Where do crashes happen most often on SR-138?

The short answer: From October 23, 2025 through October 22, 2026, the SR-138 corridor recorded 350 matching crash records. The largest recorded location category was Unincorporated with 349 matches. Among named cities, San Bernardino had the highest count with 1. This is a count of records, not an exposure-adjusted measure of danger. View the reproducible table or read the methodology and limitations.

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Corridor Heat Map

SR-138 crash-record density

Adjust the window from the profile start date. The map redraws to show only loaded mappable records inside that date range.

0
Plotted records in window
Profile starts Oct 23, 2025Showing Oct 23, 2025 to Oct 22, 2026
1 month from start3 months6 months9 monthsFull profile year
Window: Oct 23, 2025 to Oct 22, 2026
Loaded map records: 0 maximum client sample
Full profile count: 350 records
Loading crash coordinatesBlue record-onlyYellow injuryRed fatal
© OpenStreetMap contributors
Year-over-year records

How reported SR-138 crashes compare by year

Annual counts use the same road-matching method as this profile. The latest year may be incomplete if the source data has not reached year end.

2021 to 2026
Bars show reported crash-record counts, not risk rates or traffic-volume-adjusted danger.

Top Incident Locations along SR-138

Unincorporated349 crashes
San Bernardino1 crashes

Direction of Travel Split

265
Other/Unknown
46
E/B
33
W/B
3
S/B
3
N/B

Severity & Casualties Summary

3
People reported killed
268
Injuries (People)

Reported Lane Patterns

partial
37.1%
Lane data coverage
0
Anomalies (Lane > Total)

Most Frequent Recorded Lanes

lane ? / total 1315 records
lane ? / total 296 records
lane 2 / total 283 records
lane 1 / total 262 records

Sideswipe Context

Of the sideswipes with clear lane details, 12 crossed multiple reported lanes (lane-departure context), while 6 occurred within a single lane.

Note: Lane numbers are officer-reported (e.g. "Lane 1" is typically the fast lane). They are useful for local review but do not reflect verified road geometry.

Download the data

Locations with the most matching SR-138 records

Counts reflect the road labels and city fields recorded in the source data for this reporting window. They do not account for traffic volume, road miles, or time spent traveling.

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Top locations in matching SR-138 crash records
RankRecorded cityCrashesSerious or fatalPeople killed
1Unincorporated349233
2San Bernardino100
Methodology

How this corridor profile is produced

No applied canonical mapping exists for SR-138 yet, so this profile temporarily uses the legacy curated alias matcher against the officer-recorded primary-road label. The reporting window is 2025-10-23 through 2026-10-22. Source records come from the California Highway Patrol California Crash Reporting System.

Read the full methodology and privacy notes
Limitations

What the numbers cannot establish

  • Raw crash counts do not measure individual risk or identify the “most dangerous” segment.
  • Traffic volume, vehicle miles traveled, road length, construction, and enforcement exposure are not controlled here.
  • Road and city labels can be incomplete, inconsistent, or revised after publication.

Cite or reuse this profile

This is independent analysis of public records. Keep the reporting window, source, and methodology attached when reusing a figure.

Evidence for Zero. "SR-138 Highway Crash Records Profile." Updated Oct 22, 2026. https://crashes.meruai.co/california/roads/sr-138. Analysis of California Crash Reporting System public records.
Read the methodology