounted for nearly 48% of urban-interstate litter.
- Unsecured vehicle loads accounted for 39%.
- Vehicle and tire debris accounted for 14%.
The percentages are source classifications for litter, not crash shares. The piece and weight measures are not interchangeable because piece size and mass vary.
These annual and road-class figures come from We Keep WA Litter Free. Washington’s 2022 statewide study also estimated more than 24,000 litter pieces per mile on urban interstate highways and nearly 31,000 pieces per acre on urban interchanges; the former is not an annual accumulation rate unless stated as such.
Washington Ecology reported that its funded programs collected more than 5.2 million pounds of litter and cleaned more than 18,000 roadway miles in 2024. Those are program activity measures and may include repeated coverage; they do not represent all litter generated statewide.
The state also reported that unsecured-load litter causes more than 300 traffic crashes per year. This public-information estimate uses a state agency framing and is not directly comparable with AAA’s national database definition.
What Road Debris Is Made Of: Materials and Sources
Washington’s overall-roads composition study measured litter by weight across interstates, state routes and county roads. The largest reported components included glass beverage containers at 23.7%, wood, lumber and particleboard at 11.1%, other organics at 10.1%, tires at 7.7%, metal automotive parts at 2.6% and other plastics or composite materials at 2.6%.
| Component | Share of litter by weight | Scope |
|---|---|---|
| Glass beverage containers | 23.7% | Washington overall-roads sample |
| Wood, lumber and particleboard | 11.1% | Washington overall-roads sample |
| Other organics | 10.1% | Washington overall-roads sample |
| Tires | 7.7% | Washington overall-roads sample |
| Metal automotive parts | 2.6% | Washington overall-roads sample |
| Other plastics or composites | 2.6% | Washington overall-roads sample |
The study’s ten largest litter components represented 74.1% of Washington’s overall-roads litter by weight. These are composition estimates, not direct measurements of crash likelihood or the prevalence of tire failures.
The composition figures and study caveats are reported in Washington State Litter Study: Litter Generation & Composition Report.
Roadside Cleanup Volumes and Public Costs
Agency cleanup totals describe what crews collected during specified programs or years. They should not be interpreted as total debris generated or as a removal rate unless the source explicitly defines them that way.
| Program or agency | Period | Reported result |
|---|---|---|
| Washington State Department of Transportation | 2025 | 726 tons collected and disposed of |
| WSDOT and Washington Ecology | Annual | More than $17 million spent on statewide litter pickup and removal |
| Washington Ecology-funded programs | 2024 | More than 5.2 million pounds collected |
| Caltrans Clean California | Through June 2022 | Nearly 646,000 cubic yards collected |
WSDOT’s 2025 highway total and the annual spending statement are from Litter on state highways. Caltrans reported that nearly 646,000 cubic yards collected through June 2022 equaled more than 10,800 tons, or about 197 Olympic-sized swimming pools; the volume-to-weight equivalence is illustrative and material density varies.
During Clean California’s first 10 months, Caltrans held 114 Dump Day events that collected more than 34,600 cubic yards of litter, including 13,339 tires and more than 3,100 mattresses. The program also purchased 269 pieces of equipment and filled 546 litter-collection maintenance positions through June 2022.
Those program measures are reported in Mile Marker: A Caltrans Performance Report, Issue 1, 2022 — Clean California. Equipment and staffing counts indicate program scale, not cleanup effectiveness or a national total.
Roadway Macrolitter Measurements from Field Research
A peer-reviewed study in Nantes, France, provides a detailed single-roadway case study. Researchers collected 88.5 kilograms of debris over roughly one year from an 800-meter highly frequented roadway carrying around 90,000 vehicles per day.
The study annualized the measured load at 42.8 kilograms per hectare per year and 117.4 kilograms per kilometer per year. Those rates apply to the studied roadway and surrounding measured area; they are not national or global averages.
Researchers characterized 36,439 debris items. Plastic accounted for 53.2 kilograms, or 60% of collected mass, while plastic items represented 84% of characterized items, illustrating why item-count and weight shares answer different questions.
The ten most common item types accounted for 92% of characterized items. Plastic fragments represented 31% of items and cigarette butts represented 18%.
Source attribution was limited: input sources could be assigned for 43% of collected debris mass. Within that source-assigned mass, 37.2% was estimated as deliberate littering and 62.8% as accidental leakage, which the study linked to uncovered trucks and unsecured loads.
The field study is Amount, composition and sources of macrolitter from a highly frequented roadway. Its results are a measured case study from one roadway and sampling period, so they should not be transferred to other roads without comparable traffic and site conditions.