Accident Moderate Severity Resolved

CHP : Disabled tractor trailer on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on April 16, 2026 at 2:29 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Apr 15, 7:29 PM

Last Updated

6 months, 1 week ago

Apr 15, 7:30 PM

Resolved

Apr 16, 1:45 AM

Coordinates

37.8903, -121.5694

Update History

2 observations

CHP : Disabled tractor trailer on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Apr 15, 7:30 PM

CHP : Disabled tractor trailer on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Apr 15, 7:15 PM

Source: 511_sfbay · ID 511.org/1481867 First seen Apr 15, 2026 7:15 PM