Hidden Highways: Fog and Traffic Crashes on America’s Roads
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Summary
This report by the AAA Foundation for Traffic Safety addresses the under-researched impact of fog and smoke on highway safety. While these atmospheric conditions are known to reduce visibility and impair driver perception, there is limited data regarding their prevalence in national crash statistics or their specific role in crash outcomes. The study aims to fill this knowledge gap by analyzing long-term national trends to identify high-risk scenarios, such as multi-vehicle pileups, and to provide evidence-based recommendations for stakeholders including highway officials, automakers, and safety advocates. The authors conducted a descriptive analysis using two national databases overseen by the National Highway Traffic Safety Administration (NHTSA). They examined 23 years of fatal crash data (1990–2012) from the Fatality Analysis Reporting System (FARS) and 19 years of police-reported crash data (1990–2008) from the National Automotive Sampling System General Estimates System (NASS GES). Due to a coding change in 2007 that combined fog, smoke, and smog, the report treats these conditions collectively. The analysis tracked crash frequencies, percentages relative to total crashes, and characteristics such as time of day, season, roadway type, driver age, and regional variations. The results indicate that while the absolute number and percentage of fog- and smoke-related crashes have declined over the past two decades, these conditions remain significant risk factors. Fog-related fatal crashes are most prevalent during winter months (December–February) and in the early morning hours (midnight–11:59 AM). Geographically, the Southeast, Midwest, and South/Gulf Coast regions experience the highest volume of such crashes, while New England, the central U.S., and the Pacific Northwest have the highest proportions relative to total crashes. These crashes occur more frequently in rural areas and on undivided, two-way roadways. Notably, fog is a factor in nearly one-in-five fatal crashes involving 10 or more vehicles, compared to roughly 1.4% for single-vehicle crashes. Young drivers aged 20–29 exhibit the highest prevalence of fog-related fatal crashes, likely due to inexperience and poor speed adjustment, whereas older drivers show the lowest prevalence. The study concludes that fog and smoke pose a disproportionate threat to safety, particularly regarding severe, multi-vehicle pileups. The authors attribute this to drivers’ impaired distance perception and tendency to follow lead vehicles too closely to maintain visual contact. To mitigate these risks, the report recommends enhanced driver education focusing on fog-specific hazards, increased supervised driving practice for teens in adverse conditions, and infrastructure improvements such as median barriers and rumble strips on undivided rural roads. Additionally, the authors suggest vehicle design modifications, such as lowering rear light positions, and further research into the efficacy of crash-avoidance technologies in low-visibility conditions.
Key finding
In U.S. FARS data (1990-2012), fog or smoke was coded in nearly one in five fatal crashes involving ten or more vehicles, versus about 1.4-1.5% of single-vehicle and two-to-five-vehicle fatal crashes, highlighting elevated risk for severe multi-vehicle pileups under reduced visibility.
Methodology
modeling
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_aaa_foundation on 2026-05-23 (5 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | aaa_foundation | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 2 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: crash risk outcomes
- Methodological Resource: dataset resource