Napa County, California,
Napa County crashes
An analysis of crashes reported to the California Highway Patrol, looking at when crashes happen, how the yearly total has changed, and how often someone under the influence of alcohol or drugs was involved.
crashes in Napa County,
crashes, or , injured or killed at least one person
crashes, or , involved someone under the influence of alcohol or drugs
people killed, and injured
Time of day and day of week
On weekends, crashes are spread more evenly from late morning to nighttime.
Crashes by hour and day of week
The midnight hour is slightly inflated: some crashes with an unknown time are recorded as 12:00 a.m.
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Crashes involving someone under the influence
Share of crashes involving someone under the influence
- Weekdays
- Weekends
- All crashes
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Crashes per year
Crashes per year
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Crash severity
Each crash is counted once, at its most severe outcome.
Crashes by most severe outcome
About the data
Records come from the California Crash Reporting System (CCRS), published by the California Highway Patrol on the California Open Data Portal. Statewide files for were loaded into PostgreSQL; filtered to Napa County; and cleaned and analyzed in SQL.
"Under the influence" means at least one party in the crash, whether a driver, passenger, or cyclist, was recorded as under the influence of alcohol or drugs.
Limitations
- These are crash counts, not rates. The data has no traffic volumes.
- Impairment is recorded by the officer at the scene, not confirmed by testing, and may be undercounted.
- is a partial year, and recent records may still be revised.