TIMS - Transportation Injury Mapping System

Overview

The DUI Crash Summary & Map tool highlights alcohol- and drug-related injury crashes across California. It combines a statewide trend dashboard with an interactive county map and detailed local summaries so users can track impaired-driving crash trends.

You can open the tool from the Crash Summaries menu or directly at DUI Crash Summary & Map Tool. Each visualization updates automatically as you change the filters along the top of the page.

Getting started

Choose whether you are analyzing alcohol-involved, drug-involved, or combined DUI crashes.
Select your preferred crash severity metric: total crashes, fatalities, or fatalities and serious injuries (FSI).
Adjust the year range if you need to focus on a shorter or longer window. The default range includes the five most recent years of finalized SWITRS data.
Use the tabs below the filters to move between statewide charts, the county map and table, and detailed local summaries.

Statewide trends

The first panel shows annual statewide totals for your selected filters starting in 1997. Three synchronized charts highlight crashes, fatalities, and FSI counts so you can spot statewide inflection points.

Line charts comparing statewide DUI crashes, fatalities, and FSI over time — Use the buttons below the charts to toggle between all crashes and selected alcohol-involved, drug-involved, or combined DUI trends.

Statewide County map and table

The map and table panels summarize how each county compares to the statewide picture. Both views respond to the same filters you configured above.

Interactive county map

Choropleth map of California counties colored by DUI crash percentage — The legend shows quartile-based color breaks so you can quickly identify outliers.

Choose whether the shading represents percentages or absolute counts by toggling the Show Percent checkbox.
Select a county to open a pop-up with annual trends and rate comparisons.
Switch the data variable (crashes, fatalities, or FSI) to explore severity differences.

Summary table by County

Table listing counties with DUI crash metrics — Use the pager controls to focus on the top 10, top 20, or all counties.

Sort by the column headers to surface counties with the largest burden.

County or city summary

The final panel delivers location-specific charts so you can brief partners or agencies on local conditions.

Select a county to see combined incorporated and unincorporated trends, or pick an individual city for jurisdiction-level details.
Review the annual line charts to compare your area to the statewide baseline.
Scan the pie charts and stacked summaries to see how crash, party, and victim numbers break down by impairment type.

Example jurisdiction charts showing DUI crashes over time — Charts update instantly as you switch between counties or cities.

Reminder

For county-wide totals, choose the county name with the All option. Pick Unincorporated to focus on county-maintained roadways only.

Key definitions

Alcohol-involved crash: Injury crash where at least one driver (PARTY_TYPE = 1) had a sobriety code of B, C, or D (PARTY_SOBRIETY IN ('B', 'C', 'D')), indicating alcohol involvement.
Drug-involved crash: Injury crash where a driver (PARTY_TYPE = 1) has a drug/physical condition code of E (PARTY_DRUG_PHYSICAL = 'E').
DUI crash: Any crash counted in either alcohol-involved or drug-involved categories.
FSI: The combined total of fatalities and serious injuries.

Definitions align with the underlying California Highway Patrol SWITRS coding guidance. When comparing to national figures, be aware that FARS metrics may differ.