Accident Active

CHP : Disabled tractor trailer and Severe traffic alert on CA-4 Eastbound and Westbound at San Joaquin County Line (Byron). All lanes blocked. Avoid the area.

A accident was reported on CA-4 W near Contra Costa on June 16, 2026 at 12:35 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Jun 16, 5:35 AM

Last Updated

6 minutes ago

Jun 16, 6:30 AM

Coordinates

37.8918, -121.5703

Update History

5 observations

CHP : Disabled tractor trailer and Severe traffic alert on CA-4 Eastbound and Westbound at San Joaquin County Line (Byron). All lanes blocked. Avoid the area. Jun 16, 6:30 AM

CHP : Disabled tractor trailer on CA-4 Eastbound and Westbound at San Joaquin County Line (Byron). All lanes blocked. Avoid the area. Jun 16, 6:00 AM

CHP : Disabled tractor trailer on CA-4 Westbound at San Joaquin County Line (Byron). Lane closed. Expect delays. Jun 16, 5:45 AM

CHP : Disabled tractor trailer on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Jun 16, 5:30 AM

CHP : Disabled tractor trailer on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Jun 16, 5:15 AM

Source: 511_sfbay · ID 511.org/1508857 First seen Jun 16, 2026 5:15 AM

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