Motor Vehicle Crashes, Injuries, and Deaths in Relation to Weather Conditions, United States, 2010-2014
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Summary
This study investigates the relationship between weather conditions, roadway surface conditions, and the frequency and severity of motor vehicle crashes in the United States from 2010 to 2014. The research aims to quantify the number of crashes, injuries, and deaths occurring under adverse conditions and to determine how these conditions affect crash severity compared to clear weather and dry roads. The analysis utilized data from the National Highway Traffic Safety Administration’s General Estimates System (GES), a representative sample of police-reported crashes, and the Fatality Analysis Reporting System (FARS), a census of fatal crashes. Weather conditions were categorized as clear, rain, snow, sleet, fog, or other, while roadway surfaces were classified as dry, wet, snow-covered, ice-covered, or other. Poisson regression was employed to calculate adjusted rates of injuries and fatalities per 1,000 crashes, controlling for variables such as region, season, time of day, roadway type, vehicle type, and driver age. The results indicate that an average of 1,179,253 crashes, 425,103 injuries, and 5,137 deaths occurred annually in adverse weather or roadway conditions, representing 21.0% of all crashes, 18.5% of injuries, and 15.6% of fatalities. Contrary to common assumptions, crashes in adverse conditions were generally less severe than those in clear weather on dry roads. After adjusting for confounding factors, crashes on snow-covered roads resulted in 31% fewer injuries and 47% fewer fatalities per crash than those on dry roads. Similarly, ice-covered roads were associated with 19% fewer injuries and 29% fewer fatalities. The only exception was fog, which was associated with a 155% increase in fatalities per crash compared to clear weather. Additionally, adverse conditions were more prevalent in single-vehicle crashes and among younger drivers. The authors conclude that while adverse weather and slippery surfaces are linked to lower crash severity—likely due to reduced driving speeds and increased caution—other research suggests these conditions increase the overall risk of crashing, particularly for less severe incidents. The study highlights a critical limitation: the data could not assess crash risk relative to driver exposure (e.g., miles driven). Given the substantial volume of crashes occurring in inclement weather, the authors recommend enhanced driver education on safe practices in bad weather and the development of vehicle technologies to improve safety under these conditions.
Key finding
From 2010–2014, an average of 1.18 million U.S. police-reported crashes annually (21% of all crashes) occurred in adverse weather or slippery road conditions; except for fog, which had 2.55× the adjusted fatality rate per crash versus clear weather, adverse conditions were associated with lower crash severity per event (e.g., 47% fewer fatalities per crash on snow-covered roads vs. dry roads).
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.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- weather rain fog snow
- incidence prevalence
- demographic disparities
- fatality injury trends
- comparative international
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Empirical Findings: crash risk outcomes